Answers
Answer:
about 42.35 m/s
Explanation:
Use the equation for accelerated motion (g), and with zero initial velocity that doesn't include time:
\(v_f^2=v_i^2+2\,a\,\Delta x\)
which for our case would reduce to:
\(v_f^2=v_i^2+2\,a\,\Delta x\\v_f^2=0+2\,9.8\,(91.5)\\v_f^2= 1793.4\\v_f=\sqrt{1793.4} \\v_f \approx 42.35\)
then the velocity just before hitting would be about 42.35 m/s
Related Questions
Which
type of energy transformation is taking place when natural gas is used to heat water?
O chemical energy into thermal energy
thermal energy into mechanical energy
mechanical energy into electromagnetic energy
electromagnetic energy into chemical energy
Answers
Answer:
O chemical energy into thermal energy
Hope this helped!!
Answer:
chemical energy into thermal energy
Explanation:
what is the magnification of a real image if the image is 10.0 cm from a mirror and the object is 50.0 cm from the mirror
Answers
The magnitude of the magnification indicates the size change of the image relative to the object. In this case, the magnitude is 0.2, indicating that the image is one-fifth the size of the object.
To determine the magnification of a real image formed by a mirror, we can use the magnification formula:
Magnification (m) = - (Image distance) / (Object distance)
Given:
Image distance (di) = 10.0 cm
Object distance (do) = 50.0 cm
Substituting the given values into the formula, we have:
m = \(- (10.0 cm) / (50.0 cm)\)
Simplifying the equation, we find:
m = -0.2
The negative sign indicates that the real image formed by the mirror is inverted compared to the object.
Therefore, the magnification of the real image is -0.2.
For more such questions on magnification.
https://brainly.com/question/29306986
#SPJ8
12
Select the correct answer.
What creates an electric force field that moves electrons through a circuit?
ОА.
energy source
B.
load
O c.
metal wires
OD.
resistance
Answers
Answer:
A
Explanation:
Discuss the circuits.
Name all the
components. What
will happen to bulb
B1 if the bulb B2 is
replaced with
connecting wire in
each circuit?
Answers
The series circuit has components connected in a sequence, while the parallel circuit has components connected in different branches. If bulb B2 is replaced with a wire in the series circuit, bulb B1 will not light up, while in a parallel circuit, it will still light up.
Circuits are basically the pathways that allow the flow of electric current. These circuits have different components. In this context, there are two circuits, the series circuit, and the parallel circuit. The series circuit has bulbs connected in a sequence where current flows through each bulb in turn. In contrast, the parallel circuit has bulbs connected to different branches. The current flows through each bulb separately.In a series circuit, the components are a power source, resistors, and wires. A power source can be a battery or a generator that is connected in a sequence with resistors and wires. The bulbs B1 and B2 are connected in series. If bulb B2 is replaced with a connecting wire, then the circuit will become incomplete, and bulb B1 will not light up. This is because in a series circuit, if one component is disconnected, the entire circuit becomes open, and the current stops flowing. Thus, if bulb B2 is replaced with a wire, the current will bypass the bulb, and the circuit will become incomplete. In a parallel circuit, the components are a power source, resistors, and branches. The bulbs B1 and B2 are connected in parallel. If bulb B2 is replaced with a connecting wire, the circuit will still work. This is because in a parallel circuit, each bulb has its branch, and the current flows through each bulb separately. Thus, if bulb B2 is replaced with a wire, the current will still flow through bulb B1, and it will light up.For more questions on the series circuit
https://brainly.com/question/19865219
#SPJ8
Question below in photo!! Please answer! Will mark BRAINLIEST! ⬇⬇⬇⬇⬇⬇⬇
Answers
Answer:
it shows the Crest of the wave
Explanation: makes the most sense
The diagram shows two sets of vectors that result in a
single vector.
R
100 m
200 m
250 m
50 m
What are the first two steps for finding the magnitude of
the resultant vector?
find the square of the first horizontal vector and the
square root of the first vertical vector
O find the square root of the first horizontal vector and
the square root of the second horizontal vector
O find the sum of the two horizontal vectors and the
sum of the two vertical vectors
O find the difference between the two horizontal vectors
and the difference between the two vertical vectors
Answers
The magnitude of the resultant vector is obtained by finding the sum of two horizontal vectors and the sum of two vertical vectors. Thus, option C is correct.
