Answer:
Acceleration is a vector, is measured in m/s, and A.
Explanation: SO BASICALLY, the answer to this question is A, B, and C. The last one would not fit the description of acceleration because it is describing Velocity.
Which of the following is not a change that occurred to organisms over time in the fossil record?
A. Decrease in in the number of species
B. Greater complexity
C. Increase in size
D. More diversity
Answer:A
Explanation: my teacher told me lol
The option that is not a change that occurred to organisms over time in the fossil record is A. Decrease in the number of species
A fossil record simply refers to the history of the life of the fossils. It means the remains of imprints of the organisms that are from earlier geological periods.
It should be noted that the fossil record is important to archeologists as it helps in placing events in their appropriate eras.
A change that didn't occur to the organisms over time in the fossil record is the decrease in the number of species.
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3. A lightbulb 500 J of energy is transferred to a lightbulb. 350 J is transferred as heat. The rest is transferred as light. Calculate the efficiency of the bulb.
The efficiency of a bulb can be calculated as the ratio of the useful energy output (in this case, the light energy) to the total energy input. In this scenario, the useful energy output is 500 J - 350 J = 150 J, and the total energy input is 500 J. So, the efficiency can be calculated as:
Efficiency = (useful energy output) / (total energy input) = (150 J) / (500 J) = 0.3 or 30%.
This means that 30% of the energy input was converted into useful light energy, while 70% was converted into heat. This is the efficiency of the bulb.
An AM radio station broadcasts using electromagnetic waves which travel at the speed of light, 3.00x108 m/s. When you tune your radio to 1350.0 kHz, what wavelength are you receiving
When you tune your radio to 1350.0 kHz, you're receiving electromagnetic waves with a wavelength of 222.22 m.
We're given that an AM radio station broadcasts using electromagnetic waves which travel at the speed of light, 3.00 x 108 m/s. Additionally, we know that when you tune your radio to 1350.0 kHz, you're receiving these electromagnetic waves. We can use the formula that relates the speed of light, wavelength, and frequency:
speed of light = wavelength x frequency (c = λf)
Rearranging this formula to solve for wavelength (λ),
we get:
λ = c / f
Plugging in the values given:
λ = (3.00 x 108 m/s) / (1350.0 x 103/s)λ
= 222.22 m
Therefore, when you tune your radio to 1350.0 kHz, you're receiving electromagnetic waves with a wavelength of 222.22 m.
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The free-fall acceleration at the surface of planet 1 is 15 m/s2. The radius and the mass of planet 2 are twice those of planet 1. Part A What is g on planet 2
Answer:
3.75m/s²
Explanation:
g= GM/r²
For planet 1
\(g_{1}\)= GM/r² (i)
\(g_{1}\) = 15m/s²
for planet 2
radius= 2*r= 2r
g= GM/r
\(g_{2}\)= GM/(2r)²
\(g_{2}\)= GM/4r²
\(g_{2}\)= GM/r² *1/4
from (i)
\(g_{2}\)= \(g_{1}\) *1/4
\(g_{2}\) = 15/4
\(g_{2}\) = 3.75m/s²
Which elements can conduct electrical charges: Metals or Non-metals?
The electric field strength 5.0 cm from a very long charged wire is 1900N/C .
What is the electric field strength 10.0 cm from the wire?
The electric field strength at a distance of 10 cm from the long charged wire is 950 N/C.
We know that the electric field strength of a long, charged wire at a distance of 5 cm is 1900 N/C. To find the electric field strength at a distance of 10 cm, we can use the formula below;\(\text{Electric field strength} = \frac{2k\lambda}{r}\)where;\(k\) is Coulomb's constant,\(\lambda\) is the charge density of the wire,\(r\) is the distance from the wire
Now, let's find the electric field strength at a distance of 10 cm.Using the above formula, we can write;\(\text{Electric field strength at a distance of 5 cm } = \frac{2k\lambda}{0.05} = 1900 N/C\)
Rearranging the equation above gives;\(k\lambda = \frac{1900\times0.05}{2} = 47.5 N/Cm\)
Using the value of \(k\lambda\) above, we can calculate the electric field strength at a distance of 10 cm as shown below;\(\text{Electric field strength at a distance of 10 cm} = \frac{2\times47.5}{0.1} = 950 N/C\)
Therefore, the electric field strength at a distance of 10 cm from the long charged wire is 950 N/C.
