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The proper length of one spaceship is five times that of another. The two spaceships are traveling in teh same direction and, while both are passing overhead, a spacestation based observer measures the two spaceships to have the same length. If the slower spaceship is moving with a speed of 0.30c, determine the speed of the other faster spaceship?
What is eccentricity of the transfer ellipse
A beaker of mass 1.5kg containing 3.2kg of water rests on a scale. A 3.2kg block of a metallic alloy of density 53400 kg/m is suspended from a spring scale is submerged in water of density 1000 kg/m.
He pushes just hard enough to get the desk moving and continues pushing with that force for 5.00 s. Explain how much work does he do on the desk?
If it started falling from an upright position, what was the initial angular acceleration of the structure? suppose that the bottom did not slide across the floor and that it did not fall out of plane; that is, during the fall, the structure remained..
In each cycle of its operation, a refrigerator removes 8 J of heat from the inside of the refrigerator and releases 22 J of heat into the room. How much work per cycle is necessary to operate this refrigerator.
A 60 kg skier skis a distance of d=200 m down a q=15o incline starting from rest. His speed at the bottom of the hill is 5 m/s. What was the NET work done on the skier
The bolts on a car wheel require tightening to the torque of 90 N•m. If a 30 cm long wrench is used, what is the magnitude of the force necessary when the force applied at 53° to the wrench.
What is least value for which stick remain in equilibrium
Two plates separated by a distance 18.3 mm are charged to a potential difference of 7.25 volts, Using the concept of work-energy, calculate the change in kinetic energy
Suppose a heat engine takes in 420 J of energy from a hot reservoir and performs 30 J of work in each cycle.
A uniform solid disk with a mass of 45.00 kg and a radius of 0.393 m is free to rotate about a frictionless axle. Forces of 90.0 and 125 N are applied to the disk.
A car is driving directly north on the freeway at a speed of 112 km/h, What is the velocity of the truck relative to the car
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