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A hot-air balloon is accelerating upward under the influence of twoforces, its weight and the buoyant force. For simplicity, considerthe weight to be only that of the hot air within the balloon, thusignoring the balloon fabric and the basket. The hot air inside theballoon has a density of ρhot air = 0.80kg/m3, and the density of the cool air outside isρcool air = 1.29 kg/m3. What is the acceleration of the rising balloon?
A solid uniform 3.25 kg cylinder, 65.0 cm in diameter and 12.4 cm long is connected to a 1.5kg weight over two massless frictionless pulleys. How fast is the cylinder turning at this instant
Radius=10m Vt=12.3 If at point A the track exerts a force on the car that is 2.92 × 10^4 N greater than the car's weight, what is the mass of the car.
A 200g hockey puck is launched up a metal ramp that is inclined at a 30° angle. What speed does the puck have when it slides back down to its starting point
a how much energy is stored in a 11.2 mh inductor carrying a 1.50a current?b how much current would the inductor
A 1000 ? resistor is joined in series with a 600m H inductance and a 24 Volts battery. What is the time constant of the circuit
A plate carries a charge of -4 ?C, while a rod carries a charge of 2.50 ?C. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge?
Zach, whose mass is 64kg , is in an elevator descending at 10m/s. What is Zach's apparent weight while the elevator is braking
during the time 0.315 mol of an ideal gas undergoes an isothermal compression at 21.0degc 530 j of work is done on it
The 1994 Winter Olympics included the aerials competition inskiing. In this event skiers speed down a ramp that slopes sharplyupward at the end. The sharp upward slope launches them into the air, where they perform acrobatic maneuvers.
a closed wire loop is in the shape of a right triangle with sides 12cm 12cm and 12 sqrt 2 cm. the loop lies in the
A rock is thrown off a bridge of height 75m. at an angle theta=25 degrees with respect to the horizontal. The initial speed of the rock is 15 m/s. compute the maximum height reached by the rock?
An electric motor turns a flywheel by a drive belt that joins a pulley on the motor and a pulley that is rigidly attached to the flywheel. The flywheel is a solid disk with a mass of 50.0kg and a diameter of 1.00m.
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