Physics, 02.08.2019 21:30 jojo492192
Ncold climates, including the northern united states, a house can be built with very large windows facing south to take advantage of solar heating. sunlight shining in during the daytime is absorbed by the floor, interior walls, and objects in the room, raising their temperature to 39.0°c. if the house is well insulated, you may model it as losing energy by heat steadily at the rate 6 875 w on a day in april when the average exterior temperature is 4°c and when the conventional heating system is not used at all. during the period between 5: 00 p. m. and 7: 00 a. m., the temperature of the house drops and a sufficiently large "thermal mass" is required to keep it from dropping too far. the thermal mass can be a large quantity of stone (with specific heat 850 j/kg · °c) in the floor and the interior walls exposed to sunlight. what mass of stone is required if the temperature is not to drop below 20.0°c overnight?
Answers: 3
Physics, 22.06.2019 04:00
Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?
Answers: 1
Physics, 22.06.2019 06:40
How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.
Answers: 1
Physics, 22.06.2019 12:00
Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?
Answers: 1
Physics, 22.06.2019 14:40
The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.
Answers: 1
Ncold climates, including the northern united states, a house can be built with very large windows f...
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