The resultant vector is the single vector that has the same effect in the number of vectors collectively produced. The resultant vector in the horizontal and vertical direction is obtained by drawing a diagonal and hence by using the Pythagoras theorem.
To find resultant vector is obtained by finding the sum of two horizontal vectors and vertical vectors and then using the Pythagoras theorem.
Thus, the ideal solution is option C.
To know more about Pythagoras' theorem:
https://brainly.com/question/343682
#SPJ1
What would most likely occur if an earthquake occurred near a dry, steep slope? Why?
Answers
Answer: There would probably be a land slide.
Explanation: The earthquake would break up the dry steep hill and then it would break up and cause a land slide.
This is my first answer! :)
An 18 kg block moving at 6 m/s has a kinetic energy of
Answers
Erica is working in the lab. She wants to remove the fine dust particles suspended in a sample of oil. Which method is she most likely to u
Answers
Answer: Option A is your answer
Explanation:
Every household has at least one refrigerator, many hotels have ice makers. you may have wondered how much heat energy a refrigerator / ice maker takes
from water to make ice. Compute the amount of energy an
ice maker extracts from 200g of water at 34°c to manufacture ice at 0°c.
Answers
Answer:
1.heading
2.photo
3.boldface text
4.caption
5.bulleted list
Explanation:
you welcome
L 1.1.4 Quiz: Wave Interactions
Question 2 of 10
A light wave traveling through air passes into a new medium. What can result
when some of the wave's energy is absorbed by the new medium?
A. The wave's amplitude increases.
B. The wave's energy decreases.
C. The medium's energy decreases.
O D. The medium's mass increases.
Answers
Answer:
Answer B is correct: The wave's energy decreases.
Explanation:
When some of the wave's energy is absorbed by the new medium, the wave's energy decreases. Hence, option (B) is correct.
What is wave?A wave is an energetic disturbance in a medium that doesn't include any net particle motion. Elastic deformation, a change in pressure, an electric or magnetic intensity, an electric potential, or a change in temperature are a few examples.
When light wave transmits from one medium to another medium, some amount of energy of the light wave is absorbed by the new medium. Then the transmitted light wave travels with remaining energy. So, the energy of the wave decreases in this case. Hence, option(B) is correct.
To find more about wave, refer the link:
https://brainly.com/question/3639648
#SPJ5
An object that weighs 20 N encounters 20 N of air resistance. What is the acceleration in the y direction?
Answers
Answer:
Explanation:
F=ma.
a=m÷fcos 0
Are we within Earth's Roche limit?
Answers
Answer:
Yes
Explanation:
Within the Earths Roche is our mass and body.
Calculate the force exerted on the the window of an underwater vehicle at a depth of 27.5 m where in the window is circular and has a diameter of 35.0 cm. Density of water is 1000kg/m^3
indicate solution
Answers
Answer:
Pr abs = (101.3+9.806*27.5) = 371 kPa (kN/m^2) .. or 3.71*10^5 Pa
F = Pr abs*A = 371 kN/m^2*(0.7854*0.35^3 m^2) = 35.7 kN..or 3.57*10^4 N
Explanation:
To decrease the amount of force required to do work, you can increase the distances applied. True or False
Answers
Answer:
True
Explanation:
Three vectors are shown in this figure. Their respective moduli are A = 4.00m.B = 3, 20m and C = 2.70mCalculate 2.00 A - B + 1.30 CExpress your answer according toa) Unit vectorsb) The modulus and orientation with respect to the positive part of the x-axis
Answers
Given that,
Modulus of vector A=4.00
The angle made by the vector A with the y axis, θ₁=33.0°
The modulus of vector B=3.20 m
The angle made by the vector B with the x-axis is θ₂=40.0+90.0=130°
The modulus of the vector C=2.70 m
The angle made by the vector C with x-axis θ₃=-90°
The x and y components of the vector can be written as
\(\begin{gathered} x=r\cos \theta \\ y=r\sin \theta \end{gathered}\)Where r is the magnitude (or modulus) of the vector and θ is the angle made by the vector.
