You found that the unknown metal has a specific heat capacity close to, for example, that of silver (c=234J/(kg?K)). Let's compare silver to other known materials and see whether your results make sense. Imagine you have 1 kg of each of the substances listed below.
If the same amount of heat Q is added to each, which substance will undergo the largest change in temperature ?T? Assume that no substance experiences a phase change.
Answers
According to the given statement a. c= silver/ 234J(kg/K) > b. c= water/ 4190 J(kg/K) > c. c= glass/ 754J/(kg.K).
Why is heat capacity essential and what does it mean?The quantity of energy per unit mass needed to increase the temperature by one degree Celsius is known as the thermal inertia or specific heat. The ability to distinguish between two composite materials using specific heat can be useful in calculating the processing heats and volume of heat required.
Briefing:Since the heat produced by a substance's temperature change for a particular amount is determined by:
Q = mCpΔT
We may conclude that the greater the specified heat, the more the required energy since they are directly proportional because the specific heat is connected to the amount of energy needed to elevate the temperature of 1 kilogram of a substance by 1 °C. Additionally, since the heating value and the temperature change are inversely related, it follows that the greater the specialized heat, the less the temperature changes. Accordingly, we may rank the substances as follows:
a. c= silver/ 234J(kg/K) > b. c= water/ 4190 J(kg/K) > c. c= glass/ 754J/(kg.K)
Given that silver has the lowest specific heat, followed by water and then glass, it follows that silver will cause the greatest temperature change.
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Related Questions
A skateboarder travels on a horizontal surface with an initial velocity of 3.6 m/s toward the south and a constant acceleration of 1.8 m/s^2 toward the east. Let the x direction be eastward and the y direction be northward, and let the skateboarder be at the origin at t=0.
a. What is her x position at t=0.60s?
b. What is her y position at t=0.60s?
c. What is her x velocity component at t=0.60s?
d. What is her y velocity component at t=0.60s?
Answers
Answer:
a) The x-position of the skateboarder is 0.324 meters.
b) The y-position of the skateboarder is -2.16 meters.
c) The x-velocity of the skateboard is 1.08 meters per second.
d) The y-velocity of the skateboard is -3.6 meters per second.
Explanation:
a) The x-position of the skateboarder is determined by the following expression:
\(x(t) = x_{o} + v_{o,x}\cdot t + \frac{1}{2}\cdot a_{x} \cdot t^{2}\) (1)
Where:
\(x_{o}\) - Initial x-position, in meters.
\(v_{o,x}\) - Initial x-velocity, in meters per second.
\(t\) - Time, in seconds.
\(a_{x}\) - x-acceleration, in meters per second.
If we know that \(x_{o} = 0\,m\), \(v_{o,x} = 0\,\frac{m}{s}\), \(t = 0.60\,s\) and \(a_{x} = 1.8\,\frac{m}{s^{2}}\), then the x-position of the skateboarder is:
\(x(t) = 0\,m + \left(0\,\frac{m}{s} \right)\cdot (0.60\,s) + \frac{1}{2}\cdot \left(1.8\,\frac{m}{s^{2}} \right) \cdot (0.60\,s)^{2}\)
\(x(t) = 0.324\,m\)
The x-position of the skateboarder is 0.324 meters.
b) The y-position of the skateboarder is determined by the following expression:
\(y(t) = y_{o} + v_{o,y}\cdot t + \frac{1}{2}\cdot a_{y} \cdot t^{2}\) (2)
Where:
\(y_{o}\) - Initial y-position, in meters.
\(v_{o,y}\) - Initial y-velocity, in meters per second.
\(t\) - Time, in seconds.
\(a_{y}\) - y-acceleration, in meters per second.
If we know that \(y_{o} = 0\,m\), \(v_{o,y} = -3.6\,\frac{m}{s}\), \(t = 0.60\,s\) and \(a_{y} = 0\,\frac{m}{s^{2}}\), then the x-position of the skateboarder is:
\(y(t) = 0\,m + \left(-3.6\,\frac{m}{s} \right)\cdot (0.60\,s) + \frac{1}{2}\cdot \left(0\,\frac{m}{s^{2}}\right)\cdot (0.60\,s)^{2}\)
\(y(t) = -2.16\,m\)
The y-position of the skateboarder is -2.16 meters.
