Describe the two categories of pumps discussed in the text
What will be an ideal response?
A vacuum pump is designed to reduce the pressure (usually of air) in a given vessel. A force pump, on the other hand, is a pump that is intended to increase the pressure - for example, to lift a liquid or push a fluid through a pipe.
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What do we mean by the straightest possible path along Earth's surface between two points on Earth's surface?
A) a path that actually is a perfect straight line B) a path that follows a circle of latitude C) a path that follows a circle of longitude D) a path that crosses the equator E) the shortest path between the two points
Do you think it is possible that a 1-solar-mass horizontal branch star could harbor an advanced civilization? Explain your reasoning
What will be an ideal response?
"Firewalkers" step on the hot ashes and coals from a wood fire without getting their feet burned. How might this be possible?
a. They have magical powers. b. The ashes are poor conductors of heat. c. They do get burned but enjoy the publicity. d. none of the above
A heavy box is located in the center of the cargo hold of a train. There are no other boxes or items in the cargo hold and there are no straps holding the box down. The train accelerates along the track in the northward direction. The direction of the friction force exerted by the floor of the cargo hold on the box is
1.upward. 2.none; no friction force exists because the box is not sliding. 3.to the north. 4.to the south.