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1. An ice chest is maintained at 0 degrees Celsius by ice placed in it. The chest is cubical with each inside wall having an area of 1200cm^2 and a thickness of 4cm. Each wall is made of foam plastic with k= 1.3X10^-4 cal/cm/s/C. How much ice will melt in the chest in an hour when the outside temperature is 24 degrees Celsius?
2. How many tons of refrigeration would be needed to change .1m^3 of water to ice (all at 0 degrees Celsius) in a time of 1 hour?
3. A certain heat pump uses 1000W and delivers heat at a rate of 600 cal/s.
a) How many calories of heat does the pump extract each second from the outside?
b) What is its coefficient of performance?
When these two wires are connected in equivalent to the same battery, describe the reasoning of the steps that allow you to find out which of these wires will consume the greater amount of power by warming up and dissipating this energy as heat.
The angle of incidence of a light beam in air onto a reflecting surface is continuously variable. find the index of refraction of the reflecting material
Batman whose mass is 80 kg is dangling on the free end of a 12 m rope, the other end of which is fixed to a tree limb above. How much work was done by the gravitational force on Batman in this maneuver
The heaviest invertebrate is the giant squid, which can have a weight of about 1.5 tons spread out over its length of 70 feet. What is its weight in newtons
A jet airplane is in level flight. The mass of the airplane is m = 8850 kg. What is the magnitude of the lift force acting on the plane
The intake in the figure has cross-sectional area of 0.79 m2 and water flow at 0.44 m/s. What is the pressure difference between inlet and outlet
Solar Cell A solar cell generates a potential difference of 0.10 V when a 600 resistor isconnected across it, and a potential difference of 0.15 V when a1150 resistor is substituted. What is the emf of the solar cell?
the kinetic energy of a particle is equal to the energy of a photon. the particle moves at 4.2 of the speed of light.
An air puck of mass m1 = 0.15 kg is tied to a string and allowed to revolve in a circle of radius R = 1.1 m on a frictionless horizontal table. What is the horizontal force acting on the puck
when an object falls and hits the floor without bouncing off the floor the normal force of the floor on the object
A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, What is the initial angular velocity of the turbine
If twice the force is exerted over twice the distance, how does the resulting increase in kinetic energy compare with the original increase in kinetic energy?
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