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a freezer with a coefficient of performance of 3.88 is used to convert 1.75 kg of water to ice in one hour. The water starts at a temperature of 20.0 degrees celcius, and the ice that is produced is cooled to a temperature of -5.00 degrees celcius.
(a) how much heat must be removed from the water for this process to occur?
(b) how much electrical energy does the freezer use during this hour of operation?
(c) how much heat is discarded into the room that houses the freezer?
A person with mass mp = 72 kg stands on a spinning platform disk with a radius of R = 1.74 m and mass md = 195 kg. find the centripetal acceleration of the person
Two wires on a piano are the same length and are stretched to the same tension. Wire 1 vibrates at a frequency 1.5 times that of wire 2. Calculate the ratio of their masses (m1/m2).
A jogger on a circular track that has the radius of 0.150km runs a distance of 1.10km. What angular distance does the jogger covers in radians.
The wave reflects from the speeder's car and returns to the police car, where its frequency is measured to be 280 Hz less than the emitted frequency. Find out the speeder's speed with respect to the ground.
A 20 kg crate is pushed across the floor at a constant velocity of 4 m/s with a force of 100 N. How much energy is lost to heat in the first ten seconds
A bumper car with mass m1 = 115kg is moving to the right with a velocity of v1 = 4 m/s. A second bumper car with mass m2 = 95 kg is moving to the left with a velocity of v2 = -3.7 m/s. The two cars have an elastic collision. Suppose the surface is fr..
If I end up with a velocity of 1 m/s going west, am I heaver or lighter than you? What is your mass, and what is your final velocity?
Conclude the electric field at the origin
Speedy Sue, driving at 34.0m/s, enters a one-lane tunnel. She then observes a slow-moving van 175m ahead traveling with velocity 5.40 m/s. Sue applies her brakes but can accelerate only at 2.00 m/s2 since the road is wet. Will there be a collision..
In February 2004, scientists at Purdue University used a highly sensitive technique to measure the mass of a vaccinia virus (the kind used in smallpox vaccine). What is the mass of the virus in femtograms
Ignoring the container and the equilibrium vapor pressure of the liquid at 51.5 °C, find out the ratio of the mass of steam to the mass of ice. The specific heat capacity of steam is 2020 J/(kg C°).
You travel to an alien planet. The local population tries very hard to tell you what gravity is on the surface. You cannot understand them, and do not have a tool to calculate gravity directly. You also ran out of water. They offer a liquid to you, o..
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