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you pull a friend up a 50 m rocky slope with tension force in the rope of 490 N the slope is very steep what work will you need to do in order to pull up your friend
Explanation:
F x d = work
490 N * 50 m = 24 500 J of work
madison's checking account had a balance of -$12. then she wrote a check for $15 which represents madison ´s account balance now
Answer:
$-27
Explanation:
madison's checking account had a balance of -$12. then she wrote a check for $15 which represents madison ´s account balance now?
a check is a withdrawal from the account so subtract:
-12 - 15 = -$27
Madison's account is over drafted by $27.
nate throws a basketball straight downward, letting it bounce once before catching it. we can ignore air resistance.what is true about the acceleration and velocity of the ball on its way down (while in the air)?
When Nate tosses a basketball, he lets it rebound once before letting it fall directly to the ground. Air resistance can be disregarded.
What does the word "resistance" mean?
An underground group of a captured or nearly won country engaged in sabotage and covert activities against occupying forces and collaborators. This psychological defense mechanism occurs when a patient rejects, dismisses, or otherwise resists the therapy efforts of a psychotherapist.
What is a circuit's electrical resistance?
The relationship between both the voltage applied and the flux through a circuit determines its electrical resistance. Ohms is the symbol for electrical resistance. Some materials permit the flow of electric charge more easily than others. The electrical resistance gauges how much the circuit restricts the movement of this electric charge.
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Which of the following describes the correct order of energy conversions necessary to form electricity from solar panels?
Solar Heat Kinetic → Electric
Solar- Kinetic Heat → Electric
Solar 1 Heat → Electric
O Solar ->Electric
Answer:
hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9
PLS HELP I NEED TO TURN THIS IN SOON
Consider a modified version of the vacuum environment in which the geography of the environment - its extent, boundaries, and obstacles - is unknown, as is the initial dirt configuration. (The agent can go Up and Down as well as Left and Right.) Can a simple reflex agent be perfectly rational for this environment? Explain.
A simple reflex agent cannot be perfectly rational in an environment with unknown geography because it lacks the necessary knowledge and understanding of the environment to make optimal decisions.
No, a simple reflex agent cannot be perfectly rational for an environment with unknown geography, extent, boundaries, and obstacles.
A simple reflex agent makes decisions based solely on the current percept (sensor input) without any knowledge of the environment's state or history.
In an unknown environment, the agent lacks any information about the spatial layout, obstacles, or dirt configuration. It can only react to immediate sensory input, which may not provide enough information for rational decision-making.
Without a model or understanding of the environment, the agent cannot anticipate future consequences or plan its actions effectively.
Perfectly rational in such an environment, the agent would require knowledge of the entire geography, boundaries, obstacles, and dirt distribution. It would need a comprehensive understanding of the environment to make optimal decisions and navigate efficiently.
Therefore, a simple reflex agent, limited to reactive responses without knowledge of the environment's structure or history, would not be perfectly rational in this scenario.
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Plz help me
A negative charge of-3.0Cand a lositive charge of 3.0 Care separated by 1m, What is the force between the two
charges?
A negative charge of -0,5 Cexerts a repelling force of 10.0 N on a second charge that is 0.5m away. What is the sign
and magnitude of the second charge?
R21
Answer:
sign of the other charge is -ve
A student drops a rock from rest at a distance h above the ground such that the rock hits the ground at time t. At what distance above the ground should the rock be dropped such that it hits the ground at 2t after it is released from rest
The distance above the ground the rock should be dropped such that it hits the ground at 2t after it is released from rest is 4h.
What is the height of fall of the rock?
The height of fall of the rock is calculated by applying the following kinematic equation as shown below.
h = vt + ¹/₂gt²
where;
v is the initial velocity of the rockt is the time of motion of the rockg is acceleration due to gravityh is the height of fall of the rockh = 0 + ¹/₂gt²
h = ¹/₂gt²
2h = gt²
g = 2h / t²
h₁ / t₁² = h₂ / t₂²
The distance above the ground the rock should be dropped such that it hits the ground at 2t after it is released from rest is calculated as;
h₂ = ( h₁ / t₁² )(t₂²)
h₂ = ( h/t²)(2t)²
h₂ = ( h/t²)(4t²)
h₂ = 4h
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When a bulb is added in parallel to a circuit with a single bulb, the resistance of the circuit.
