Answer the Questions

1. A buffalo reaches a maximum velocity of 14 m/s after running for a distance of 50 m. If the buffalo started at a velocity of 8 m/s, what was its acceleration? Assume the buffalo is running in a straight line and the acceleration is constant.

a. 0.96 m/s²

b. 1.32 m/s²

c. 0.28 m/s²

d. 2.64 m/s²

2. Earth is (on average) located about 1 Astronomical Unit (AU) away from the Sun. Suppose that the gravitational force between Earth and the Sun is equal to 100,000 Newtons. If we move Earth so that is is 50 AU away from the Sun, what would the gravitational force be between them?

a. 4 N

b. 40 N

c. 2000 N

d. 1000 N

3. Jupiter has a mass that is 318 times the mass of the Earth. Jupiter exerts a greater gravitational force on the Earth because it has greater inertia.

a. True

b. False

4. A projectile is fired at 75 with an initial velocity of 30 m/s. How long will the projectile remain in the air? Assume the initial and final heights are both zero meters.

a_y= -9.8 m/s²

a. 43 s

b. 6.12 s

c. 3.06 s

d. 5.91 s

5. A pendulum with a frequency of 40 Hz has a period that is half as much as a pendulum with a frequency of 80 Hz.

a. True

b. False

6. Suppose you are playing a game of tug of war with a friend. You pull with a force of 300 N. Your friend pulls with a force of 250 N. If your friend has a mass of 50 kg, what is their acceleration?

a. 1 m/s²

b. 11 m/s²

c. They don't accelerate because the net force on them is zero

d. 5 m/s²

7. What is the metric unit of force?

a. Pound

b. Joule

c. Watt

d. Newton