Question 1

Calculate the gravitational force between the Earth (5.98x10^24 kg) and a 2500 kg satellite hovering 1000 km above the center of the Earth.

Accepted Answer

997165 N

Answer

1.495 x 10^22 N

Answer

9.97 x 10^11 N

Answer

1.495 x 10^25 N

Question 2

What is the momentum of a 143 kg person driving at 29.95 m/s?

Accepted Answer

4282.85 kgm/s

Answer

0.033 kgm/s

Answer

0.209 kgm/s

Answer

175.95 kgm/s

Question 3

An Olympic athlete throws the hammer in a competition.  The athlete throws the hammer in a counter-clockwise direction with a radius of 2.15 meters and with a velocity of 16.85 m/s.  If the ball (hammer) at the end weighs 7.257 kg, what is the centripetal force in this situation?

Accepted Answer

958.34 N

Answer

56.87 N

Answer

262.29 N

Answer

26.45 N

Question 4

What direction does the centripetal acceleration and tangential velocity point when an object is moving in a circular path?

Accepted Answer

inwards, 90 degrees to radius

Answer

90 degrees to radius, outwards along diamter

Answer

inwards, outwards

Answer

outwards, 60 degrees to diameter

Question 5

A father is spinning his son in a circle by the child’s arms?  The circle they create has a radius of 1.05  meters and they have an angular velocity of 6.8 rad/s.  What is the child’s tangential velocity if the father were to let go of the child?

Accepted Answer

7.14 m/s

Answer

0.15 rad/m/s

Answer

7.14 radm/s

Answer

6.48 rad/s

Question 6

A car experiences a change in momentum of 56.65 kgm/s.  How much force is needed to change the car's momentum in 0.15 seconds?

Accepted Answer

377.67 N

Answer

2517.18 N

Answer

8.5 N

Answer

1.27 N

Question 7

How much torque does a 3843 N force create when applied 750 cm from the pivot point?

Accepted Answer

28822.5 Nm

Answer

28822.5 Ncm

Answer

5.124 Nm

Answer

288250 Nm

Question 8

Two students A & B are jousting in shopping carts. During a collision, the students are launched into each other and fall to the ground together after catching each other in mid-air.  If student A is 75 kg and moves at 5.13 m/s, what is student B’s velocity if he has a mass of 70 kg.

Accepted Answer

-5.50 m/s

Answer

4.79 m/s

Answer

5.50 m/s

Answer

-4.79 m/s

Question 9

What does it mean to conserve  momentum?

Accepted Answer

The momentum before a collision equals  the momentum after a collision

Answer

Mass changes before and after a collision

Answer

Make more after a collision

Answer

Nothing

Question 10

Which of the following is NOT an inelastic collision?

Accepted Answer

Two atoms striking each other at room temperature

Answer

One football player tackling another in a game

Answer

A car crash and both cars bouncing off one another

Answer

Train cars connecting in a rail yard

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