When a bulb is added in parallel to a circuit with a single bulb, the total resistance of the circuit decreases.
In a parallel circuit, each component (bulb) has its own separate path for the current to flow. When another bulb is added in parallel, it provides an additional pathway for the current to pass through. This increases the total current flowing through the circuit.
According to Ohm's Law (V = IR), the current (I) is inversely proportional to the resistance (R). As the total current increases in a parallel circuit, the overall resistance decreases.
Therefore, when a bulb is added in parallel to a circuit with a single bulb, the resistance of the circuit decreases.
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--The question is incomplete, the complete question is:
"When a bulb is added in parallel to a circuit with a single bulb, the resistance of the circuit:
a. remains the same
b. decreases
c. increases
d. triples"--
patch, r., 1971, thermodynamic properties and theoretical rocket performance of hydrogen to 100000 k and 1.01325x10^8 n/m^2, sp-3069, national aeroanutics and space agency
The paper titled "Thermodynamic Properties and Theoretical Rocket Performance of Hydrogen up to 100,000 K and 1.01325x\(10^8\) N/\(m^2\)" by R. Patch, published in 1971 (SP-3069) by the National Aeronautics and Space Agency (NASA), focuses on the thermodynamic properties and performance of hydrogen as a propellant at high temperatures and pressures.
The paper authored by R. Patch and published by NASA in 1971, titled "Thermodynamic Properties and Theoretical Rocket Performance of Hydrogen up to 100,000 K and 1.01325x\(10^8\) N/\(m^2\)" (SP-3069), explores the thermodynamic properties and theoretical rocket performance of hydrogen under extreme conditions. The research specifically investigates hydrogen as a propellant, analyzing its behavior at temperatures up to 100,000 Kelvin and pressures of 1.01325x\(10^8\)Newtons per square meter (N/\(m^2\)).
The study likely provides valuable insights into the thermodynamic properties of hydrogen and its performance as a rocket propellant, which are crucial factors in designing and optimizing rocket engines. Understanding how hydrogen behaves under extreme temperatures and pressures is essential for achieving efficient and effective propulsion systems. This research can aid in the development of advanced rocket technologies and contribute to the overall advancement of space exploration and transportation.
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the silvered wall of a vacuum bottle takes care of heat flow by
Radiation
Convection
Conduction
Conduction and convection
a proton is placed at point a. the proton is then removed and an electron is placed at point b. what is the direction of the electric force ? give angle relative to x with ccw as positive. what is the direction of the electric force ? what is true of the magnitude of the two forces?
When a proton is removed from point A and an electron is placed at point B, the direction of the electric force will be from point B towards point A. The angle of this force relative to the x-axis would be 180 degrees, with counterclockwise as positive.
As the electron and proton have equal and opposite charges, the magnitude of the force between them will be the same as the magnitude of the force between the proton and the electron.
The magnitude of the force between the proton and electron can be determined by Coulomb's law, which states that the force is proportional to the product of the charges and inversely proportional to the square of the distance between them.
In other words, the magnitude of the two forces is equal, but the direction of the two forces is opposite.
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why are dams have broader walls at the bottom?
a jet fly 700 km due north, then 300 km West, after which It Moves 400 km due north and 800 km due east before it arrives at its destination and landed. using vector notation, draw the movement
To represent the movement of the jet using vector notation, we can break down the journey into its individual components and assign appropriate vectors to each segment.
First, let's assign the positive x-axis to the east direction and the positive y-axis to the north direction. The jet starts by flying 700 km due north. This can be represented as a vector in the positive y-direction: 700 km north, or (0, 700).
Next, the jet travels 300 km west. This can be represented as a vector in the negative x-direction: -300 km west, or (-300, 0).
Afterward, the jet moves 400 km due north. Again, this can be represented as a vector in the positive y-direction: 400 km north, or (0, 400).
Lastly, the jet travels 800 km due east. This can be represented as a vector in the positive x-direction: 800 km east, or (800, 0).
To determine the overall movement, we can sum up these individual vectors. Adding them up, we have:
(0, 700) + (-300, 0) + (0, 400) + (800, 0)
Simplifying, we get:
(0 + (-300) + 0 + 800, 700 + 0 + 400 + 0)
= (500, 1100)
Therefore, the movement of the jet, represented in vector notation, is (500, 1100). This means that the jet traveled 500 km east and 1100 km north from its starting point to reach its destination.
