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A 80-g bullet is fired from a rifle having a barrel 0.582 m long. Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is 14100 + 9100x - 24250x2, where x is in meters. (a) Determine the work done by the gas on the bullet as the bullet travels the length of the barrel. kJ (b) If the barrel is 1.10 m long, how much work is done? kJ (c) How does this value compare with the work calculated in part (a)? percent difference = ? %
Jessica's weight is 540 newtons. According to the Third Law, if the Earth pulls on Jessica with a force of 540 N, then Jessica pulls on the Earth with a force of 540 newtons that acts in the opposite direction.though , if Jessica stumbles while rol..
The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius rh = 0.315 m and mass 4.89 kg, what should the radius of the disk be
A 5.9-kg rock and a 6.6 × 10-4-kg pebble are held near the surface of the earth. Determine the magnitude of the gravitational force exerted on each by the earth
When point charges q1 = +2.1 ?C and q2 = +8.1 ?C are brought near each other, each experiences a repulsive force of magnitude 0.66 N. Determine the distance between the charges.
A girl is sledding down a slope that is inclined at 30º with respect to the horizontal, The combined mass of the girl and the sled is 76.5 kg, How much time is required for the sled to travel down a 149-m slope, starting from rest
You look at yourself in a shiny 8.4-cm-diameterChristmas tree ball. If your face is 21.0cm away from the ball's front surface, where is your image? Follow the sign conventions. Is it real or virtual
A hoist motor supplied by a 240 V source requires 12 A to lift an 800 kg load at a rate of 9.00 m/min. Determine the power input to the motor
She only uses the most accelerated depreciation method possible. The computer is the only personal property which she places in service during the year. Illustrate what is her total depreciation deduction for 2011?
A steel bar is subjected to a vibration at one end, with an amplitude of 0.001 meters and a frequency of 250 Hz. Express the position of the end as a function of time
To keep her dog from running away while she talks to a friend, Susan pulls gently on the dog's leash with a constant force given by F = (2.1 N ) ^x+ (1.5 N )^y, How much work does she do on the dog
The work function of a certain metal is 3.00 eV. What is the kinetic energy of a photoelectric in both "J" and "eV" for an incident photon of wavelength 400.0 nm
A 130 kg crate is pushed at constant speed up the frictionless 28° ramp. What force is exerted by the ramp on the crate
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