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A hot-air balloon is rising straight up with a speed of 1.47 m/s. Aballast bag is released from rest relative to the balloon when itis 9.87 m above the ground. How much time elapses before the ballast bag hits the ground?
A spherical balloon of volume 3.94 103 cm3 contains helium at a pressure of 1.15 105 Pa. How many moles of helium are in the balloon
A heat pump with a cop of 1.8 supplies energy to a house at a rate of 75000 kJ/h. Determine the electric power drawn by the heat pump and the rate of heat removal from the outside air
The blackbody radiation emitted from a furnace peaks at a wavelength of 3.4 10-6 m(0.0000034 m). What is the temperature inside the furnace
A 1.80 kg block slides on a rough, horizontal surface. The block hits a spring with a speed of 1.80 m/s and compresses it a distance of 11.0 cm before coming to rest. If the coefficient of kinetic friction between the block and the surface is µk = 0...
A beam of laser light with a wavelenth of ? = 590.00 nm passes through a circular aperture of diameter a = 0.163 mm. What is the angular width of the central diffraction maximum
A 200-loop coil of cross sectional area 8.5 cm2 lies in the plane of the paper. Directed out of the plane of the paper is a magnetic field of 0.06 T. What is the average voltage induced as the flux is changing
The weight of passengers on a roller coaster increases by 60% as the car goes through a dip with a 30m radius of curvature
A person walks first at a constant speed of 4.80 m/s along a straight line from point a to point b, What is her average speed over the entire trip
A circular saw blade accelerates from rest to an angular speed of 3620 rpm in 6.3 revolutions. Find the torque exerted on the saw blade
Two trains, each having a speed of 38 km/h, are headed at each other on the identical straight track. A bird that can fly 70 km/h flies off the front of one train while they are 68 km apart and heads directly for the other train. On reaching other tr..
It takes 23 hours 56 minutes and 4 seconds for the earth to make one revolution (mean sidereal day). What is the angular speed of the earth
A 0.50 kg object on a 40 cm long string swings in a circle, on horizontal table, fritionless table. what is Tangential velocity of the block
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