# Fall Review 4: Question Preview (ID: 12111)

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**A race car traveling at 50 m/s applies its brakes and comes to a complete stop in 5.0 seconds. what is the carâ€™s acceleration?**

a) -10 m/s2

b) 250 m/s2

c) 0 m/s2

d) 9.8 m/s2

**The earth __________around the sun and __________around its axis.**

a) rotates, revolves

b) revolves, rotates

c) none of these

d) both of these

**What is a centripetal force?**

a) an inward force.

b) an outward force

c) a nonexistent force

d) a linear force

**As the rotational speed of an object increases its linear speed**

a) increases

b) decrease

c) stays the same

d) linear speed and rotational speed are the same thing

**If you whirl a tin can on the end of a string and the string suddenly breaks the can will fly____________.**

a) directly away from you

b) directly toward you

c) tangent to its circular path

d) it will continue in a circular path

**A ball is left in the cabin of an airplane. When the plane accelerates forward, the ball rolls to the back of the cabin. What happens when the plane stops?**

a) It is thrown harder against the back.

b) It rolls to the front of the cabin.

c) The ball's inertia keeps it against the back.

d) The ball is not affected by the stop (deceleration).

**If a person has a mass of 20 kg, what is there weight in Newtons and pounds on Earth? (g= 10 m/s2 and 1 kg = 2.2 lbs.)**

a) 200 N and 44 lbs.

b) 10 N and 44 lbs.

c) 200 N and 9.1 lbs.

d) 100 N and 9.1 lbs.

**There are ________ centimeters in 2.5 meters?**

a) .0025 cm

b) .025 cm

c) 25 cm

d) 250 cm

**A tire on a car has a radius of .9 m and rotates at an angular speed of 60 rad/s. How fast is the car traveling?**

a) 85.7 m/s

b) 54 m/s

c) 85.7 radians

d) 54 radians

**A ball is thrown straight down at a speed of 3.0 m/sec and accelerates under the pull of gravity for 2.0 seconds. How fast is it moving? (v=v0+at; x=v0t+1/2at2)**

a) 6 m/s

b) 23 m/s

c) 18 m/s

d) 6 m

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