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Q. A student, sitting on a stool rotating at a rate of 20 RPM holds masses in each hand. when his arms are extended, the total rotational inertia of the system is 4.5 kg/m^2. he pulls his arms in close to his body, reducing the total rotational inertia to 1.5kg/m^2. if there are no external torques, what is the new rotation velocity of the system.
Q. A diverging lens (f = -12 cm) is located 20.0 cm to the left of a converging lens (f = 34.5 cm). A 3.00 cm tall object stands to the left of the diverging lens, exactly at its focal point.
Two plane mirrors facing each other are 10 m apart. A woman stands 3 m from one of the mirrors and looks at the mirror and sees two distinct images. How far are these images from the woman.
Suppose that you hear a clap of thunder 18.4 s after seeing the associated lightning stroke. The speed of sound waves in air is 343 m/s and the speed of light in air is 3.00 x10^8 m/s. How long are you from the lightning stroke.
Assume that the rod is held at rest horizontally and then released. (Throughout the remainder of this problem, your answer may include the symbol, moment of inertia of the assembly, whether or not you have answered the first part correctly.)
A 38.8-cm diameter disk rotates with a constant angular acceleration of 2.60 rad/s2. It starts from rest at t = 0, and the line drawn from the center of the disk to the point P on the rim of the disk makes an angle of 57.3° with the positive x-axis a..
Eight lights are connected in parallel to a 116 V source by two leads of total resistance 1.1. If 240 mA flows through each bulb, what is the resistance of each? What fraction of the total power is wasted in leads.
Two boxes, m1 = 1.0 kg with a coefficient of kinetic friction of 0.10, and m2 = 2.0kg with a coefficient of 0.20, are placed on a plane inclined at 0 = 30o.
A baseball pitcher can throw a ball with a speed of 70m/s. He is in the back of a pickup truck that is driving away from you. He throws the ball in the direction, and it floats toward you at a lazy 10 m/s.
Compute the acceleration of a 0.55m diameter car tire while the car is travelling at a constant speed of 25m/sec. b. compare this with the acceleration experienced by a jet car tire diameter 1 when setting a land speed record of 310m/sec.
Travelling at the speed of 14.10 m/s, driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.650. What is the speed of automobile after 1.130 s have elapsed..
The concrete encloses one steel reinforcing rod with cross-sectional area 1.00cm2. The rod joins two strong end plates. The cross-sectional area of the concrete perpendicular to the rod is 47.5 cm2. Young's modulus for the concrete is 3.00 x 10^10 N/..
Two objects have masses m and 5m respectively.They both are placed side by side on a frictionless inclined plane and allowed to slide down from rest.
Compute the average linear velocity of the discus
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