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1. A parallel-capacitor is connected to a battery. What happens to the stored energy if the plate separation is doubled while the capacitor remains connected to the battery?
(A) It remains the same
(B) It is doubled
(C) It decreases by a factor of 2
(D) I decreases by a factor of 4
(E) It increases by a factor of 4
2. A medical defibrillator stores 1000 J of energy in a 100 microF capacitor. What is the voltage across the capacitor?
A golf ball is hit horizontally from the edge of a ramp. It lands at an elevation 200 m below and its trajectory upon landing is 45° angle below the horizontal
A 1.5 {rm kg} block rests on top of a 7.5 {rm kg} block. The cord and pulley have negligible mass, and there is no significant friction anywhere. What force F should be applied to bottom block so the top block accelerates to the right at 2.60 m/s^..
A 7 L rigid (constant volume) container holds 0.81 moles of helium at an initial temperature of 75 oC. How many moles of gas will be in the container at the final temperature
Find the recoil speed of the rifle. ________ m/s (b) If a 700-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle. ________ m/s
A disk has a moment of inertia of 3.0x10-4 kgm2, and rotates with an angular speed of 3.5 rad/sec. What is the magnitude of the net torque must be applied to bring it to rest in 3.0 s?
A man walking on a tightrope carries a long a pole which has heavy items attached to the two ends. what difference would it make to his balance
A transformer is made by winding a primary coil of 270 turns around an iron core. what is the output voltage on the secondary
A casette player is said to have a signal-to-noise ratio of 58 dB, whereas for a CD player it is 95 dB. What is the ratio of intensities of the signal and the background noise for each device?
a metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end, At what rate is energy being transferred to thermal energy
in a diesel engine the piston compresses air at310k to a volume that is0.0629of the original volume and a pressure that
A certain gyroscope consists of a uniform disk with a 56 cm radius mounted at the center of an axle that is 13 cm long and of negligible mass. what is the precession rate
A dock worker applies a stable horizontal force of 79.0 {rm N} to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves 14.0 {rm m} in the first 6.00 {rm s}.What is the mass of the bl..
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