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A cord is used to vertically lower an initially stationary block of mass M = 14 kg at a constant downward acceleration of g/7. When the block has fallen a distance d = 3.5 m, find
(a) the work done by the cord's force on the block,
(b) the work done by the gravitational force on the block,
(c) the kinetic energy of the block, and
(d) the speed of the block. (Note : Take the downward direction positive)
You look through a Polaroid sheet at a 75 W light bulb 3.00 m away. Find the intensity of the light you see
A 400-kg piano slides 3.6 m down a 28 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. Determine the force exerted by the man
For a science experiment you need to electroplate a 120nm-thick zinc coating onto both sides of a very thin, 2.5cm X 2.5cm copper sheet. how long will it take the zinc to reach the desired thickness
A wave pulse travels down a slinky. The mass of the slinky is m = 0.93 kg and is initially stretched to a length L = 6.8 m. What is the wavelength of the wave pulse
An AC generator operates at 22 V and delivers 200 W of power through an ideal (no loss) transformer to the load with the resistance 4.0 \Omega
Analysis of Physics, Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches
A 2.70-kg object is moving in a plane, with its x and y coordinates given by x=7t^2-3 and y=2t^2+3, Find the magnitude of the net force acting on this object at t=1.60s
A fisherman's scale stretches 4.2 cm when a 2.6 kg fish hangs from it. What will be the amplitude and frequency of vibration if the fish is pulled down 3.0 cm more and released so that it vibrates up and down
An X-ray beam of wavelength 0.01nm strikes a target containing free electrons. determine The change in wavelength of the scattered x-ray
When this capacitor is discharged through the strobe lamp, it transfers all its energy in 1.0x10-4 s. Find the power delivered to the lamp
You and a friend are sitting in the bleachers of a major league baseball park, 120 m from home plate on a day when the temperature is 20° C. How much later does the other person hear the sound
A burglar alarm is wailing with a frequency of 1200 Hz. What frequency does a cop hear who is driving towards the alarm at a speed of 40.0 m/s
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