Which would have the lower average molecular speed?
(i) a sample of hydrogen gas, H2, at 0°C
(ii) a sample of oxygen gas, O2, at 100°C
1.(i)
2.(ii)
3.They have the same average molecular speed.
4.It is impossible to tell.
2
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The habitable zone is the area around a star where:
A) planets with life have been found. B) human beings could live. C) the Greenhouse Effect is possible. D) a planet could have an atmosphere. E) temperatures are suitable for planets to have liquid water.
A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on top. A large load of coal is suddenly dumped into the car. What happens to the speed of the freight car?
A) It increases. B) It remains the same. C) It decreases. D) It becomes zero. E) Cannot be determined from the information given.
When the sum of the external forces and the sum of the external torques on a body are both zero, we can conclude that
a. the body is moving at constant velocity but is not rotating. b. the body is rotating at constant angular velocity but has no linear velocity. c. the body has neither linear nor angular velocity. d. the body may have constant linear or angular velocity, but not both simultaneously. e. the body may have constant linear or constant angular velocity, or both simultaneously.
You carry a 20 N box 5 m horizontally across a room. The work you do is 100 N-m
Indicate whether the statement is true or false