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In a science fiction novel, a starship takes three days to travel between two distant space stations according to its own clocks. Instruments on one of the space stations indicate that the trip took four days. How fast did the starship travel, relative to the space station?
A set of crash tests consists of running a test car moving at a speed of 13.0 m/s (28.6 m/h) into a solid wall. Calculate the size of the average force which acts on the dummy during that time
A 0.15 kg ball is placed in a shallow wedge with an opening angle of 150.For each contact point between the wedge and ball, find out the force exerted on the ball. Assume the system is frictionless.
A proton accelerates from rest in a uniform electric field of 620 N/C. At some later time, its speed is 1.16 106 m/s. what is the magnitude of acceleration of the proton
A radiator with a constant temperature of 150o C has a surface area of 5.00 m2. Calculate its rate of heat loss by radiation to the environment
The coil of a galvanometer has a resistance of 19.8 ?, and its meter deflects full scale when a current of 6.30 mA passes through it. What is the maximum current that this ammeter can read
If a chain of 35 identical short springs linked end-to-end has a stiffness of 400 N/m, what is the stiffness of one short spring
A tuning fork is set into vibration above a vertical open tube filled with water, What is the frequency of the tuning fork
What is the smallest number of whole logs (? = 725 kg/m3, radius = 0.0917 m, length = 3.10 m) that can be used to build a raft that will carry four people
A flat cylindrical grinding wheel is spinning at 2000 rpm (clockwise when viewed head-on) when its power is suddenly turned off. Normally, How much work was done by friction on the system
questionthe michelson interferometer can be used to measure an index of refraction of a gas by placing the evacuated
Using energy considerations, compute the average force the beam exerts on the pile driver while the pile driver is brought to rest.
A single loop of copper wire moves at an unknown constant speed v into a region of uniform magnetic field B = 5.00 T. Calculate the induced current in the copper wire loop
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