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You are going to lift an elephant (mass = 2.6 103 kg) over your head (1.9 m vertical displacement).
(a) Calculate the work required to do this. You will lift the elephant slowly (no tossing of the elephant allowed!). If you want, you can use a pulley system. (This does not change the energy required to lift the elephant, but it definitely reduces the force required to do so.)
(b) How many doughnuts (260 food calories each) must you metabolize to supply the energy for this feat? (Assume the body converts 100% of the food energy into mechanical energy.)
An object with a mass of m = 4.6 kg is attached to the free end of a light string wrapped around a reel of radius R = 0.265 m, determine the velocity when it hits the floor
A 10m^3 tank of compressed natural gas has an absolute pressure of 400 kPa at a temperature of 27 C. What is the mass of the gas in the tank
A uniform cylindrical turntable of radius 1.80 m and mass 25.2 kg rotates counterclockwise in a horizontal plane with an initial angular speed of 4pi rad/s. Find the final angular speed of the clay and turntable
If we drop a small metal sphere into the water and watch its motion, it will quickly reach terminal velocity. what is the Reynold's number of this sphere
A 3.00-kg block starts from rest at the top of a 29.0° incline and slides 2.00 m down the incline in 1.65 s. Find the frictional force acting on the block
A solid metal sphere of radius a = 1.30 cm is surrounded by a concentric spherical metal shell of inner radius b = 1.90 cm and outer radius c = 2.40 cm. What is the surface charge density, sc, on the outer surface of the outer spherical conductor
In a common but dangerous prank, a chair is pulled away as a person is moving downward to sit on it, causing the victim to land hard on the floor.
Your temperature is 98.4 degrees fahrenheit. what is the wavelength corresponding to the largest intensity
Two charged plates create a potential difference of 190 V. At a point halfway between the plates an electron is released from rest. What was the initial speed and direction of the proton
A spring with spring constant 19 hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. It is then pulled down 2.5 and released. The ball makes 33 oscillations in 15 seconds. What is its utmost speed.
An plane and pilot have a total mass of 168 kg. While executing a banked curve of radius 20 m at a speed of 12 m/s
Your are sitting in your car, which is standing at the side of the road with the engine idling. After what distance will you catch up with your classmate
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