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From the top of a tall building, you drop two table-tennis balls, one filled with air and the other with water. Both experience air resistance as they fall. Which ball reach-es terminal velocity first? Do both hit the ground at the same time?
A piece of string 5.30 m long has a mass of 14 g. What must the tension in the string be to make the wavelength of a 128 Hz wave 120 cm.
Assume the skin temperature of a naked person is 34° C when the person is standing inside a room whose temperature is18° C. The skin area of the individual is 1.4 m2. Assuming the emissivity is 0.80, find the net loss of radiant power from the body.
A piece of Nichrome wire has a radius of 7.00 10-4 m. It is used in a laboratory to make a heater that dissipates 3.00 102 W of power when connected to a voltage source of 120 V. Ignoring the effect of temperature on resistance, estimate the necessar..
If the phase angle for a block-spring system in SHM is π/8 rad and the block’s position is given x = xm cos(ωt + ?),what is the ratio of the kinetic energy to the potential energy at time t = 0?
You have a beach ball which has a radius of 11 cm and a mass of 0.3 kg. You have a lead ball which has the same radius but has a mass of 120 kg. What is the buoyancy force felt by the beach ball
A ruby laser emits an intense pulse of light that lasts a mere 10 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 400 mJ. How many photons are emitted in each pulse
Keeping a constant speed of 0.6 m/s, a marble of mass 18 g rolls back & forth across a shoebox that is 14 cm high & 2 mm thick. Estimate the probability of its escaping through the wall of the box by quantum tunnelling.
A 5.60kg block hangs from a spring with spring constant 2120N/m . The block is pulled down 5.20cm from the equilibrium position, What is the total mechanical energy of the motion
An MP3 player operates with a voltage of 3.7 V, and is using 0.28 W of power. Find the current being supplied by the player's battery.
A train is slowing down from 46 m/s to 12 m/s in 9.0 s. Assume constant acceleration. How far did it travel in this time
The supersonic aircraft Concorde has a length of 63.0 when sitting on the ground on a typical day when the temperature is 16.0. What is the temperature of the Concorde's skin in flight
Astronauts walking on the Moon are seen "bounding" rather than walking normally. Why?
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