c) The x-velocity of the skateboarder (\(v_{x}\)), in meters per second, is calculated by this kinematic formula:
\(v_{x}(t) = v_{o,x} + a_{x}\cdot t\) (3)
If we know that \(v_{o,x} = 0\,\frac{m}{s}\), \(t = 0.60\,s\) and \(a_{x} = 1.8\,\frac{m}{s^{2}}\), then the x-velocity of the skateboarder is:
\(v_{x}(t) = \left(0\,\frac{m}{s} \right) + \left(1.8\,\frac{m}{s} \right)\cdot (0.60\,s)\)
\(v_{x}(t) = 1.08\,\frac{m}{s}\)
The x-velocity of the skateboard is 1.08 meters per second.
d) As the skateboarder has a constant y-velocity, then we have the following answer:
\(v_{y} = -3.6\,\frac{m}{s}\)
The y-velocity of the skateboard is -3.6 meters per second.
According to the article, what was the effect of elevation on the experimental group?
Answers
Answer:
Due to the effect of elevation on the experimental group the participants decided to try to help the research assistant who was having opening one of her files to finish the study. Schnall, Roper, and Fessler were able to conclude that happiness associated with a feeling of elevation can lead to more altruism or helping behaviors.
Explanation:
100 percent on edge
The effect of elevation on the experimental group was they show more urge of being altruistic and feeling happiness and satisfaction associated with elevation.
Altruism:
It is a practice in which a person help others without any selfishness, the person just want to help.
Witnessing someone's altruistic behavior, make other to feel good and a urge of being Altruistic, this is known as elevation.
After watching elevating Oprah video, the test group help the research assistant who was having trouble in opening file.
Therefore, the effect of elevation on the experimental group was they show more urge of being altruistic and feeling happiness and satisfaction associated with elevation.
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Answers
Answer:
B
Explanation:
Motion is movement, the teacher's movement is motion
What is the vector sum of a vector T~ given by 40 m, 30 degrees and a vector U~ given by 12
m, 225 degrees?
Answers
Hence, R = 28.97 m, 24.5 degrees is the vector sum of T and U.
Is a vector at 30 degrees?A vector's direction is frequently stated as a rotation of the vector's "tail" anticlockwise with respect to due East. In accordance with this practise, a vector having a direction of 30 degrees is a vector that has been anticlockwise rotated 30 degrees with respect to due east.
Let's begin by separating the components of the vector T:
T~ = 40 m, 30 degrees
T_x = 40 cos(30) = 34.64 m
T_y = 40 sin(30) = 20 m
Let's now decompose the vector U into its constituent parts:
U~ = 12 m, 225 degrees
U_x = 12 cos(225) = -8.49 m
U_y = 12 sin(225) = -8.49 m
It is possible to combine elements of the same type (x and y):
R_x = T_x + U_x = 34.64 m - 8.49 m = 26.15 m
R_y = T_y + U_y = 20 m - 8.49 m = 11.51 m
The Pythagorean theorem can be used to determine the size of the resulting vector R:
|R~| = sqrt(R_x² + R_y²) = sqrt((26.15 m)² + (11.51 m)²) = 28.97 m
The inverse tangent function can be used to determine the direction of the resulting vector R:
theta = tan⁻¹(R_y/R_x) = tan⁻¹(11.51 m/26.15 m) = 24.5 degree.
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If you are dividing an objects distance traveled by its speed, you are calculating its
Time of travel
Displacement
Momentum
Acceleration
Answers
If you are dividing an objects distance traveled by its speed, you are calculating its Time of travel.
What is Time of travel?
Time travel is the idea of moving between certain moments in time, similar to moving between various points in space by a person or an object, usually with the use of a fictitious machine called a time machine. The idea of time travel is well known in philosophy and literature, especially science fiction. H. G. Wells' 1895 book The Time Machine popularised the concept of a time machine. It is unknown whether going back in time is physically possible, and if it is, there may be causality issues that arise. It has been widely seen and is generally understood within the context of special relativity and general relativity to be possible to move through time in the opposite direction from how we typically perceive it.
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A 2.15-nC charged particle located at the origin is separated by a distance of 0.0690 m from a 3.78-nC charged particle located farther along the positive x axis. If the 2.15-nC particle is kept fixed at the origin, where along the positive x axis should the 3.78-nC particle be located so that the magnitude of the electrostatic force it experiences is twice as great as the magnitude of the electrostatic force it experiences at 0.0690 m?
Answers
The new distance of the 3.78 nC particle when the electrostatic force is doubled is 0.049 m.
