Semester 2 Physics Final Review

A 70 kg runner has a velocity of 5 m/s. Her kinetic energy is

• 875 J

• 175 J

• 1750 J

• 350 J

You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what type of energy does it have?

• Potential Energy

• Kinetic Energy

• Nuclear Energy

• Chemical Energy

Bro A bench presses 145-lbs five times in 20 seconds. Bro B bench presses 145-lbs five times in 10 seconds. Which of the following is true?

Bro

• Bro A has more power

• Bro B has more power

• Both Bros have the same power

• Bro C was ignored his whole childhood, so he must have the most power.

Which number would most realistically represent the weight of a ninth grade student?

answer choices

• 668 Newtons

• 125 Newtons

• 18.4 Newtons

• 20,345 Newtons

If 150 Joules of work is needed to move a box 10 meters, what force was used? 

• 1500 N

• 15 N

• 1.5 N

• 150 N

A 10 kg object with gravitational potential energy of 800 J is released and allowed to fall to the ground. What is its velocity just before it hits the ground ?

• 63.4 m/s

• 81.6 m/s

• 9.8 m/s

• 12.6 m/s

a)Between which letters is a wavelength?

b)Between which letters is the amplitude?

• a) B and F

  b)F and G

• a)C and D

  b)A and B

• a)B and F

  b)C and D

• a)A and E

  b)F and G

Which of the following statements is true regarding the speed of sound?

• The speed of sound is a constant that never changes

• The speed of sound increases in cold weather

• The speed of sound decreases in hot weather

• Speed of sound helps determine the frequency of of a pitch due to the Doppler Effect

What is the wavelength of the sound made by this tuning fork? The speed of sound is 343 m/s and the frequency of the tuning fork is 512 Hz.

(Round to the hundredths place and don't forget units!)

A wave has a velocity= 600 m/s and a wavelength= 2.0m. What is its frequency?

• 300 Hz

• 0.0033 Hz

• 3000 Hz

• none of these answers