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If two people were 15km apart, how long would it take light to make the round trip? How does this time compare with reaction times of 0.2s?
A current in magnetic filed experience a force. Therefore it should be possible to pump conducting liquids by sending a current through the liquid, what advantage would such a pump have
An unknown resistor R is connected to a 15.0 ? resistor, and the combination is attached to an ideal battery. Determine the two possible values for R
The threshold of dark-adapted (scotopic) vision is 8.0 ? 10-11 W/m2 at a central wavelength of 450 nm. how many photons per second enter the eye
Light of wavelength 500 nm illuminates a round 0.50-mm-diameter hole. find the width of the central bright circle on the screen
A person sitting quietly in a room on a winter day may lose heat primarily by radiation from the outer surface of her clothes to the walls of the room. what is the temperature of the outer surface of the clothes
A woman finds the front windshield of her car covered with iceat -13.8°C. How much heat is required to meltthe ice
A three-step cycle is undergone by 3.4 mol of an ideal diatomic gas: the temperature of the gas is increased from 210 K to 400 K at constanr volume, What is the efficiency of the cycle
The coefficient of thermal expansion describes how the size of an object changes with a change in temperature. Specifically, it measures the fractional change in size per degree change in temperature at a constant pressure. Several types of coeffi..
a tiny .5 kg object moves on a frictionlesshorizontal table in a circular path of radius 1.0 m the angular speed is 6.28 rad/s the object is attached to a string ofnegligible mass that passes through a small hole in the table atthe center of the c..
A 2.94g aluminum bullet at 31.0°C is fired at a speed of 236 m/s into a large block of ice at 0°C, in which it embeds itself. What quantity of ice melts
If a transformer steps the voltage down from 8800 V (at the pole) to 120 V (at the building) and it is to deliver 1000 kW to the building at 80% efficiency, what is the ratio of primary turns to secondary turns
A bullet is fired into a large stationary absorber and comes to rest. Temperature measurements of the absorber show that the bullet lost 2080 J of kinetic energy, What is the mass of the bullet
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