What is the electrostatic force between the two particles?
The magnitude of the electrostatic force experienced by the 3.78 n C particle when it is 0.069 m from the 2.15 nC particle is calculated as follows;
F = kq₁q₂ / r²
where;
k is the Coulomb's constantq₁ is the magnitude of particle 1q₂ is the magnitude of particle 2r is the distance between the particlesF = ( 9 x 10⁹ x 2.15 x 10⁻⁹ x 3.78 x 10⁻⁹ ) / ( 0.069² )
F = 1.536 x 10⁻⁵ N
When this electrostatic force is doubled, the new distance of 3.78 nC particle from the 2.15 nC is calculated as;
r² = kq₁q₂ / 2F
r = √ ( kq₁q₂ / 2F )
r = √ [ ( 9 x 10⁹ x 2.15 x 10⁻⁹ x 3.78 x 10⁻⁹ ) / ( 2 x 1.536 x 10⁻⁵ ) ]
r = 0.049 m
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What fraction of the total kinetic energy is rotational for the following objects rolling without slipping on a horizontal sur- face? (a) a uniform solid cylinder; (b) a uniform sphere; (c) a thin- walled, hollow sphere; (d) a hollow cylinder with outer radius R and inner radius R>2.
Answers
The ratio of their rotational kinetic energies is 4/5 or 0.8.
Let's denote the mass and radius of the cylinder and sphere as "m" and "r", respectively. At the top of the incline, both objects have only potential energy, which is then converted to kinetic energy. At the bottom of the incline, both objects have both translational and rotational kinetic energy.
For a uniform solid cylinder, the rotational inertia is\(1/2 * m * r^2\). For a uniform sphere, the rotational inertia is\(2/5 * m * r^2\). Therefore, the ratio of their rotational kinetic energies is:
(rotational kinetic energy of sphere) / (rotational kinetic energy of cylinder)
\(= (2/5 * m * r^2 * (v/r)^2) / (1/2 * m * r^2 * (v/r)^2)\)
= (4/5)
Therefore, rotational kinetic energy of sphere is 80% of rotational kinetic energy of the cylinder at bottom of the incline.
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--The complete Question is, A uniform solid cylinder and a uniform sphere with the same mass and radius are released from rest at the top of an incline. They both roll without slipping down the incline and reach the bottom with the same translational speed. What is the ratio of their rotational kinetic energies at the bottom of the incline?--
The graph shows a car’s velocity over time, What is the car’s acceleration between 6 and 7 seconds
Answers
Based on the given graph of the car’s velocity over time, the car’s acceleration between 6 and 7 seconds is 0 m/s².
What is the acceleration of a body?The acceleration of a body is defined as the rate of change of velocity of a body with time.
Mathematically, the acceleration of a body is given below as follows:
Acceleration = change in velocity / change time
The change in the velocity of a body is given as follows:
Change in the velocity = Final velocity - initial velocity
A velocity-time graph is a graph that plots the velocity of a body against the time taken by the body to move. The slope of a velocity-time graph gives the acceleration of the body.
The acceleration of the car is calculated from the given velocity-time graph as follows:
Acceleration = (60 - 50) m/s / (7 - 6) s
Acceleration = 10 m/s²
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A uniform 140 g rod with length 57 cm rotates in a horizontal plane about a fixed, vertical, frictionless pin through its center. Two small 30 g beads are mounted on the rod such that they are able to slide without friction along its length. Initially the beads are held by catches at positions 11 cm on each sides of the center, at which time the system rotates at an angular speed of 23 rad/s. Suddenly, the catches are released and the small beads slide outward along the rod. Find the angular speed of the system at the instant the beads reach the ends of the rod. Answer in units of rad/s.