Or a vector, in cartesian coordinates, can be written as,
\(R=r\cos \theta\hat{\text{i}}+r\sin \theta\hat{j}\)Therefore, vector A is cartesian coordinates is
\(\begin{gathered} \vec{A}=4.00\cos 33^{\circ}\hat{i}+4.00\sin 33.0^{\circ}\hat{j} \\ =3.35\hat{i}+2.18\hat{j} \end{gathered}\)And the vector B is
\(\begin{gathered} \vec{B}=3.20\cos (130^{\circ})\hat{i}+3.20\sin (130^{\circ})\hat{j} \\ =-2.06\hat{i}+2.45\hat{j} \end{gathered}\)And vector C is given by,
\(\begin{gathered} \vec{C}=2.70\cos (-90^{\circ})\hat{i}+2.70\sin (-90^{\circ})\hat{j} \\ =-2.7\hat{j} \end{gathered}\)The given equation is
\(2.00\vec{A}-\vec{B}+1.30\vec{C}\)Let this represents a vector V
On substituting the known values,
\(\begin{gathered} \vec{V}=2.00\vec{A}-\vec{B}+1.30\vec{C} \\ =2.00\times(3.35\hat{i}+2.18\hat{j})-(-2.06\hat{i}+2.45\hat{j)}+1.30(-2.7\hat{j}) \\ =8.76\hat{i}-1.6\hat{j} \end{gathered}\)(a) This is the representation with the unit vectors, where i and j are the unit vectors along the x-axis and y-axis respectively.
\(\vec{V}=8.76\hat{i}-1.6\hat{j}\)b) The modulus of any vector is the square root of the sum of the squares of its components.
That is, the magnitude of the vector V is
\(\begin{gathered} V=\sqrt[]{8.76^2+(-1.6)^2} \\ =8.90\text{ m} \end{gathered}\)The angle of this vector with the x-axis is given by
\(\begin{gathered} \phi=\tan ^{-1}(\frac{-1.6}{8.75}) \\ =-10.36^{\circ}^{} \end{gathered}\)The negative sign indicates that the vector is below the positive x-axis
Therefore the modulus of the resultant of the above equation is 8.90 m and its angle with the positive x-axis is -10.36°
2. A parallel-plate capacitor has a capacitance of C. If the area of the plates is doubled and
the distance between the plates is doubled, what is the new capacitance?
A) C/4
B) C/2
C)C
D) 4C
Answers
(C)
Explanation:
The capacitance C of a parallel plate capacitor is given by
\(C = \epsilon_0 \dfrac{A}{d}\)
Let C' be the new capacitance where the area and the plate separation distance are doubled. This gives us
\(C' = \epsilon_0\dfrac{A'}{d'} = \epsilon_0\left(\dfrac{2A}{2d}\right) = \epsilon_0 \dfrac{A}{d} = C\)
Nami conducts an investigation on plants. She places a grow light on a timer to give the plants different amounts of light to see if this would affect their growth. Which term describes the amount of light in this investigation?
Answers
Answer:
It is independent variable
Explanation:
Answer:
D!!!!!
Explanation:
edge 2021!
The magnitude of vector A is 9.4 units, and it points in the +x-direction, while a second vector B points in the +y-direction.
(a) If the vector A + B points 54° counterclockwise from the +x-direction, what is the magnitude of B? __?__ units
(b) What is the magnitude of A + B? __?___ units
Answers
The magnitude of B be 11.56 unit and the magnitude of A + B is 14.90 unit.
What is vector quantity?Physical quantities that exhibit both magnitude and direction are referred to as vector quantities. As an illustration, consider displacement, force, torque, momentum, acceleration, and velocity.
Given that:
The magnitude of vector A is 9.4 units, and it points in the +x-direction, while a second vector B points in the +y-direction.
Let the magnitude of vector B is x unit.
So, angle of the vector A + B be = tan⁻¹(x/8.4)
a) according to the question:
tan⁻¹(x/8.4) = 54°
⇒ x = 8.4 tan 54° = 11.56 unit.
