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A Carnot air conditioner maintains the temperature in a house at 294 K on a day when the temperature outside is 308 K. What is the coefficient of performance of the air conditioner?
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Question: A proton (with a rest mass m=1.67Ã-10âˆ'27kg) has a total energy that is 4.00 times its rest energy. a. What is the kinetic energy Ek of the proton? Express your answer in billions of electron volts to three si ...
Question: A steel cable with mass is lifting a girder. The girder is speeding up. Part A Draw a free-body diagram for the steel cable. Draw the vectors starting at the black dots. The location and orientation of the vect ...
Question: Suppose you have a block resting on a horizontal smooth surface. the block (mass m) is attached to a horizontak spring (spring constant k) which is fixed at one end. the mass is pulled to one side and released. ...
Question: In a semiclassical model of the hydrogen atom, the electron orbitsthe proton at a distance of 0.053 nm. What is the electric potential of the proton atthe position of the electron? What is the electron's potent ...
Question: The potential difference between the surface of a 3.2 cm -diameter power line and a point 1.5 mdistant is 4.7 kV. What is the magnitude of the line charge density on the power line? Express your answer using tw ...
Question: For a patient, a doctor prescribes glasses with a converging lens having a power of 4.0 D. Is the patient nearsighted or farsighted? The response must be typed, single spaced, must be in times new roman font (s ...
Question: A solid disk of mass m1 = 9.6 kg and radius R = 0.24 m is rotating with a constant angular velocity of ? = 30 rad/s. A thin rectangular rod with mass m2 = 3.4 kg and length L = 2R = 0.48 m begins at rest above ...
Question: A roller coaster car crosses the top of a circular loop-the-loop at twice the critical speed. What is the ratio of the car's apparent weight to its true weight? The response must be typed, single spaced, must b ...
How are chemical and physical changes different. What are some demonstrations that you might do to help your students differentiate between a chemical and physical change?
Question: The radius of the earth's orbit around the sun (assumed to be circular) is 1.5*10^8 km , and the earth travels around this orbit in 365 days. a) What is the magnitude of the orbital velocity of the earth in m/s ...
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