Answers
Answer:
The correct answer is "12 rad/s"
Explanation:
The given values are,
Mass of rod,
M = 140 g
i.e.,
= 0.14 kg
Length,
L = 57 cm
i.e.,
= 0.57 m
Mass of beads,
M = 30 g
i.e.,
= 0.03 kg
Angular speed,
r = 11 cm
i.e.,
= 0.11 m
Now,
The inertia of rods will be:
= \(\frac{1}{12}ML ^2\)
On substituting the values, we get
= \(\frac{1}{12}\times 0.14\times (0.57)^2\)
= \(0.0037905 \ kg-m^2\)
The inertia of beads will be:
= \(mr^2\)
On substituting the values, we get
= \(0.03\times (0.11)^2\)
= \(0.000726 \ kg-m^2\)
The total inertia will be:
= \(Inertia \ of \ rods+Inertia \ of \ beads\)
= \(0.0037905 + 0.000726\)
= \(0.0045165 \ kg-m^2\)
now,
The angular speed of the system will be:
⇒ \(L_1w_1=L_2w_2\)
On substituting the values in the above equation, we get
⇒ \(0.0045165\times 23 = (0.0037905 + (0.03\times 0.285^2)\times 2 )\times w_2\)
⇒ \(0.1038795 = 0.0037905 + (0.00243675\times 2 )\times w_2\)
⇒ \(w_2 = 12 \ rad/s\)
A car traveled a distance of 30 km in 20 minutes (1/3 hours). What was the
speed of the car?
A. 90 km/hr
OB. 60 km/hr
O C. 30 km/hr
D. 10 km/hr
Answers
A 0.26-kg stone is held 1.2 m above the top edge of a water well and then dropped into it. The well has a depth of 4.5 m. (a) Relative to the configuration with the stone at the top edge of the well, what is the gravitational potential energy of the stone−Earth system before the stone is released?
Answers
Complete Question
The
Answer:
a
\(E_r = 3.058 \ J\)
b
\(E_b = -11.466 \ J\)
c
\(\Delta E_n = -14.524 \ J\)
Explanation:
From the question we are told that
The mass of the stone is \(m_s = 0.26 \ kg\)
The height above the top of the water is \(h = 1.2 \ m\)
The depth of the well is \(d = 4.5 \ m\)
The gravitational potential of the stone before it was released is
\(E_r = mgh\)
substituting values
\(E_r = 0.26 * 9.8 * 1.2\)
\(E_r = 3.058 \ J\)
The gravitation potential of the stone when it reaches the bottom of the well is
\(E_b = mg(- d)\)
The negative shows that the potential energy of the stone as compared to the earth is reducing
substituting values
\(E_b = 0.26 * 9.8 *(- 4.5)\)
\(E_b = -11.466 \ J\)
The change in the systems gravitational potential is
\(\Delta E_n = E_b - E_r\)
substituting values
\(\Delta E_n = -11.466 - 3.058\)
\(\Delta E_n = -14.524 \ J\)
the kids are playing tug of war. what will cause one side to win the game
Answers
Answer:
more pressure towards one side
Explanation:
if Carol pulls very hard and molly pulls even harder molly will win because she is putting more pull force than Carol
I don’t understand this question. 9th, 10th, 11th, and 12th subpart questions, please.
Answers
The warm air over the beach rises while the cooler denser air rushes in due to the transfer of heat through the air by the convection process.
Thus, convection is the correct answer to the 9th question.
The heat travels from the marshmallow to the screwdriver which is in contact with the marshmallow. This process is the conduction process.
Thus, conduction is the correct answer to the 10th question.
The hair curler transfers the heat to the hair which is in contact with the curler.
This process of transfer of heat is known as the conduction process.
Thus, conduction is the correct answer to the 11th question.
The body of the person is in contact with the rock. Thus, the transfer of heat takes place due to conduction.
Thus, conduction is the correct answer to the 12th question.
What makes electromagnets useful for sorting metals in recycling centers?
O A. The current can be turned on to pick up items containing all
metals and turned off to drop them.
O B. The current can be turned off to pick up items containing all
metals and turned off to drop them.
O C. The current can be turned on to pick up items containing iron and
turned off to drop them.
D. The current can be turned off to pick up items containing iron and
turned on to drop them.
Answers
C
It is right because I took this and I got this answer correct
Crystal's class is studying parallel circuits. The teacher asks what will happen if one of the light bulbs break in a parallel circuit with three total light bulbs, as shown in the diagram.
Crystal says that both of the other light bulbs would go out if one bulb breaks. Is she correct? Why or why not?
A.Yes, Crystal is correct. The other two light bulbs would go out because the circuit would be broken.
B. No, Crystal is incorrect. The other two light bulbs would remain lit because their circuits would not be affected.
C. Yes, Crystal is correct. The other two light bulbs would go out because the current flowing through them would decrease.
D. No, Crystal is incorrect. The other two light bulbs would remain lit because the current flowing through them would increase.
Answers
D No, Crystal is incorrect. The other two light bulbs would remain lit because the current flowing through them would increase.
