You are at the leading end of a canoe and your friend is at the trailing end whi

Question

You are at the leading end of a canoe and your friend is at the trailing end while the canoe is drifting along at a speed v. You toss a backpack to your friend. While the backpack is in flight, what is the canoe's speed? Ignore any friction effects between the canoe and the water. It is greater than v. It is less than v. It maintains the same speed it had before the backpack was thrown. We cannot tell from the information given. You have a piece of clay and a rubber ball, both of the same mass. You want to close a door on the other side of the room by throwing either the clay or the rubber ball at the door. Assume that both would be thrown with the same speed and would impact the door at the same point on the door. With which would you be more likely to cause the door to close further? the rubber ball the clay ball Both would cause the door to close the same distance. it is impossible to tell. A planet has 3 moons, all of equal mass. Moon 1 is in a circular orbit of radius r, Moon 2 is in a circular orbit of radius 2r, and moon 3 is in a circular orbit of radius 3r. The ratios of the gravitational force exerted by the planet on each of the moons, 1, 2, and 3 are respectively. 1:2:3 1:1:1 1.4:9 9:4:1 Which of the following forms of energy is the greatest for a system of a comet in orbit about the Sun during perihelion (the comet's closest approach to the Sun). the total mechanical energy the potential energy the kinetic energy none of these On which planet would you experience the highest gravitational acceleration? on one with twice the radius of the Earth and twice the mass on one with half the radius of the Earth and half the mass on the Earth on one with twice the radius of the Earth and half the mass You can determine the mass of the Moon by measuring how long it takes to revolve around the Earth. by measuring Its distance from the Earth. by measuring the rate at which objects accelerate due to gravity on the Moon. by measuring its diameter. With which wrench would you have the best success in loosening a bolt? Assume that the socket part of the wrench is the same site in each case. one in which the handle is 10 cm long and 2 cm wide one in which the handle is 12 cm long and 2 cm wide one in which the handle is 10 cm long and 4cm wide They would all loosen the bolt just as effectively. Your electric drill has been on for a period of time and you turn it off. The time interval for the rotating bit to come to rest due to frictional torque is Delta t. You replace the bit with a smaller one that results in a smaller moment of inertia of the entire rotating mechanism of the drill by a factor of 2/3. When this smaller bit is

Explanation / Answer

5)
by conservation of momentum
Answer: a

6)
rubber ball will impact greater force as it will rebound
Answer: a

7)
F = G*M*m/r^2
so, F is inversely proportional to r^2
so, F should decrease as r increases
Answer: d

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