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A bucket of water with a total mass of 23 kg is attached to a rope, which in turn, is wound around a 0.050 m radius cylinder at the top of the well. A crank with a turning radius of 0.25 m is attached to the end of the cylinder. What minimum force directed perpendicular to the crank handle is required to just raise the bucket? (Assume the rope's mass is negligible, that cylinder turns on frictionless bearings, and that g = 9.81 m/s^2.)
A small object of mass 3.60 g and charge -19 µC is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. What are the magnitude and direction of the electric field
What is the acceleration of a car that moves at a steady velocity of 100 km/h for 100 second? Explain your answer and state why this question is an exercise in careful reading as well as in physics.
A stone is thrown straight up with a speed of 25.0 m/s from the top of a building 55.0 m tall. How far above the ground will the stone go
Two light bulbs use 30 W and 60 W, respectively, when connected in parallel to a 120-V source. How much power does each bulb use when connected in series across the 120-V source, assuming that their resistances remain the same?
A satellite circles the earth in an orbit whose radius is 2.78 times the earth's radius. What is the period of the satellite
A 2110-kg test rocket is launched vertically from the launch pad. Its fuel (of negligible mass) provides a thrust force so that its vertical velocity as a function of time is given by v(t)=At+Bt^2, What was the initial thrust due to the fuel
What is the magnitude of the apparent weight of a 68kg astronaut 2600km from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 2.1m/s2
The current in a 50.0 mH inductor changes with time as I = 2t2 - 5t (in SI units). At what time is the emf zero
If there is no change in the power of the engine, and no change in the resistive forces acting on the car, estimate what is the new speed of the car on hill
the material for the bolt shown in the angled joint has an ultimate tensile stress 600 MPa and a shear strength of 250 MPa. the diameter of the bolt is 10mm. determine the factor safety. assume F=9kn
imagine a very heavy cube of pure gold that is 1.40 m on a side. approximate the atoms in this cube as little cubes.
A lid is put on a box that is 18 cm long,17 cm wide, and 8.0 cm tall and the box is then evacuated until its inner pressure is 8.7 104 Pa. How much force is required to lift the lidat sea level?
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