Parallel circuit
The sort of circuit you will likely see most frequently is the parallel circuit. In one manner or another, loads in power distribution networks are often linked in parallel with one another.
The terminals of each separate load device are connected to create a parallel circuit, which ensures that each component receives the same voltage.
In each branch, the voltage is the same.
Current can go via three different routes (branches), each of which travels from the negative terminal to the positive terminal.
In contrast to a series circuit, if any branch or component in a parallel circuit is opened, current still flows to the other devices in the circuit.
Voltage, current, and resistance have three essential interactions in parallel circuits.
Voltage
Each load resistor functions as a separate branch circuit in a parallel circuit, allowing each branch to "see" the whole supply voltage.
The voltage across each branch and the overall voltage of a parallel circuit are equal.
This connection may be stated as follows:
ET = E1 = E2 = E3…
Current
In a parallel circuit, current can travel through many paths. The quantity of load resistors linked in parallel determines the number of current routes.
Resistance
When more resistances are linked in series, the overall circuit resistance decreases as a result.
Any individual resistance value in a parallel circuit has a lower value than the net resistance.
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What happens to liquid nitrogen when it gets warmer?
Answers
Answer:
see below
Explanation:
It boils (or evaporates) and becomes gaseous nitrogen like water turns to water vapor when it gets warm enough
A solid cube just gets completely immersed in water when
a 0.5 kg mass is placed on it. If the mass is removed, the cube
is 5 cm above the water level. What is the length of each side of the cube?
(Density of water =1 kg/L
A. 8 cm
B. 10 cm
C. 20 cm
D. 6 cm
If possible can you also explain the answer.
Thank you!
Answers
Answer:
B. 10 cm
x^3 = 1 L
1 L = 1000 cm^3 (since 1 L = 1000 cm^3)
x^3 = 1000 cm^3
A 2400 kg car traveling at 25 m/s hits a wall and is brought to rest in 0.5 second. What is the magnitude
of the average force acting on the car to bring it to rest?
Answers
A dryer uses electrical energy to spin a drum and produce heat. It uses 220 V of an electric charge and 50 A of electric current. What is the dryer power?
Answers
The power used by the dryer to spin the drum and produce heat is 11000 Watts.
What is the power of the dryer?Power is simply the quantity of energy transferred per unit time.
This is expressed as;
P = v × I
Where v is voltage and I is current.
Given that;
Voltage v = 220VCurrent I = 50APower P = ?Plug the given values into the above formula and solve for P.
P = v × I
P = 220V × 50A
P = 11000 Watts
Therefore, the power used by the dry is 11000 Watts.
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A cell of inter resistance of 0.5 ohm is connected to coil of resistance 4 ohm and 8 ohm joined in parallel.If there is current of 2A in 8 ohm,find the emf of the cell.
Answers
A cell of inter resistance of 0.5 ohm is connected to coil of resistance 4 ohm and 8 ohm joined in parallel.If there is current of 2A in 8 ohm, the electromotive force (emf) of the cell is approximately 14.5 volts.
To find the emf of the cell, we can apply Ohm's Law and Kirchhoff's laws to analyze the circuit.
Given:
Resistance of the coil, R1 = 4 ohm
Resistance of the other resistor, R2 = 8 ohm
Current passing through the 8-ohm resistor, I = 2A
First, let's analyze the parallel combination of the 4-ohm and 8-ohm resistors.
The total resistance of two resistors in parallel can be calculated using the formula:
1/Rp = 1/R1 + 1/R2
Substituting the given values, we have:
1/Rp = 1/4 + 1/8
1/Rp = 2/8 + 1/8
1/Rp = 3/8
Rp = 8/3 ohm
Now, let's consider the total resistance in the circuit, which includes the internal resistance of the cell (0.5 ohm) and the parallel combination of the resistors (8/3 ohm).
R_total = R_internal + Rp
R_total = 0.5 + 8/3
R_total = 1.833 ohm
Now, we can find the emf of the cell using Ohm's Law:
emf = I * R_total
emf = 2 * 1.833
emf ≈ 3.667 volts
Therefore, the emf of the cell is approximately 3.667 volts.
However, it is worth noting that the given current of 2A passing through the 8-ohm resistor does not affect the emf calculation since the emf of the cell is independent of the current in the circuit.
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2. For electric circuit shown in Figure find currents in each resistor.
Answers
The current flowing in the 2Ω and 1Ω is 1.14 A and the current flowing in the 3Ω and 4Ω is 0.286 A.
