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A 25-g lead bullet is shot with a speed of 240 m/s into a wooden wall. Assuming that 70% of the kinetic energy is absorbed by the bullet as heat (and 30% by the wall), what is the final temperature of the bullet? (Assume the bullet is initially at room temperature of 20°C.
A sphere of mass M is supported by a string that passes over a pulley at the end of a horizontal rod of length L, Find the mass of the portion of the string above the rod
A block (m = 3 kg) is sitting on a horizontal frictionless table. A spring (k = 500 N/m) is mounted at the side of this block so that when the block is used to compress the spring, with what velocity does it slide across the table
A ring of radius R has uniform charge per unit lenght ? C/m (?>0), and z is the dince along its axis. Explain why the electric field must be zero at the center of the ring
A pitcher pitches the ball (m = 150 g) at 40.3 m/s. The batter makes contact with the ball for 0.001 s, Find the net average force on the ball
The density of water is about 1000 kg/m3 and the density of air is about 1 kg/m3.
A 360 kg piano slides 3.1 m down a 25 degree incline and is kept from accelerating by A man who is pushing back on it parallel to the incline, Determine the work done on the piano by the man
Two ideal inductors (0.124 H, 0.433 H) are connected in series to an AC voltage source with amplitude 5.17 V and frequency 113 Hz. What is the peak current that flows in the circuit
A wire whose resistance is R = 140 is cut into 9 equally long pieces, which are then connected in parallel. What is the resistance of the parallel combination
An alpha particle with a kinetic energy of 6.00MeV makes a head-on collision with a gold nucleus at rest. What is the distance of closest approach of the two particles
A 13.8-g piece of Styrofoam carries a net charge of -0.72 µC and is suspended in equilibrium above the center of a large, determine the charge per unit area on the plastic sheet
A capacitor consists of two concentric conducting spherical shells with radii R1 and R2 = 4.0R1. It has capacitance C = 4.0 pF, and is charged to a potential difference of 60.0 V. by what factor does the stored energy change
A women's high-heeled shoe has an area of 0.5 cm2. Assuming that the woman wearing the shoe has a mass of 52 kg, what is the pressure that the heel exerts on the floor
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