1)Two high performance bicycle wheels have the same mass but one is solid disk and the other is a hoop with very light(as compared to the mass of the rime)spokes. Which wheel takes the most energy to accelerate to a speed v? Ignore any air and rolling resistances.
The disk wheel requires more energy
The spokes wheel requires more energy
Both take the same amount of energy
It depends on the radius of each wheel
2)An astronaut on a strange planet finds that the acceleration due to gravity is two times greater than that on earth. Which of the following could explain this?
The mass of the planet is half that of the earth's but its radius is the same
The radius of the planet is half that of the earth's but its mass is the same
Both the mass and the radius are twice the earth's values
Both the mass and the radius are half the earth's values
3)A ball of mass of 10g is hung from the end of a light vertical spring and set oscillating with an amplitude of 10cm. The period of the oscillation is 1s. If the ball is now replaced by another with a mass of 40g and again set oscillating with the same amplitude, its new period of oscillation will be,
1s
2s
4s
8s
4)The human ear canal, which is open to the atmosphere and ends at the ear drum, is about 3cm long. Which of the following is the best approximation to the fundamental resonant frequency of the ear canal?
1500Hz
3000Hz
6000Hz
11000Hz
5)A metal ball is connected to the ground with a wire via a switch. The switch is initially closed (i.e. the ball is connected to the ground) while a charge +Q is brought close to the ball(but not touching). While the charge is near the ball, the switch is opened and then the charge is taken away. The charge on the ball is now,