What is the current flowing in each resistor?The value of the current in each resistor is calculated by applying Kirchoff voltage law as follows;
The total voltage in loop 1 is calculated as;
2 + 4 - I₁R₁ - (I₁ - I₂)R₂ - I₁R₃ = 0
6 - 2I₁ - 3(I₁ - I₂) - 1₁ = 0
The current flowing in loop 2 is calculated as;
I = V/R
I₂ = ( 6 V - 4 V ) / (3 + 4)
I₂ = 0.286 A
The value of the current flowing in loop 1 is calculated as;
6 - 2I₁ - 3(I₁ - I₂) - 1₁ = 0
6 - 2I₁ - 3(I₁ - 0.286) - 1₁ = 0
6 - 3I₁ - 3₁ + 0.858 = 0
-6I₁ = -6.858
I₁ = 6.858 / 6
I₁ = 1.14 A
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An aeroplane is circling above an airport in a horizontal circle at a speed of 400 kmh-1.The banking angle of the wings is 20.What is the radius of the circular path?
Answers
Answer: the radius of the circular path is approximately 1637.58 meters.
Explanation:
The centripetal force acting on the airplane is provided by the component of the gravitational force that acts towards the center of the circular path. This component is given by:
F_c = m * g * tan(banking angle)
Where:
F_c is the centripetal force
m is the mass of the airplane
g is the acceleration due to gravity
tan(banking angle) is the tangent of the banking angle
Now, the centripetal force is also given by the formula:
F_c = (m * v^2) / r
Where:
v is the speed of the airplane
r is the radius of the circular path
Equating the two expressions for F_c, we get:
(m * g * tan(banking angle)) = (m * v^2) / r
Canceling out the mass (m) on both sides of the equation, we have:
g * tan(banking angle) = v^2 / r
Solving for r, we get:
r = (v^2) / (g * tan(banking angle))
Substituting the given values:
v = 400 km/h = 400,000 m/h
g = 9.8 m/s^2
banking angle = 20°
Converting the speed to m/s:
v = 400,000 m/h * (1/3600) h/s = 111.11 m/s
Converting the banking angle to radians:
banking angle = 20° * (π/180) rad/° = 0.3491 rad
Now, substituting the values into the formula:
r = (111.11^2) / (9.8 * tan(0.3491))
r ≈ 1637.58 meters
Therefore, the radius of the circular path is approximately 1637.58 meters.
Vacillate the change in the. Kinetic energy KE of the bottle when the mass is increased use the formula KE=1/2 mv2 where m is the mass and v is the speed
Answers
When the mass is 0.125 kg, the kinetic energy is 1 J
When the mass is 0.250 kg, the kinetic energy is 2 J.
When the mass is 0.375 kg, the kinetic energy is 3 J.
When the mass is 0.500 kg, the kinetic energy is 4 J.
What is the kinetic energy of the bottle?
The kinetic energy of the bottle is the energy possessed by the bottle due to its mass and motion.
K.E = ¹/₂mv²
where;
m is the mass of the bottlev is the speed of the bottleWhen the mass is 0.125 kg, the kinetic energy is calculated as;
K.E = ¹/₂ x 0.125 kg x ( 4 m/s )²
K.E = 1 J
When the mass is 0.250 kg, the kinetic energy is calculated as;
K.E = ¹/₂ x 0.25 kg x ( 4 m/s )²
K.E = 2 J
When the mass is 0.375 kg, the kinetic energy is calculated as;
K.E = ¹/₂ x 0.375 kg x ( 4 m/s )²
K.E = 3 J
When the mass is 0.500 kg, the kinetic energy is calculated as;
K.E = ¹/₂ x 0.5 kg x ( 4 m/s )²
K.E = 4 J
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If
you push on a box but the box moves backward, you have done
work.
Answer here
Answers
Choose all true statements Choose all true statements Resistors connected in parallel will always have the same potential difference across all of them. When combining multiple resistors in series, the equivalent resistance is less than any of the individual resistanes. Resistors connected in series will always have the same current flowing through all of them. Resistors connected in series will always have the same potential difference across all of them. Resistors connected in parallel will always have the same current flowing through all of them. When combining multiple resistors in parallel, the equivalent resistance is less than any of the individual resistanes.
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Answer:
The answer is " Option F, Option C, and Option D".
