Question-

1. Romeo is on the roof of a building so as to be 20 m high. He spies Juliet standing directly below him at the front door clutching a cloth bag. He calls out to her to hold the bag open so that he can drop a juicy cantaloupe into it. He knows that the bag can withstand a cantaloupe that is traveling at no more than 10 m/s, anything moving faster will tear a hole in the bag. Can he drop the cantaloupe safely into the bag?
a) No, he just cannot do it.

b) Yes, by throwing it downwards at 10 m/s.
c) Yes, by dropping it from rest.

d) Yes, by throwing it vertically upwards at 10 m/s.

2. A 0.05-kg bullet traveling at 120 m/s tears into a slab of thick wood. The wood exerts a constant retardation (negative acceleration) of magnitude 8000 m/s2. How long will it take the bullet to come to a stop?
a. 0 s b. 0.01 s c. 1.5 s d. 0.15 s e. 0.015 s f. none of the previous

3. The cable of a crane pulling up a container of mass 600 kg from the hold of a ship can have a maximum tension of 6600 N before it snaps. With what maximum acceleration (in m/s2) can the container be hauled up?
(Hint: This is another form of the 'elevator-weight' problem.)
a. 6 b. 10 c. 1 d. 11 e. 2 f. none of the previous

4. A bomber pilot flying horizontally at a height of 400 ft and moving with a speed of 300 mph (30 mph = 44 ft/s) releases a bomb. How far horizontally from the launch point does the bomb strike the ground? (g = 32 ft/s2)
a. directly below the plane b. 440 ft c. 1600 ft d. 4400 ft e. 220 ft f. none of the previous

5. A dab of mud (mass 0.1 kg, and sitting 0.25 m from the centre) flies off a horizontal spinning wheel when the wheel takes 1 s to complete one circuit. How large is the friction force between the wheel and the mud?
a) 4.0 N b) 1.0 N c) 0.05 N d) 0.25 N e) 2.0 N

6. Which has the larger momentum, a bus loaded with 40 passengers or a young man rollerblading at 30 mph if both have the similar kinetic energy?
a) The young man

b) The bus

c) Both have the same momentum

d) Not enough information to answer

7. A friend of yours is at a window of a building 45 m above the street. You are 40 m below him. He drops a ball. How long can you wait before you drop your own ball so that the two arrive at the pavement at the same time? (Assume g = 10 m/s2)
a) 0 s b) until you see the other ball falling past you c) 1 s d) 2 s e) 3 s

8. You throw a 0.15-kg baseball horizontally so that it leaves your hand with a speed of 40 m/s. How much work did you do on it?
a) 0 J b) 15 J c) 60 J d) 100 J e) 120 J f) none of the previous

9. You are stuck in the center of a frozen circular lake with a surface so slippery that you cannot get any traction. You take off your shoes (mass 2 kg) and throw them towards the southern shore 100 m away with a speed of 30 m/s. immediately, you find yourself coasting. If your mass (fully clothed but unshod) is 80 kg you will arrive at the _________ shore in _____.
a) southern ...... 3.3 s b) northern ......3.3 s c) southern ......67 s
d) northern ......67 s e) southern ....... 133 s f) northern ......133 s
g) none of the previous

10. Hitting your toothbrush on the side of the sink dries it off. Which law of physics is being obeyed?
a) Ideal gas b) Snell's c) Newton's 1st d) Newton's 2nd e) Newton's 3rd