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A 1000-W motor power a hoist used to lift cars at a service station.
a) Determine how much time would it take to raise a 1,200 kg car2m?
b) If it is replaced with a 2,000W motor, determine how long would it take?
Sam, whose mass is 71.0kg , takes off down a 45.0m high, 8.00? slope on his jet-powered skis. What is the coefficient of kinetic friction of his skis on snow
A small object is placed to the left of a convex lens and on the optical axis. What is the position of the image formed by the lens
A 581-{\rm N} physics student stands on a bathroom scale in an 821-{\rm kg} (including the student) elevator that is supported by a cable. Find the magnitude of the acceleration of the elevator
Physics two skaters with masses of 65 kg and 45 kg, respectively stand 8.0 m apart each holding one end of a rope. If they pull themslevles along the the rope until they meet explain how far does each skater travel?
Jack and Jill exercise in a 25.0-m-long swimming pool. Jack swims nine lengths of the pool in 159.5 seconds, while Jill, the faster swimmer, covers ten lengths in the same time interval. Find the average velocity and average speed of each swimmer.
What is the maximum speed of the car (in km/hr) in the similar turn in the rain, when the coefficient of static friction is reduced to 0.720.
NASA launched the Near Earth Asteroid Rendevous (NEAR), which,after traveling 1.3 billion miles, What will be the peroid of NEAR as it orbits Eros
The suspended 2.8 kg mass on the right is moving up on a pulley, the 1.6 kg mass slides down the 21 degree ramp, and the suspended 9 kg mass on the left is moving down on a pulley. The coefficient of friction between the block and the ramp is 0.12..
Consider an airplane window (area 0.34 m2). If the pressure inside the plane is atmospheric pressure and the pressure outside is 18% of Patm, what is the force on the window
Standing on ground 3.5 from the wall of a building, you want to throw a package from your 1.6 shoulder level to someone in a second-floor window 4.5 above the ground.
I put a packing peanut on top of it, and it only took one rotation--or crank--to knock the material off from the machine and onto the ground. mass of the peanut=.001 kg, distance from the machine to the peanut=.0005m.
Liquid isobutane is throttled through a valve from an initial state of 360 K and 4000 kPa to a final pressure of 2000 kPa. Estimate the temperature change and the entropy change of the isobutane. The specific heat of liquid isobutane at 360 K is 2.78..
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