A boat moves at 10.0 m/s relative to the water. If the boat is in a river where the current is 2.0 m/s, how long does it take the boat to make a complete round trip of 1.00 km upstream followed by a 1.00 km trip downstream?
208 s
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Hydrostatic equilibrium refers to the balance between weight and pressure
a. True b. False Indicate whether the statement is true or false
An ideal gas is compressed isothermally from 30 L to 20 L. During this process, 6 J of energy is expended by the external mechanism that compressed the gas. What is the change of internal energy for this gas?
A) +6 J B) zero C) -6 J D) +12 J E) -12 J
A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the momentum during the collision are correct? (There could be more than one correct choice.)
A) The momentum of the truck is conserved. B) The momentum of the car is conserved. C) The car and the truck must undergo the same change in speed. D) The momentum of the car and the momentum of the truck are each conserved. E) The momentum of the car-truck system is conserved, but the momentum of each one separately is not conserved.
Two coherent sources emit waves of 2.0-m wavelength in phase. If the path length to an observer differs by ________, then _________ interference occurs.
A. 1.0 m, constructive B. 2.0 m, destructive C. 3.5 m, constructive D. 7.0 m, destructive E. 8.0 m, destructive