Waves
What happens to the pitch of a sound wave as the sound source approaches you?
Pitch gets higher
An ice cream scoop gets knocked and falls out of the cone. At what point in the fall is the kinetic energy of the scoop greatest?
At the bottom
Jimmy uses 5.0 N of force to reel in a fish 25 m. How much work did Jimmy do?
125 J
(=130 N if taking into account s.f.)
Mercury has no atmosphere. If a bowling ball and a ping pong ball are dropped from the same height at the same time, which of the following is true?
a) The bowling ball reaches the ground before the ping pong ball
b) The bowling ball accelerates faster than the ping pong ball
c) The bowling ball has the same momentum as the ping pong ball when they hit the ground
d) The bowling ball has a greater impact force on the ground than the ping pong ball does
d) The bowling ball has a greater impact force on the ground than the ping pong ball does
For a circuit with a resistance of 60 Ohms and a power supply with a potential difference of 100 V, what is the current?
1.67 A
Brandon is at a party listening to music. He can barely hear the lyrics so he tells the DJ to turn up the song. Which properties of the sound wave change?
A) Amplitude
B) Pitch
C) Frequency
D) Wavelength
E) Speed
A) Amplitude
A stuntman jumps off the top of a crane onto an inflatable crash pad. At what point in the fall are the kinetic energy and potential energy equal?
Half way down
An ROTC cadet uses 3.0 J of work to raise a flag. If the cadet raises the flag 15 m in 6.0 seconds, how much power was used?
0.50 W (W: Watts)
If a balloon and an apple are dropped on the moon, which is not true?
A) Because the balloon is larger, it will have a greater gravitational force.
B) Because the mass of the apple is larger, it will have a greater gravitational force.
A) Because the balloon is larger, it will have a greater gravitational force.
The universe is expanding and doing so at an increasingly fast rate. What does this mean for the light we see from objects in space that are far away from earth?
It is red-shifted
If a wave B has lower frequency than wave A, which property is most likely to have changed?
a) distance between crests increased in B
b) height of the wave decreased in B
c) number of troughs increased in B
a) distance between crests increased
What happens to the frequency as the energy of an
a) an electromagnetic wave increases?
b) a sound wave increases?
a) increases
b) stays the same
Timmy is spinning in an office chair with his arms and legs out. As he pulls his arms and legs in, do the following increase, decrease or remain the same?
a) acceleration
b) energy
c) inertia
d) momentum
a) increases
b) same
c) decreases
d) same
Tom and Jerry are in a chase on a skyscraper. They both run off the edge and start falling. Which of the following are the same?
A) Momentum
B) Kinetic Energy
C) Acceleration
D) Force
E) Time to hit the ground
C) Acceleration
E) Time to hit the ground
If the universe is expanding at a fast speed, what shift would we be more likely to see?
A) Orange light shifted to red light
B) Blue light shifted to red light
B) Blue light shifted to red light
The sun emits many different types of electromagnetic waves from radio waves to UV rays and gamma rays. Which of the following wave properties is most likely to be the same for all of the waves the sun emits?
a) Energy
b) Frequency
c) Wavelength
d) Speed
e) Amplitude
d) Speed
A loose screw falls out and a sign falls to the ground. At which point is the sign's mechanical energy the highest?
Never - it is the same throughout (ME = PE+KE)
If a semi is reversing at a faster and faster speed is the acceleration positive, negative or zero?
negative
Two planets of equal mass are orbiting around each other. If the distance between the planets is ten times larger, by what factor does the gravitational force between them change?
1/100
Sketch the velocity time graph for the following scenario
A firework is launched into the sky. At first it travels upwards at a constant speed. Then the fuel runs out and it keeps going up but the speed slows down. After it explodes the stick then falls back down to earth.
flat, decreasing to zero, decreasing past zero
Roxy and Joe are walking down the sidewalk in opposite directions. Alexis is driving down the road playing loud music and passes Roxy. Joe and Roxy are at an equal distance from Alexis's car. Who hears Alexis's music at the highest frequency?
Joe
A Toyota can produce 3000 J of work. It carries a person 12 m in 30 seconds. A Kia produces twice as much power. How much power did the KIA use?
200 W
Consider the graph opposite. Which best describes the motion represented?
a) A car is reversing at a constant speed and makes an emergency stop. From rest the car accelerates at a constant rate and continues at the speed limit.
b) A person is jogging at a constant speed and comes to a sudden stop. From rest, they return to a comfortable pace, continuing on at the same pace.
c) A roller coaster travels at a constant speed, slows down gradually to a stop, then is catapulted back to a constant speed.
d) An elevator starts at a constant speed, stops and then accelerates at a constant rate before slowing to a stop.
B
If a watermelon and a strawberry are dropped on the moon, which of the following is NOT true?
a) The watermelon has more mass and therefore has a greater inertia
b) The watermelon has a greater surface area and therefore has a greater gravitational attraction
c) The strawberry has less mass and therefore has a smaller gravitational attraction
d) The strawberry has less inertia and therefore has a smaller gravitational attraction
b) The watermelon has a greater surface area and therefore has a greater gravitational attraction
Two spaceships are 50 meters apart in space alongside each other. If the distance between them decreases by 25m, by what factor did the force of gravity between them change?
4