Chemical energy is transformed into gravitational energy when
A) a leaf undergoes photosynthesis.
B) a person walks uphill.
C) water evaporates.
D) a car accelerates.
E) a block slides downhill.
B
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The fact that the weight of a brim-full container of water is unchanged whether or not something floats in it is nicely employed in
A) hydraulic devices. B) all floating devices. C) Scotland's Falkirk Wheel. D) none of the above
Life may be less likely around A- and F-type stars because
A) they emit large quantities of ultraviolet radiation B) they experience violent surface activity C) their habitable zones are very narrow D) rocky planets are unlikely to form around them
Two identical grasshoppers jump with the same initial speed. Grasshopper A goes straight up, but grasshopper B goes up at a 66° angle above the horizontal. Assume no air resistance and choose your system to be grasshopper-Earth
Which of the following statements about these grasshoppers are correct? (There could be more than one correct choice.) A) At their highest point, both systems have the same amount of gravitational potential energy. B) At their highest point, both systemshave the same amount of kinetic energy. C) At their highest point, both systemshave the same amount of mechanical energy. D) At their highest point, grasshopper B is moving faster than grasshopper A. E) At their highest point, the system grasshopper A-Earth has more gravitational potential energy than the system grasshopper B-Earth.
The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be 3 times the change in length of the Pyrex glass rod
a. True b. False Indicate whether the statement is true or false