Physics, 28.09.2020 23:01 shellxavier1
Consider an elevator in a tall building. The elevator is initially at rest on a floor that is neither the highest nor
lowest floor, At time t = 0, the doors of the elevator begin to close. The acceleration of the elevator from time
= 0 to time - 25 seconds is shown in the graph above. Let the positive direction be upward.
(a)
Is the elevator moving upward, moving downward, or at rest at time t = 12 seconds? If the elevator is
moving, state its speed. In any case, explain your reasoning.
(b)
Is the elevator moving upward, moving downward, or at rest at time t = 22 seconds? If the elevator is
moving, state its speed. In any case, explain your reasoning.
Answers: 1
Physics, 22.06.2019 03:50, am2garcia5
A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c
Answers: 3
Physics, 22.06.2019 11:30, ramirezzairap2u4lh
Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)
Answers: 3
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