Physics Answers

A 50.0kg person accelerated from rest to 9.40m/s. Determine the work that must be done to accelerate this person.

Assume that rose has a mass of 63kg and jack has a mass of 75kg. How much do Rose and Jack each way?

a. Will a 1200-watt hair dryer operate on a 120-volt line if the current is limited to 15 amperes by a safety fuse? Can two hairdryers operate on this line?

b. Choose from 3A, 5A, 13A, and 30A: Which fuse is the most suitable for a circuit in which a refrigerator rated at 2.0 kW is to be connected to a 220 V supply?

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How much power is used by a calculator that operates on 8 volts and 0.1 amperes? If it is used for one hour, how much energy does it use?

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A. What is the resistance of an electric frying pan that draws 12 amperes of current when connected to a 120-volt circuit?

B. How much current is drawn by a lamp that has a resistance of 100 ohms when a voltage of 50 volts is impressed across it?

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A person pushing a lawnmower on a level lawn applies a constant force of 250 N at an

angle θ below the horizontal. If the person’s push does work of 1.06 x 10 4 J on the mower and the mower moves a distance of 44.5 m, what is the angle between the directions of the push and the displacement?

A copper rod is 2.4 meters long at 300K. What will be its length at 320K?

At what temperature is the reading in on the

Fahrenheit scale double that on the Celsius scale?

At what temperature is the reading on the Celsius scale the same as that on the Fahrenheit scale?

The temperature at the surface of the sun is 6000K. Convert this to Celsius, Fahrenheit, and Rankine.