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Consider a refrigerator whose dimensions are 1.8 m x 1.2 m x 0.8 m and whose walls are 3 cm thick. The refrigerator consumes 600 W of power when operating and has a COP of 1.5. It is observed that the motor of the refrigerator remains on for 5 min and then is off for 15 min periodically. If the average temperatures at the inner and outer surfaces of the refrigerator are 6°C and 17°C, respectively, determine the average thermal conductivity of the refrigerator walls. Also, determine the annual cost of operating this refrigerator if the unit cost of electricity is $0.08/kWh.
A 32000-kg railroad freight car collides with a stationary caboose car. What is the mass of the caboose
A circular loop of flexible iron wire has an initial circumference of 169cm, but its circumference starts to decrease at a constant rate of 10.0cm/s due to a tangential pull on the wire. What is the direction of the induced current in the loop
Suppose we have a solid with a constant volume consisting of N particles. find the number of microstates
A car is driving directly north on the freeway at a speed of 106 km/h and a truck is leaving the freeway driving 91 km/h in a direction that is 40° west of north. What is the velocity of the truck relative to the car
While completing the experiment Charges and Fields, make sure to keep the following guiding questions in mind: What does it mean for a quantity to "drop off"? And r², r³, or even faster
An 830 kilogram race car can drive around an unbanked turn at a maximum speed of 58 m/s without slipping. Obtain what would be the maximum speed if no down force acted on the car
A coin placed on a turntable rotating at 34.1 rev/min will stay there if its center is placed no further than 10.0 cm from the axis of rotation, What is the coefficient of friction between the coin and turntable
Two children setup a "telephone" by placing a long, slender aluminium (Y = 6.9 × 1010 N/m2) bar that has a length of 6.1-m between their two houses. To communicate, the child taps a coded message on one end. How long do the sound waves take to reach ..
An electron has a kinetic energy of 4.7 x 10-17 J. Determine the radius of the path
Instantaneous speed The instantaneous speed is the speed that something has at any instant of time. The speed measured by a radar gun is very close to instantaneous speed. The car speedometer is also very close to the instantaneous speed because t..
A baseball is thrown from the roof of a 22.0m tall building with an initial velocity of magnitude 12.0 m/sec, What is the speed of the ball just before it strikes the ground? Use energy methods and ignore air resistance
A factory worker pushes a 31.4 kg crate a distance of 5.00 m along a level floor by pushing downward at an angle of 28.0degrees below the horizontal. How much work is done on the crate by the force of friction
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