So, the magnitude of B be 11.56 unit.
b) Hence, the magnitude of A + B is = √(9.4² + 11.56²) unit = 14.90 unit.
Learn more about vector here:
https://brainly.com/question/29740341
#SPJ1
PLEASE ANSWERRRRR
a) A microwave oven that draws 0.8 kWh is used for one hour. At a cost of 7.5 cents per kWh, what is the cost of the microwave’s electrical energy consumption?
b) What is the cost for the microwave if it is used one day for 20 min?
(c) What is the cost of using the microwave for 20 min a day for a month of 30 days?
Answers
a) A microwave oven that draws 0.8 kWh is used for one hour. At a cost of 7.5 cents per kWh, then the cost of the microwave’s electrical energy consumption is 7.5 cents per kWh.
b) the cost for the microwave if it is used one day for 20 min is 1.98 cents.
(c) the cost of using the microwave for 20 min a day for a month of 30 days is 59.4 cents.
Given,
Energy consumption of microwave = 0.8 kWh
cost = 7.5 cents/kWh
20 min = 0.33hr
Energy consumption in 20 min = 0.8 kWh × 0.33 = 0.26 kWh.
cost for 20= 0.26 kWh × 7.5 cents/kWh = 1.98 cents
cost for 30 days,
1.98 cents × 30 days = 59.4 cents.
To know more about microwave :
https://brainly.com/question/15708046
#SPJ1.
One of the first____detectors was the satellite Copernicus?
ultraviolet
gamma ray infrared
x-ray
Answers
One of the first ultraviolet and X-ray detectors was the satellite Copernicus.
The largest and most complex space observatory of its time, the Copernicus satellite was launched by NASA on August 21, 1972 from Launch Facility 36B, now located at Space Force Station Cape Canaveral, Florida.
Copernicus was probably NASA's first multi-wavelength observatory, with the largest ultraviolet telescope ever orbited and his four her X-ray sensors arranged side-by-side.
It can therefore be considered a precursor to modern space telescopes, such as NASA's Neil Gehrels Swift Observatory, which use visible, ultraviolet and X-ray radiation to monitor the sky.
Copernicus ceased activity in 1981, but has provided UV and X-ray measurements for 8.25 years. It has lost its role at the forefront of space astronomy as more advanced observatories such as Einstein and the International Ultraviolet Explorer have emerged.
Learn more about Copernicus satellite here : https://brainly.com/question/9751231
#SPJ9
A cheetah can accelerate from rest to 25.0 m/s in 6.22 s. What is the cheetah's average speed for the first 3.11 s of its sprint
Answers
Answer:
18.75m/sExplanation:
Given data
initial speed ,u= o m/s
final speed v= 25 m/s
time t= 3.11 seconds
Applying the first equation of motion we have
\(v= u+at\\\\v-u=at\\\\a= \frac{v-u}{t} \\\\a= \frac{25-0}{6.22} \\\\a= 4.02 m/s^2\)
Also applying \(v=u+at\) with initial speed set at 0, we can also find speed at 3.11 seconds
\(v=0+4.02*3.11\\v= 12.50 m/s\)
Hence the average speed in the first 3.11 seconds is
\(\bar v= \frac{v}{2} \\\\\bar v=\frac{ 12.50}{2} \\\\ \bar v= 6.25 m/s\)
Applying the expression \(\bar v=\bar u+at\) we can now fing the average speed in the second 3.11 second
\(\bar v=\bar u+at\\\\ \bar v=6.25+4.02*3.11\\\\ \bar v=18.75m/s\)
03.03 LC)
The refraction of a sound wave occurs when the sound wave
stops at a boundary between media
bounces off the boundary between media
bends as it passes through the boundary between media
changes frequency after it passes through the boundary between media
Answers
The refraction of a sound wave occurs when the sound wave bends as it passes through the boundary between media. Refraction occurs when there is a difference in the speed of sound waves in two different media.