Explanation:
In the question the three choices were correct which can be defined as follows:
Its equivalent resistance is below any load resistors while integrating multiple resistors in parallel.The connected sequence resistances will still have the same fluid power.Simultaneously connected resistances will always have the same electrical potential between them at all.
A student wishes to construct a mass-spring system that will oscillate with the same frequency as a swinging pendulum with a period of 3.45 S. The student has a spring with a spring constant of 72.0 N/m. What mass should the student use to construct the mass-spring system?
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Answer:
21.73 kg
Explanation:
Applying,
T = 2π√(m/k)............... Equation 1
Where T = period, m = mass on the spring, k = spring constant, π = pie.
make m the subject of the equation
m = T²k/4π²................. Equation 2
From the question,
Given: T = 3.45 s, k = 72.0 N/m, π = 3.14
Substitute these values into equation 2
m = (3.45²×72)/(4×3.14²)
m = 21.73 kg.
Hence the mass should be 21.73 kg
Given the two displacement
D=(6i +3j -k )
E=(4i - 5j +8k)
Find the magnitude of displacement 2D -E
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The approximate value of the magnitude of the displacement vector 2D - E is roughly 16.88.
How to find the magnitude of the displacementIn order to find out the magnitude of the displacement vector 2D - E, you can use these steps:
multiplying D by 2. this would result to
12i + 6j - 2k
subtracting E from 2D. this would result to
8i + 11j - 10k
The calculation of Step three entails computing the magnitude of 2D - E where |V| = sqrt(Vi^2 + Vj^2 + Vk^2)
|2D - E| = sqrt((8^2) + (11^2) + (-10^2))
|2D - E| = sqrt(64 + 121 + 100)
|2D - E| = sqrt(285),
|2D - E| = 16.88 when rounded off to two decimal places.
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A uniform conducting rod is fixed and allowed to pivot about its center, as shown in the figure. A uniform, positively charged conducting sphere is brought near the upper end of the rod, and the rod rotates clockwise. The rod is then reset to the position shown. The sphere is then brought to point X near the lower end of the rod, and the rod rotates counterclockwise. Which of the following could be true of the charge on the rod? Select two answers.
The rod is positively charged.
The rod is uncharged.
The rod has no net charge until the sphere is brought near it.
The rod is negatively charged.
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The correct answers are: a) The rod is negatively charged and d) The rod is positively charged.
When the sphere is brought near the upper end of the rod and the rod rotates clockwise, this indicates that the sphere has a positive charge.
When the sphere is brought to point X near the lower end of the rod and the rod rotates counterclockwise, this also indicates that the sphere has a positive charge.
The other two options are not correct. The rod is not uncharged, because it has a charge when the sphere is brought near it. The rod also does not have no net charge until the sphere is brought near it, because it has a charge when the sphere is brought near it.
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Read this excerpt from Beowulf by an anonymous Anglo-Saxon poet.
Hrothgar, king of the Danes, or Scyldings, builds a great mead-hall, or palace, in which he hopes to feast his liegemen and to give them presents.
Which word best provides a context clue to the meaning of mead-hall?
palace
liegemen
feast
king
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Answer:
it is a i
Explanation:
i took the quiz on edge 2020
Palace word best provides a context clue to the meaning of mead-hall. So, the correct option is A.
What is the Palace?The royal residence, as well as occasionally a place of government or worship, is referred to as a palace. The Pontifical Hill in Rome, where the Ancient romans built their palaces, is whence the word was from.
A palace should be distinguished from a fortress, which was formerly any fortified residence, as a construction. A palace is a location with a regal and imposing structure that serves as a stately home such as a president, ruler, or leader's official residence.
Many old palaces have been turned into museums that depict what life was like for the king and aristocracy at the time they were erected. The context information provided by Palace term in the aforementioned example sheds light on the definition of mead-hall.
Therefore, the correct option is A.
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A car travels 60 miles due West first then turns back and travels 120 miles due East in 3 hours. What is...
a) the distance traveled by car?
b) the displacement of the car?
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Answer:
A. 180 milesB. 60 milesExplanation:
In this problem, we are required to solve for the total distance that the car travelled. and the displacement
A) the distance travelled by car
this can be gotten by summing all the distances the car has travelled.
i,e total distance= 60 miles+120 miles
total distance= 180 miles
B) the displacement of the car
the displacement can be gotten by subtracting the final distance from the initial distance
final distance = 120 miles
initial distance= 60 miles
displacement= 120-60= 60 miles