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Water from a fire hose is directed horizontally against a wall at a rate of 1.15 kg/s and a speed of 11.7 m/s. Calculate the magnitude of the force exerted on the wall, assuming the water's horizontal momentum is reduced to zero when it strikes the wall.
Calculate the minimum value of the tangential velocity at the top needed to stay in a circular trajectory. Making use of the result of the previous question, use conservation of energy to find the tangential speed of the stone at the bottom.
A 87-kg snow skier is being pulled up a 10 ° slope by a steel (Young's modulus 2.0 x 1011N/m2) cable. what is the original (unstretched) length of the cable
What do understand by the collision? When we say that there is a collision between two bodies or objects? What does the collision mean in our daily life?
A beam of light traveling in air strikes the surface of mineral oil at an angle of 20.7° with the normal to the surface. find the index of refraction of mineral oil
Galaxy C moves away from galaxy B in the same direction at 0.701 of the speed of light. How fast does galaxy C recede from galaxy A? Express your answer as a fraction of the speed of light.
A TV commercial claims that a car can speed up from rest to 60mph in 4.4s. If this is true, how many g's is the car's average acceleration
The electric potential energy stored in the capacitor of a defibrillator is 68 J, and the capacitance is 120 µF. What is the potential difference across the capacitor plates
Suppose that a particle accelerator is used to move two beams of particles in opposite directions. In a particular region, electrons move to the right at 9350 m/s and protons move to the left at 1.230 × 103 m/s.
As an object moves with constant acceleration. At t=0 the position is x=0. At t=1 the position is x=1 and at t=2 the position is x=5. What is the acceleration
The current in a 120-V reading lamp is 2.1 A. If the cost of electrical energy is $0.075 per kilowatt-hour, How much does it cost to operate the light for an hour
Determine the maximum thermal efficiency of this plant.- Its maximum thermal efficiency if the boiler is operated at 600. psia and 1000.°F and no throttling occurs at the entrance to the turbine.
A girl is skipping stones across a lake. One of the stones accidentally ricochets off a toy boat that is initially at rest in the water. Find the mass of the boat
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