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A hot-air balloon plus cargo has a mass of 1740kg and a volume of 11730m3. The balloon is floating at a constant height of 6.25 m above the ground. What is the density of the hot air in the balloon?
In a period of 9.00 s, 9.40x1023 nitrogen molecules strike a section of a wall with an area of 2.00 cm2. what is the pressure exerted on the wall
The fan blades on a jet engine make one thousand revolutions in a time of 81.8 ms. What is the angular frequency of the blades
A string has a linear density of 5.7 x 10-3 kg/m and is under a tension of 400 N. The string is 1.4 m long, determine frequency of the traveling waves that make up the standing wave
An automobile club plans to race a 710 kg car at the local racetrack. The car needs to be able to travel around several 160 m radius curves at 93 km/h. What must the banking angle of the curves be so that the force of the pavement on the tires of ..
Santa loses his footing and slides down a frictionless, snowy roof that is tilted at an angle of 29.0 degrees. what is his speed as he leaves the roof
A 1.9x10^14 Hz electromagnetic wave propagates in carbon tetrachloride with a speed of 2.05x10^8 m/s
A torque of 2.2 N.m is applied to a spherical shell of radius 0.25 m. what is the mass of the disk
The engineer takes 0.400 seconds to react, and then applies the brakes. At what rate must the passenger train then decelerate in order to avoid a collision?
A rectangular sample of a metal is 3.5 cm wide and 475 µm thick. When it carries a 42 A current and is placed in a 0.8 T magnetic field it produces a 6.5 µV Hall emf, Determine the Hall field in the conductor
On a clear day the electric ?eld in the atmosphere near the earth's surface is 100 N/C, What is the potential at the top of a man's head if the man is 2 m tall and is standing
A doubly charged helium atom whose mass is 6.6 10 to 27 kg is accelerated by a voltage of 2200 V. What will be its radius of curvature if it moves in the plane perpendicular to a uniform 0.308 T field?
A copper block is removed from a 300°C oven and dropped into 1.00 kg of water at 20.0°C. The water quickly reaches 26.5°C and then remains at that temperature. What is the mass of the copper block?
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