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Suppose that electrical attraction, rather than gravity, were responsible for holding the Moon in orbit around the Earth. If equal and opposite charges Q were placed on the Earth and the Moon, what should be the value of Q to maintain the present orbit? Use these data; mass of Earth = 5.98 X 1024 kg, mass of Moon = 7.35 X 1022 kg, radius of orbit = 3.84 X 108 m. Treat the Earth and Moon as point particles.
The rms current in a 44-? resistor is 0.50 A. What is the peak value of the voltage across this resistor
A particular race car can cover a quarter mile track (402 m) in 6.20 s starting from a standstill. what horizontal force must the road exert on the tires
Give examples of two objects that have different positions but undergo identical displacements. Please give another or a couple of examples other than a group of choreographed stage dancers.
A hot (70°C) lump of metal has a mass of 250g and a specific heat of 0.25 cal/g°C. John drops the metal into a 500 g calorimeter containing 75g of water at 20°C.
Two trains are traveling toward each other at 30.5 m/srelative to the ground. One train is blowing a whistle at 500Hz. What frequency is heard on the other train in still air
Bill measures the rate at which the clock in sam's spaceship runs and finds that it is 1/3 the rate at which the same clock runs when it is at rest
A 800kg , light-weight helicopter ascends from the ground with an acceleration of 3.50m/s2. What is the work done by the net force on the helicopter?
A 60 kg person jumps from rest off a 5m high tower straight down into the water. obtain the average force that the water exerts on the diver
A thin spherical shell has a radius of 2.8 m and a mass of 410 kg, and its center is located at the origin of a coordinate system. Another spherical shell with a radius of 1 m and mass 165 kg is inside the larger shell with its center at 0.6 m on the..
A simple harmonic oscillator takes 12 s to undergo 5 complete vibrations. Find (a) the period of its motion, (b) the frequency in hertz and (c) the angular frequency in radians per second.
The length of a simple pendulum is 0.73m, the pendulum bob has a mass of 307 grams, and it is released at an angle of 12° to the vertical. With what frequency does it vibrate? Assume SHM. What is the pendulum bob's speed while it passes through th..
A 1.80-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 6.00sin(2?t), Find the resonance angular frequency of the system
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