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The loaded cab of an elevator has a mass of 3.0 x 103 kg and moves 176 m upthe shaft in 23 s at constant speed. At what average rate does theforce from the cable do work on the cab?
kW
A mass of 3.90 kg is suspended from a 1.55 m long string. It revolves in a horizontal circle. Calculate the angle between the string and the vertical
An object known to be made of copper (p=8.89 g/cm^3) and aluminum (p=2.7 g/cm^3) "weighs" 25 g in air but only 20 g in water. How much copper is in the object
q1. a snowmobile climbs a hill at velocity v-up. the slope of the hill is a 2 ft rise for every 70 ft of distance. the
Some bacteria are propelled by biological motors that spin hair-like flagella. How long does it take the motor to make one revolution
A spaceship is measured to be 186 m long while at rest relative to the observer. what length does the observer measure
A solid sphere has a temperature of 628 K. The sphere is melted down and recast into a cube that has the same emissivity and emits the same radiant power as the sphere. What is the cube's temperature?
A solid, frictionless cylindrical pulley with a mass of 3kg and a 0.420 m radius is used to draw water from a well. A 1.50kg bucket is attached to a cord that is wrapped around the pulley. If the bucket starts from rest at the top of the well and ..
Starting from rest, a car travels 1 350 meters in 1.00 minute. It accelerated at 1.0 m/s2 until it reached its cruising speed. What was its cruising speed
If the plant produces electric energy at the rate of 1.3GW , how much exhaust heat is discharged per hour
Cart A, with a mass of 2 kg, travels on a horizontal air-track at 3 m/s and hits cart B, which has a mass of 4 kg and is initially at rest. what is the speed of the center of mass of the two-cart system
An electric heater plugged into a 115-V AC outlet uses an average electric power of 1200 W. What are the rms current and the maximum instantaneous current through the heater
A 62 kg skier coasts up a snow-covered hill that makes an angle of 25° with the horizontal. What is the magnitude of the kinetic frictional force
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