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The length of a moving spaceship is 25.6 m according to an astronaut on the spaceship. If the spaceship is contracted by 15.5 cm according to an Earth observer, what is the speed of the spaceship?
A 0.75m diameter solid sphere may be rotated about an axis through its center by a torque of 11.5m*N which accelerates it uniformly from rest through a total of 180 revolutions in 16.0 s.What is the mass of the sphere.
A pair of in-phase stereo speakers is placed side by side, 2m apart. You stand directly in front of one of the speakers, 5m from the speaker. What do you hear.
Speedboat A negotiates a curve whose radius is 150m. Speedboat B negotiates the curve whose radius is 190m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
How various kilograms of nitrogen are boiled away in time of 7.50 h. car that hits a line of water barrels and takes 1.8s to stop.
Light from the sun allows a solar cell to move electrons from the positive to the negative terminal, determine the emf of this solar cell
A 78-kg man standing on a scale in an elevator notes that as elevator rises, the scale reads 834 N. What is the acceleration of the elevator.
Show that the force between parallel wires carrying currents I1 and I2, both in the same direction, find the magnetic force on segment dI2 of wire 2.
A coin placed 29.0 cm from the center of a rotating, horizontal turntable slips when its speed is 50.2 cm/s, What is the coefficient of static friction between coin and turntable
A 280-kg piano slides 4.3 m down a 30o incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.
If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710 m, throughout how various revolutions will the rotor turn before coming to rest.
As you sit facing your computer screen, electrons are directed from a source at the back of the computer toward you and are deflected by a magnetic field. Which direction must the magnetic field be oriented in order to direct the electrons to the ..
Calculate charges, current, potential difference.
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