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A spacecraft is in a circular orbit about the moon, 1.03 x 105 meter above its surface. The speed of the spacecraft is 1770 meter per second, and the radius of the moon is 1.74 x 106 meter. If the moon were a smooth, reflective sphere:
(a) determine how far below the moon's surface would the image of the spacecraft appear?
(b) Find the apparent speed of the spacecraft's image? (Hint: both the spacecraft and its image have the same angular speed about the center of the moon.)
Two people carry a heavy electric motor by placing it on a light board 2.30m long. One person lifts at one end with a force of 420N , find Where is its center of gravity located
A rocket is launched at an angle of 59° above the horizontal with an initial speed of 97 m/s. The rocket moves for 3s along its initial line of motion with an acceleration of 28m/s2.
A bat moving at 15.0 {\rm m/s} emits a high-frequency sound as it approaches awall that is 29.5 m away. how far away is it when it receives the echo
A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s. How much work is done by the dissipative (air) resistive force on the object through this descent?
A proton and an alpha particle (charge = 2e, mass = 6.64 10-27 kg) are initially at rest, separated by 2.30 10-15 m. What are both of their speeds at infinity
A proton with an initial speed of 800000 m/s is brought to rest by an electric field. What was the potential difference that stopped the proton
A transformer for an answering machine takes an acvoltage of amplitude 150 V as its inputand supplies a 7.9 V amplitude to the answering machine. The primary has 400turns.
A rope is wrapped around a wheel of diameter 50 centimeter. The wheel is mounted with frictionless bearings on an axle through its center. Calculate the linear acceleration of the falling block
What must be the resistance of a heating coil which will be utilized to raise the temperature of 500 g of water from 28 degrees C to the boiling point in 2.0minutes, assuming that 25 % of the heat is lost? The heater operates on a 110-V line.
How many liters of gasoline would give the same mechanical energy given that each liter provides 8.50x10^6 J of mechanical energy.
How many drops of water are in all the oceans on earth? Assume that contains 25 drops of water. Remember that this is an order-of-magnitude problem, so you should expect that you will only find rough estimates for the numbers you require.
What is the magnitude of the electric field at the centre ofa square of side 45.00 cm if one corner is occupied by a chargeQ1 = 20.00 uC and the other three corners areoccupied by three charges each of charge Q2=-20.00 uC.
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