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A secret communist spacecraft is observed approaching earth at 0.500c along a straight line from mars to earth.
1.) What distance does the spacecraft observe between mars and earth if earth based measurements show a distance between those objects of 40.0 million miles?
2.) The spacecraft prepares its nuclear weapons during a 20.0 minute warm up time measured in their frame of reference. How long is earth's measurement of their warm up time?
3.) The spacecraft launches a missile towards earth at a velocity of 0.900c measured relative to their ship. What speed does an earth based measurement show for the approach of the missile?
a tunnel under a river is 2km long. at what frequencies can the air in the tunnel resonate? explain whether it would be
A 560N force is pulling a 105.0kg crate across a horizontal floor. The force acts at an angle of 34.0o above the floor. find the work done by the pulling force
An electron traversing a resistor in an electronic circuit has no more kinetic energy when it exits the resistor than it had when it entered the resistor; however, this electron certainly has lost electrical potential energy. Explain this paradox
A 70 kg astronaut floating in space in a 110 kg MMU (manned maneuvering unit) experiences an acceleration of 0.029 m/s2 when he fires one of the MMU's thrusters. What is the thrust of the thruster
A playground carousel is free to rotate regarding its center on frictionless bearings, and air resistance is negligible. The carousel itself (without riders) has a moment of inertia of 120kg·m 2 . When one person is standing at a distance of 1.50 m f..
Suppose a car is traveling at +22.5 m/s, and the driver sees a traffic light turn red. What is the stopping distance of the car
A 95 g ice cube at 0°C is heated until 85 g has become water at 100°C, How much energy was added to accomplish the transformation
Runner A is at first 6.60 km west of a flagpole and is running with a constant velocity of 6.4 km/h due east. Runner B is firstly 7.20 km east of the flagpole and is running with a constant velocity of 8.80 km/h due west.
The loaded cab of an elevator has a mass of 3.0 x 10^3 kg and moves 145 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab.
A cameraman on a pickup truck is traveling westward at 24 km/h while he videotapes a cheetah that is moving westward 25 km/h faster than the truck. Abruptly, the cheetah stops, turns, and then run at 42 km/h eastward, as gauged by a suddenly nervous ..
place a test lead in one of the big lab magnets and plug both ends in the voltmeter so that it measures voltage on the
Sound is passing perpendicularly during an open window whose dimensions are 1.1 m x 0.75 m. The sound intensity level is 86 dB above the threshold of human hearing. How much sound energy comes during the window in one hour?
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