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1. A heat pump with a coefficient of performance of 7.30 is used to heat a small house at a rate of 40.0 × 103 Btu/h. What horsepower electric motor is required to drive the heat pump?
2. It is proposed to operate a reversed Carnot cycle to remove 1500. W of thermal energy from a freezer at -14.0°C and to discharge heat to the environment at 20.0°C. Determine
a. The coefficient of performance of the system.
b. The heat transfer rate to the environment.
c. The required input power.
A small device based on the confinement of a proton in a 1 dimensional box is found to have a ground (i.e. n = 1) level energy of 16.9 keV. Determine the width of the box
an object with a mass of 4kg is on a table and 2m away from another object with mass 10kg. find the center of gravity of these objects
A meterstick is initially balanced on a fulcrum at its midpoint. You have four identical masses. Where should the fourth mass be placed in order to balance the meterstick
A 17.6kg dog is running northward at 2.87m/s , while a 6.33kg cat is running eastward at 3.99m/s. Find the direction of the owner's velocity
Describe mathematically what it means for two operators to commute. Describe the experimental implications when two operators commute and when they do not. Give an example of each.
A rod of length 0.850 m is attached to a pivot at one end. A force F of 2.30 N is applied to the end of the bar opposite the pivot. The force makes an angle of 65.0o with the bar. (The ? in the figure is the angle for the "line of action" of the f..
What is the smallest division can read from the a) meter stick, b) Veinier caliper and c) micrometer which devise is more reliable
Atypical sprinter speeds up through the first third of a race and slows gradually over the rest of course. Is it accurate to say that a sprinter is accelerating as he slows through the final two-thirds of the race?
A mover has to move a heavy sofa of mass 143 kg to the second floor of the house. He uses a rope to pull the sofa up a ramp from the first to the second floor. find the tension in the rope
An RC series circuit has R = 71.0 \Omega and C = 550 nF. The series combination is connected across a 250 V (rms), 64 Hz power supply. Find the impedance of the RC combination
An MRI patient is placed in a magnetic field of 0.40T. The resistance of the body is 3200 ohms and the area on the body of the person in the field is 1.02m^2. The Dr. performing the diagnoses just for fun increases the magnetic field intensity to ..
A ball is thrown from the brink of a cliff 15.0 m high with an initial velocity of v0 = 7.0 m/s at an angle q0 = 26.0 o above the horizontal. How long does it take to land
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