The bending of the sound wave occurs because the speed of sound changes as it passes from one medium to another. The amount of bending depends on the angle of incidence and the difference in speed between the two media. If the speed of sound is higher in the second medium than the first, then the wave bends away from the normal. If the speed of sound is lower in the second medium than the first, then the wave bends towards the normal. If the sound wave is incident perpendicular to the boundary, then there is no bending of the wave and no refraction occurs. Refraction of sound waves is an important phenomenon in our daily lives. It is the reason why we can hear sound around corners or why we can hear someone talking in another room even if the door is closed. The refraction of sound waves is also used in medical imaging, such as in ultrasound, where the sound waves are refracted as they pass through different tissues in the body.For more such questions on sound wave, click on:
https://brainly.com/question/16093793
#SPJ8
A cat that weighs 4 kilograms is moving at a velocity of 1 m/s. What is the kinetic energy?
Answers
The kinetic energy of the cat is 2 joules (J).
The kinetic energy of an object can be calculated using the formula KE = 1/2 * mass * velocity^2.
The kinetic energy of an object can be calculated using the formula:
Kinetic Energy (KE) = 0.5 * mass * velocity^2
In this case, the mass of the cat is 4 kilograms, and its velocity is 1 m/s. Plugging these values into the formula:
KE = 0.5 * 4 kg * (1 m/s)^2
Simplifying the equation:
KE = 0.5 * 4 kg * 1 m^2/s^2
KE = 0.5 * 4 kg * 1
KE = 2 kg
Therefore, the kinetic energy of the cat is 2 joules (J).
Kinetic energy is the energy possessed by an object due to its motion. In this case, the cat's kinetic energy is determined by its mass and velocity. The formula for kinetic energy demonstrates that it is directly proportional to the mass and square of the velocity. As the mass increases, the kinetic energy also increases. Similarly, as the velocity increases, the kinetic energy increases exponentially.
In this example, the cat's kinetic energy is relatively low due to its mass and velocity values. If the cat were moving at a higher velocity or had a greater mass, the kinetic energy would be significantly higher. Kinetic energy is an important concept in understanding the energy associated with moving objects and is utilized in various fields such as physics, engineering, and sports science.
for more such questions on kinetic
https://brainly.com/question/8101588
#SPJ8
Sample Response: Yes, his graph is correct because it shows that as the average kinetic energy increases, so does the temperature. This is called a direct relationship. What did you include in your response? Check all that apply. As average kinetic energy increases, temperature also increases. The graph shows a direct relationship between average kinetic energy and temperature.
Answers
The graph will be correct, if it shows a direct relationship between average kinetic energy and temperature of the gas molecules.
What is average kinetic energy?The average kinetic energy of a gas molecule is the energy possesed by the gas due to its relative motion.
Average kinetic energy of gas molecules has a direct relationship with temperature of the gas molecules. As the gas temperature increases, the kinetic energy of the gas increases and consequently, the speed of the gas increases as well.
Thus, the graph will be correct, if it shows a direct relationship between average kinetic energy and temperature of the gas molecules.
Learn more about average kinetic energy here: https://brainly.com/question/9078768
Answer:
Select both
Explanation:
You included all needed information
In the diagram, R₁ = 40.0 , R2= 25.4 , and R3 = 70.8 . What is the equivalent resistance of the group?
Answers
According to the diagram the equivalent resistance of the group is
40.05 ohms
How to find the equivalent resistanceThe equivalent resistance is calculated by investigating the diagram to note that R2 and R3 are in parallel and both are in series to R1
Resistors in parallel is solved by
Resistors in parallel = 1/25.4 + 1/70.8
Resistors in parallel = 0.0535 ohms
Equivalent resistance
Equivalent resistance = Resistors in parallel + Resistor in series
Equivalent resistance = 0.0535 + 40
Equivalent resistance = 40.0535
Learn more about equivalent resistance at
https://brainly.com/question/30901006
#SPJ1
A thin uniform cylindrical turntable of radius 2.3 m and mass 22 kg rotates in a horizontal plane with an initial angular speed of 7.3 rad/s. The turntable bearing is frictionless. A clump of clay of mass 8.7 kg is dropped onto the turntable and sticks at a point 1.5 m from the point of rotation. Treat the clay as a point mass. Find the angular speed of the clay and turntable. Answer in units of rad/s.