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what is the phase defig. 1 resistor circuit1) find vr(t) and ir(t)2) what is the phase difference between vr(t) and ir(t)?
The phase defig in an resistor electrical circuit refers to the phase difference between the voltage and the current.
In a resistor circuit, the voltage (vr) and the current (ir) are related by Ohm's law: vr = irR, where R is the resistance of the resistor. To find vr(t) and ir(t), we need to know the time-dependent behavior of the voltage and the current.
Assuming that the circuit is driven by a sinusoidal voltage source with a frequency of ω, we can express the voltage and the current as vr(t) = Vrms*cos(ωt + φv) and ir(t) = Irms*cos(ωt + φi), where Vrms and Irms are the root-mean-square values of the voltage and the current, and φv and φi are the phase angles of the voltage and the current, respectively.
To find vr(t) and ir(t), we need to determine Vrms, Irms, φv, φi, and R. Once we have these values, we can use the above equations to calculate vr(t) and ir(t).
To determine the phase difference between vr(t) and ir(t), we need to calculate the phase angle φ = φv - φi. The phase angle represents the difference in time between the peaks of the voltage and the current waveforms.
In summary, the phase defig in an electrical circuit refers to the phase difference between the voltage and the current.
To find vr(t) and ir(t), we need to know the time-dependent behavior of the voltage and the current, which can be expressed in terms of Vrms, Irms, φv, φi, and R. The phase difference between vr(t) and ir(t) can be calculated as φ = φv - φi.
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A ball of mass m moving with velocity v collides with another ball of mass 2m and sticks to it. The velocity of the final system is:A. v/3B. v/2C. 2vD. 3v
The velocity of the final system is v/3. Option A.
Solution:
The momentum of the body is defined as:
p = mv
The initial momentum of the body:
pi = mv
The final momentum of the two bodies after the collision is :
pf = (m+2m)v 1
By using the conservation of linear momentum for the collision between the bodies:
mv = (m+2m) v1
v/3 =v 1
Velocity is the primary measure of object position and velocity. It can be defined as the distance traveled by an object in a unit of time. Velocity can be defined as the displacement of an object in a unit of time. Velocity is the speed at which something moves in a particular direction. For example, the speed of a car traveling north on a highway, or the speed of a rocket after launch.
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I NEED HELP ASAP!! PLEASE
A skydiver falling towards Earth and is traveling at 19 m/s opens her parachute. She slows to a speed of 3 m/s The whole process takes only 2 seconds . What is her acceleration ? Explain why this acceleration is positive or negative
Answer:
Acceleration = -3m/s²
Explanation:
Given the following data;
Initial velocity = 19m/s
Final velocity = 3m/s
Time = 2secs
To find the acceleration;
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time. Mathematically, acceleration is given by the equation;
\(Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}\)
Substituting into the equation, we have;
\(a = \frac{3 - 9}{2}\)
\(a = \frac{-6}{2}\)
Acceleration = -3m/s²
The value for her acceleration is negative because she is decelerating i.e her final velocity is lower than her initial velocity.
Which is true of ionic compounds?
A. They are good conductors
B.They are made by sharing electrons
C.They are made of metals and non-metals
D.They are electrically neutral when dissolved in a solution
Answer:
kgddfffydyzydydyztztztt
b
tell the uses of coal
Answer:
"Coal has many important uses worldwide. The most significant uses of coal are in electricity generation, steel production, cement manufacturing and as a liquid fuel. Different types of coal have different uses. Steam coal - also known as thermal coal - is mainly used in power generation."
Explanation:
Answer:
Coal can be used for many things. Mostly though, to help steel production. For example, electricity generation. They can also be used for cemet as a liquid fuel. There are many types of coals with different purposes.
86. A 71-kg man stands on a bathroom scale in an elevator. What does the scale read if the elevator is ascending with an acceleration of 3.0 m/s2?A) 140 NB) 480 NC) 690 ND) 830 NE) 910 N
If the elevator is ascending with an acceleration of 3.0 m/s², then the scale reading will be E) 910 N.
