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You have decided to make a large cooler to store meat. In order to estimate the cost of the cooling unit required you decide to model your cooler as a styrofoam rectangular prism with the following interior dimensions: 3.0 m length, 2.5 m width, 2.0 m height. Wall thickness is 15 cm. You can ignore any edge eects to simplify your problem.
1. Calculate the net rate of heat flow per second out of the cooler if the interior temperature is 5 C and the exterior temperature can be 45 C.
2. Suppose you purchase a heat pump with a COP of 2.8. What power rating should the pump have to cool your cooler?
High speed stroboscopic photographs show that the head of a 181 g golf club is traveling at 55.4 m/s, Find the speed of the golf ball just after impact
Three point charges are placed at the corners of an isosceles triangle. At the left and right end points of the base are 6 micro coulomb and 6 micro coulombrespectively, What is the magnitude of the electric field at the midpoint of the baseline
The radius of Venus's orbit is 0.72 times that of Earth's orbit. How much stronger is the Sun's gravitational field at Venus than at the earth.
You are to build a box whose height is 0.280 times its length. In order for the box to have a given volume while using a minimum amount of cardboard, what should be the ratio of the width of the box to its length.
The skis have a thrust of 220 N. Sam's speed at the bottom is 45.0 {rm m/s}. Illustrate what is the coefficient of kinetic friction of his skis on snow?
A weightlifter stands up at constant speed from a squatting position while holding a heavy barbell across his shoulders, Draw a free-body diagram for the weight lifter
On a cool morning, while the temperature is 12.0 deg Celsius, you measure the pressure in your car tires to be 20psi. After driving 40.0 mi on the freeway, the temperature of your tires is 56deg Celsius. What pressure will your tire gauge now show..
a small motor draws a current of 1.75 A from a 120.0 V line. It costs $35.81 to operate the motor for 4.00 hrs at $0.0600 /kWh. What is the power output of the motor
A fun-loving 11.4 {rm kg} otter slides up a hill and then back down to the same place. If she starts up at 5.75 {rm m/s} and returns at 3.75 {rm m/s}, how much mechanical energy did she lose on the hill.
A radio controlled car increases its kinetic energy from 4J to 12J over the distance of 2 m. What was the average net force on the car during this interval.
A vessel whose walls are thermally insulated contains 2.00 of water and 0.550 of ice, all at a temperature of 0.0. The outlet of a tube leading from a boiler in which water is boiling at atmospheric pressure is inserted into the water.
Explain the rule of subtracting two vectors in graphical and component representation, ow the position of an object changes in time in case of linear motion
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