In Example Suppose the rod stays on the wall in the same position, but the hinge is moved to be at the center of mass position of the rod. The rod is then held out horizontally and released. How do the energiesof the system change after the rod is released? Check all that apply.
a. The change in the system’s gravitational potential energy would be zero
b. The change in the system’s gravitational potential energy is positive
c. The change in the system’s gravitational potential energy is negative
d. The change in the system’s kinetic energy would zeroThe change in the system’s kinetic energy is positive
e. The change in the system’s Kinetic energy is negative
Answers: 3
Physics, 22.06.2019 14:30
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Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of
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Physics, 22.06.2019 18:00
Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)
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Physics, 22.06.2019 19:20
The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?
Answers: 1
In Example Suppose the rod stays on the wall in the same position, but the hinge is moved to be at t...
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