To find the scale reading in the given situation, we'll use Newton's second law of motion, which states that force (F) equals mass (m) times acceleration (a). In this case, the man experiences two accelerations: gravity (g = 9.81 m/s²) and the elevator's acceleration (a = 3.0 m/s²). The total acceleration is the sum of both accelerations.
Total acceleration = g + a = 9.81 m/s² + 3.0 m/s² = 12.81 m/s²
Now, we can find the force (weight) that the scale reads:
F = m * total acceleration = 71 kg * 12.81 m/s² ≈ 910 N
So, the scale reads approximately 910 N, which corresponds to option E.
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Cart A has mass M and is released from rest at a height 2H on a ramp making an angle 2 with the horizontal, as shown above. Cart B has mass 2M and is released from rest at a height H on a ramp making an angle with the horizontal. The carts roll toward each other, have a head- on collision on the horizontal portion of the ramp, and stick together. The masses of the carts’ wheels are negligible, as are any frictional or drag forces.
a.) Derive an expression to determine the velocity of Cart A in terms of the variables given in the prompt.
b.) Derive an expression to determine the velocity of Cart B in terms of the variables given in the prompt.
c.) Determine the final velocity of the carts after the collision.
d.) Is the collision elastic or inelastic? Justify your answer.
*Answers should not include numbers, only variables.
a) The expression to determine the velocity of cart A is \(v_{A} = 2\cdot \sqrt{g\cdot H}\).
b) The expression to determine the velocity of cart B is
\(v_{B} =\sqrt{2\cdot g\cdot H }\).
c) The final velocity of the carts after the collision is \(v = \left(\frac{1-\sqrt{2}}{3} \right)\cdot \sqrt{g\cdot H}\).
d) The collision is inelastic since a part of the energy of the entire system is lost when they stick together.
Study of an inelastic collisionIn this question we shall apply principle of energy conservation and principle of linear momentum conservation to model an inelastic collision between two carts.
a) The combination of cart and ramp can be considered a conservative system as there are no non-conservative forces (i.e. friction), the final velocity of cart A (\(v_{A}\)) is related to the change in gravitational potential energy:
\(\frac{1}{2}\cdot M\cdot v_{A}^{2} = M\cdot g \cdot 2\cdot H\) (1)
Now we clear \(v_{A}\) and simplify the resulting expression:
\(v_{A} = 2\cdot \sqrt{g\cdot H}\)
The expression to determine the velocity of cart A is \(v_{A} = 2\cdot \sqrt{g\cdot H}\). \(\blacksquare\)
b) We apply the same approach used in part b) to find the final velocity:
\(\frac{1}{2}\cdot (2\cdot M) \cdot v_{B}^{2} = (2\cdot M)\cdot g \cdot H\) (2)
Now we clear \(v_{B}\) and simplify the resulting expression:
\(v_{B} =\sqrt{2\cdot g\cdot H }\)
The expression to determine the velocity of cart B is
\(v_{B} =\sqrt{2\cdot g\cdot H }\). \(\blacksquare\)
c) The final velocity (\(v\)system is determined by principle of linear momentum conservation:
\(3\cdot M\cdot v = M\cdot 2\cdot \sqrt{g\cdot H}-2\cdot M\cdot \sqrt{2\cdot g\cdot H}\)
\(3\cdot v = 2\cdot (1-\sqrt{2})\cdot \sqrt{g\cdot H}\)
\(v = \left(\frac{1-\sqrt{2}}{3} \right)\cdot \sqrt{g\cdot H}\)
The final velocity of the carts after the collision is \(v = \left(\frac{1-\sqrt{2}}{3} \right)\cdot \sqrt{g\cdot H}\). \(\blacksquare\)
d) The collision is inelastic since a part of the energy of the entire system is lost when they stick together. \(\blacksquare\)
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if buoyant force push things upwards, why don't hot air balloons and planes get pushed into outer space
Answer:
I think that's because the force of gravity is greater than the buoyant force, and for the hot air balloons, they can increase/decrease the temperature of the air in the balloon in order for it to rise/fall for more control. For planes, they use aerodynamics as well as the help of a couple of engines to thrust the plane forward. I hope this helps.
The color of light emitted during a flame test depends on
A) the location of electrons only
B) the size of the atom only
C) the size of the atom and the location of protons
D) the location of electrons and size of the atom
the answer is D
PLEASE HELP I NEED ANSWERS ASAP I WILL GIVE BRAINIEST AND 5 STARS