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Two stars that are close together are photographed through a telescope using black and white film. The black and white film is equally sensitive to all colors. Why would it be best to use large lens, and have blue stars?
a puck of mass m 1.00 kg slides in a circle of radius r 23.0 cm on a frictionless table while attached to a hanging
What effect does temperature have upon surface tension? Is it better to wash clothes in hot water or cold water?
You throw it upward at an angle of 70 degrees and your teammate catches it at the top of their jump. Assume the ball and your teammate start at the same height, and your teammate jumps with an initial upward speed of 3.5 m/s. How fast must you thr..
while trying out for the position of pitcher on your high school baseball team you throw a fastball at 78.4 mih toward
A pulsar is a rapidly rotating neutron star that emits a radio beam the way a lighthouse emits a light beam. We receive a radio pulse for each rotation of the star. The period T of rotation is found by measuring the time between pulses. The pulsar..
A 30 kilogram child moving at 4 meters per second jumps onto a 50 kilogram sled that is initially at rest on a long, frictionless, horizontal sheet of ice determine the speed of the child sled system after the child jumps into the sled.
A flywheel in a motor is spinning at 580 {rm rpm} when a power failure suddenly occurs. The flywheel has mass 40 {rm kg} and diameter 75 {rm cm}.
A 5 N force acts on a 0.4-kg object for 0.3 seconds. By how much does the object's momentum change
The speed of sound in air at 20°C is 344 m/s. How many milliseconds does each vibration take
A weather balloon rises by the atmosphere, its volume expanding from 4.4m^3 to 10m^3 as temperature drops from 17 Degrees C to -13Degrees C.
An aluminum cylinder is suspended in an unknown fluid by a spring scale. Outside the fluid, the object weighs 20N. In the fluid,
A 50 kg steel file cabinet is in the back of a dump truck. The trucks bed, also made of steel, is slowly tilted. What is the size of the static friction force on the cabinet
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