Which of the following is an example of a reversible process?
A)
An ice cube at 0°C melts while in a water bath at 0°C.
B)
A hand pump is rapidly compressed and the pressure and temperature in the pump rise. The pump is held in position as the temperature drops to the ambient temperature.
C)
A stick of dynamite explodes.
D)
A high pressure air tank at room temperature has its valve opened and the gas in the tank rushes out until the pressure in the tank is equal to atmospheric pressure.
E)
A car engine burns fuel to produce motion of the car and exhausts the 140°C waste products of the combustion into the 20°C atmosphere.
A
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At a point in space where the magnetic field is measured, the magnetic field produced by a current element
a. points radially away in the direction from the current element to the point in space. b. points radially in the direction from the point in space towards the current element. c. points in a direction parallel to the current element. d. points in a direction parallel to but opposite in direction to the current element. e. points in a direction that is perpendicular to the current element and perpendicular to the radial direction.
Two nuclei collide, one originally at rest, in an endothermic nuclear reaction with Q = ?2.05 MeV. Which of the following describes the minimum kinetic energy needed in the reactant nuclei for the reaction is to occur?
a. equal to 2.05 MeV b. greater than 2.05 MeV c. less than 2.05 MeV d. exactly half of 2.05 MeV
Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of 2.1 × 10^2 m, how long does Superguy have to save Lois, and what must be his average speed?
a. 4.5 s, 200 m/s c. 7.0 s, 140 m/s b. 6.5 s, 150 m/s d. 9.0 s, 110 m/s
State the second postulate of the special theory of relativity (constancy of the speed of light)
What will be an ideal response?