A 1.0-kg block of copperat 30°C is dropped into a large insulated calorimeter containing liquid nitrogen at 77.3 K. How many kilograms of nitrogen boil away by the time the copper block reaches 77.3 K?The latent heat of vaporization of nitrogen is 199 J/g, its boiling point is 77.3 K, and the specific heat of copper is 0.386 J/(g°C)
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Physics, 22.06.2019 15:40
If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.
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Physics, 22.06.2019 17:30
This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.
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Physics, 22.06.2019 18:30
Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?
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Physics, 22.06.2019 22:30
Determine the net charge of the predominant form of arg at (a) ph 1.0, (b) ph 5.0, (c) ph 10.5, and (d) ph 13.5
Answers: 2
A 1.0-kg block of copperat 30°C is dropped into a large insulated calorimeter containing liquid nitr...
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