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If a soldier shoots an enemy with the intent of killing him, he wants the bullet to deliver maximum energy. On the other hand, if he wants to merely knock someone down (say for dispersing a riot) he wants the bullet to deliver maximum force. To see that these are not the similar considerations, calculate the energy transferred to a very massive wooden block, and the average force exerted on the block when a bullet of mass 0.008 kg and a velocity of 400 m/s makes a collision of duration 6.0 ms. Think a rubber bullet that bounces back with no loss in speed (elastic collision) and an aluminium bullet which embeds itself in the block (completely inelastic collision)
A 120 g copper calorimeter cup contains 185 cm3 of water and 25 g of ice, all in thermal equilibrium. What was the initial temperature of the iron
When an ambulance is stationary, the siren gives off a sound at a frequency of 500 Hz. What is the frequency of the stationary siren as perceived by an observer
a 3.20 v battery and a 1.10 v battery each with an internal resistance of 5.00 omega are connected in parallel. that is
A raindrop falls at a constant speed. How much work is done byair resistance as the drop falls 250 m? (The raindrop's mass is 3 x10^-5 kg)
An observer in frame S standing at the origin observes two flashes of colored light separated spatially by ?x = 2980 m, Find the magnitude and direction of v.
a ocean waves move toward the beach with a speed of 8.90 ms and a crest-to-crest separatiion of 15.0 m. you are in a
Two speakers, one directly behind the other, are each generating a 295-Hz sound wave. What is the smallest separation distance between the speakers that would produce destructive interference at a listener standing in front of them? Take the speed..
A sign (mass 1700kg ) hangs from the end of a vertical steel girder with a cross-sectional area of 0.013m^2, What is the stress within the girder
q1. a wire of mass 1 g and length 58 cm is stretched with a tension of 480 n. it is then placed near the open end of
A physics professor is pushed up a ramp inclined upward at an angle 28.0 above the horizontal as he sits in his desk chair that slides on frictionless rollers. Use the work-energy theorem to find his speed at the top of the ramp
Two parallel square metal plates (side length: 13 cm) are separated by a dielectric material with a dielectric constant 3.9 and a thickness of 2.4 mm. Find the energy stored on the capacitor
A resistor with R=300 ? and an inductor are connected in series across an ac source that has voltage amplitude 500 V. What is the amplitude of the voltage across the inductor
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