Question

1. Freddie and Carly decide to play a trick on Lewbert by suspending a mannequin that
is made-up as a Zombie from a 3 m long, 0.35 mm diameter steel wire in the middle of
the lobby. The Zombie has a mass of 17 kg. What is the change in length of the wire
due to the weight of the Zombie?

2. Luna Loggerhead is riding on a playground merry-go-round at a radius of 1.8 m. If
she must hold on with a force that is 1.5 times her body weight, what is her velocity?

3. SpongeBob and Patrick take a ride on the rocket ship that they built to a beautifully
spherical asteroid and land on it surface. If they experience an acceleration due to
gravity of .098 m/s 2 . If they measure the asteroid’s radius and find it to be 11,224 m,
then what is its’ mass?

4. Mr. Krabs is riding on the Flying Dutchman’s galleon that has a mass of 3.25 ×10 5 kg
at a speed of 15 m/s. He strikes a large rock comes to rest 6 seconds later, damaging
the ship immensely. Calculate the average force exerted on the rock using the concept
of impulse.

5. Lawrence Loggerhead goes to the surface for a ski vacation. He is going along a flat
smooth plane when he descends an incline of 40 o incline, which has a vertical drop of
6.3 m. He has a starting velocity of 10 m/s. What is his velocity just after the incline if
his mass is 70 kg and the coefficient of friction between his skis and the snow is 0.04?
(Hint: Find the distance traveled down the incline assuming a straight-line path as
shown in the figure.)

Answer 1

mention in comment if you have any doubt