Answers
Answer:
ω = 5.5 rad/s
Explanation:
Assuming no external torques present during the instant that the clump of clay is dropped on the turntable, total angular momentum must be conserved.The angular momentum of a rotating rigid body, can be expressed as follows:\(L = I * \omega (1)\)
where I = moment of inertia regarding the axis of rotation, and ω =
angular speed of the rotating body.
Since the angular momentum must keep constant, this means that it must be satisfied the following equality:\(L_{o} = L_{f} (2)\)
where L₀ = I₀ * ω₀, Lf = If * ωf.
I₀ is the moment of inertia of a solid disk rotating around an axis
passing through its center, as follows:
\(I_{o} =\frac{1}{2} * m* r^{2} = \frac{1}{2} * 22 kg*(2.3m)^{2} = 58.2 kgm2 (3)\)
If, is the moment of inertia after dropping the clump of clay, which adds
its own moment of inertia as a point mass, as follows:
\(I_{f} =\frac{1}{2} * m* r^{2} + m_{cl} * r_{cl}^{2} =58.2 kgm2 + (8.7kg)*(1.5m)^{2} \\ = 58.2 kgm + 19.6 kgm2 = 77.8 kgm2 (4)\)
Replacing I₀, If and ω₀ in (2), we can solve for ωf, as follows:\(\omega_{f} = \frac{I_{o} *\omega_{o} }{I_{f}} = \frac{58.2kgm2*7.3rad/s}{77.8kgm2} = 5.5 rad/s (5)\)
A ball rows off a table with a horizontal velocity of four (ms/s). If it is 0.5 seconds for the ball to reach the floor, how high above the floor is the table top? Using g=10(m/s2)
Answers
Since the velocity roll off the table with a horizontal velocity this means that the vertical initial velocity is zero. Now, while the ball is falling, the vertical motion is a free fall motion, which means that we can use the following equation:
\(y=y_0+v_0t-\frac{1}{2}gt^2\)In this case we know that:
• The final height, y, is zero (the ground).
,• The initial velocity is zero.
,• The time it takes to hit the ground is 0.5 s.
,• The acceleration of gravity is 10.
Plugging these and solving for the initial height, y0, we have:
\(\begin{gathered} 0=y_0+(0)(0.5)-\frac{1}{2}(10)(0.5^2) \\ y_0=(5)(0.25) \\ y_0=1.25 \end{gathered}\)Therefore, the initial height is 1.25 m
817 cm3 at 80.8 kPa to 101.3 kPa
Answers
The volume of the gas at 101.3 kPa would be approximately 651.25 cm³.
To calculate the change in volume of a gas from an initial pressure to a final pressure, we can use Boyle's law, which states that the pressure and volume of a gas are inversely proportional at constant temperature.
Boyle's law can be expressed as:
P1 * V1 = P2 * V2
Where:
P1 = Initial pressure (80.8 kPa)
V1 = Initial volume (817 cm³)
P2 = Final pressure (101.3 kPa)
V2 = Final volume (to be calculated)
Let's plug in the values into the equation and solve for V2:
80.8 kPa * 817 cm³ = 101.3 kPa * V2
V2 = (80.8 kPa * 817 cm³) / 101.3 kPa
V2 ≈ 651.25 cm³
Therefore, the volume of the gas at 101.3 kPa would be approximately 651.25 cm³.
For more such questions on volume,click on
https://brainly.com/question/14197390
#SPJ8
A reaction has an activation Energy of 20 kJ and E = -60 kJ/mol. What would be the activation Energy for the REVERSE reaction?
A.) 40 kJ
B.) 80 kJ
C.)100 kJ
D.) 20 kJ
E.) 60 kJ
Answers
The activation energy for the reverse (backward) reaction would be 20 + 60 = 80 kJ/mol.
From the question, we are told that the activation energy of the reaction is 20 kJ and its E is -60 kJ/mol. A negative number for E means that it is an exothermic reaction, a reaction in which energy is released instead of absorbed.
The energy graph for an exothermic reaction is attached below. You can see that the activation energy for a backward reaction is EQUAL to the activation energy for the forward reaction + energy released.
Since we know the activation energy and E, the activation energy for the reverse (backward) reaction would be 20 + 60 = 80 kJ/mol.
Learn more about activation energy at https://brainly.com/question/1380484
#SPJ4
