Plane A is flying at 440 mph in the northeast direction relative to the Earth. Plane B is flying at 550 mph in the north direction relative to the Earth. What is the speed of Plane B as observed from Plane A?
a. 570 mph
b. 916 mph
c. 392 mph
d. 704 mph
e. 714 mph
c
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According to Newton, the closer gravitationally interacting objects are to each other, theA) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them
A) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them.
Rubber rods charged by rubbing with cat fur repel each other. Glass rods charged by rubbing with silk repel each other. A rubber rod and a glass rod charged respectively as above attract each other. A possible explanation is that
a. Any two rubber rods charged this way have opposite charges on them. b. Any two glass rods charged this way have opposite charges on them. c. A rubber rod and a glass rod charged this way have opposite charges on them. d. All rubber rods always have an excess of positive charge on them. e. All glass rods always have an excess of negative charge on them.
If the intensity of a sound is increased by a factor of 1000, how is the decibel level changed? The new decibel level will be:
a. three units greater. c. thirty times greater. b. ten times greater. d. twenty units greater.
Which of the following statements is correct?
a. You only need to know the amount of thermal energy a body contains to calculate its temperature. b. The temperature of a body is directly proportional to the amount of work the body has performed. c. The quantity of thermal energy exchanged by two bodies in contact is inversely proportional to the difference in their temperatures. d. The quantity of thermal energy exchanged by two bodies in contact is directly proportional to the difference in their temperatures. e. Different amounts of thermal energy are transferred between two bodies in contact if different temperature scales are used to measure the temperature difference between the bodies.