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a hydraulic jack has an in[put piston area of 2 cm^2 and an output piston area of 18 cm^2. What input force is needed to lift a 72,000 N load? What will be the pressure on the oil?
A child complains that her milk is too hot. It is indeed too hot at 90o C. what is the temperature of the mixture
How much heat flows from 1.00 kg of water at 46.0°C when it is placed in contact with 1.00 kg of 22°C water in reaching equilibrium, What is the change in entropy due to this heat transfer
A mortar crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action.
A lead ball is dropped into a lake from a diving board 5.6 above the water. After entering the water, it sinks to the bottom with a constant velocity equal to velocity with which it hit the water. The ball reaches the bottom 5 after it is released..
A transformer has 100 turns in the primary with a voltage of 100V, and 200 turns in the secondary with a voltage os 200V. what will be the current in the secondary
A spherical steel shell with shell thickness 10 mm rolling down the ramp without slipping.assume that the density of aluminum.
Two nonconservative forces are present: friction does -2.00 104 J of work on the car, and a chain mechanism does +3.00 104 J of work to help the car up a long climb. Illustrate what is the change in the car's kinetic energy, ΔKE = KEf - KE0, fro..
The Boeing 777 aircraft has a takeoff mass of 255000kg and a takeoff speed of 115m/s, What airflow speed across the top of the wing is necessary for the plane to fly
The maximum speed of a 2.6-kg mass attached to a spring is 0.74 m/s, and the maximum force exerted on the mass is 11 N. What is the force constant of the spring
A 0.14 kg baseball moves horizontally with a speed of 27 m/s toward a bat. find magnitude of the impulse delivered to the ball by the bat
Tarzan swings through the jungle by hanging from a vine. Immediately after he steps off the branch, is Tarzan's acceleration zero or nonzero
A photon with an initial wavelength of 1.150×10-11 m Compton scatters from an electron which is initially at rest. What is the energy of the incoming photon
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