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The space between the plates of a capacitor is filled with water. By what factor does the water change the capacitance relative to that found when the plates are filled with air?
A standard baseball has a circumference of approximately 23 cm. If a baseball had the same mass per unit volume as a neutron or a proton, about what would its mass be?
A 170-turn circular coil has diameter 5.05cm and resistance 1.20? . A magnetic field perpendicular to the coil is changing at 1.20T/s
A diver runs horizontally with a speed of 0.767 m/s off a platform that is 8.40 m above the water. What is his speed just before striking the water?
A 2.40 bucket containing 11.5 of water is hanging from a vertical ideal spring of force constant 115 and oscillating up, What is the shortest period this system can have
It is proposed that future space stations create an artificial gravity by rotating. What rotation period will provide "normal" gravity
a boy pulls a loaded wagon having a total mass m=100kg. He applies a constant force F=100N along the handle at 30 degrees, compute the horizontal force on the wagon
A copper beaker of mass 0.20 kg contains 0.10 kg of water at 20.0degree C. A block of silver of mass 100 g at 90.0 degree C is added to the beaker of water. The entire system is thermally insulated from the surroundings, (specific heats- copper: 3..
During exercise, a person may give off 182 kcal of heat in 30 min by evaporation of water from the skin. How much water has been lost
An ideal transformer steps down 120V to 12V and the 2630 turn secondary supplies 12 A. What is the ratio of output power to input power
A 0.145- kg baseball traveling 34.50 m/s is stopped in 0.183 s by a catcher's mitt. What is the average force on the catcher's mitt
Two identical piano wires have a fundamental frequency of 640 Hz when kept under the same tension. What fractional increase in the tension of one wire would lead to the occurrence of 10 beats/s when both wires oscillate simultaneously.
A laser emits a narrow beam of light. The radius of the beam is 9.6 mm, and the power is 1.9 mW. What is the intensity of the laser beam
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