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A kid of mass 20kg is playing with a swing with an arm length of 5 m. His sister first pushes him such that the maximum angular deviation from vertical position is 0.2 radian (11.46 deg.). The kid then enjoys the swing as it oscillates. After ten cycles, the maximum angular deviation is reduced by a factor of e. What is the quality factor Q of the swing? If the sister has to push the kid on every cycle to maintain a constant maximum angular deviation of 11.46 deg., how much work must the sister do on the kid on every push?
An electromagnetic wave has an electric field amplitude of475 V/m. What is the magnetic fieldamplitude associated with this wave?
The coefficient of static friction between the stone and each side of the tread channel is 0.7. While the tire surface is rotating at a maximum speed of 1 m/s, the stone flies out of the tread. The magnitude FN of the normal force that each side of t..
To a fish, the 4.20 mm thick aquarium walls appear to be only 3.80 mm thick. What is the index of refraction of the walls
A fountain designed to spray a column of water 10 m into the air has a 3 cm diameter nozzle at ground level. find the necessary absolute pressure the pump must exert
Blood flows through a vein at a rate of 3.5 mL/s. Among other things, it contains a protein with a molecular weight of 63,000, at a concentration of 2.9 g per 150 mL. How many grams of this protein are carried by the blood each second?
What is the effective resistance of a parallel combination of a very large resistance and a very small resistance, what will be the current through each resistor
A half-Atwood's machine consists of two masses, m1 = 8 kg and m2 = 5 kg, which are connected by a light string that passes over a pulley. what speed will it have just before hitting the floor
A pulsar is an extremely dense neutron star which is a highly magnetized. As it rotates it emits a beam of electromagnetic radiation which can sweep across the earth at very regular intervals. by what amount would the pulsar radius have had to shri..
A catapult launches a rock at a 30 degree angle with respect to thehorizontal. Find the maximum height attained if the speed of therock at its highest point is 30 m/s
A subatomic particle moves during the laboratory at 0.85 . Laboratory experimenters measure its lifetime, from creation to annihilation, to be 2.0. What is the recessional speed of the quasar as gauged by astronomers in the other galaxy?
Suppose the 6.0-V battery is replaced by a battery of unknown emf, and an ammeter measures I1 = 1.2 A. Find the other two currents and the emf of the battery
If the range of the projectile is 2.39 m, the time-of-flight is T = 0.919 s, and air resistance is turned off, determine the following. What is the launch angle of the projectile
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