Polymer products with a triangular three-arrow recycle symbol with the number 02 in the center are made of
(a) Polyethylene terephthalate (PET)
(b) HDPE
(c) PVC
(d) PP
(b) HDPE
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What is the period of revolution of a planet in circular orbit around a star of 4.0 solar masses if it is at a distance from the star equal to that of the Earth from the Sun?
Which stars always have large positive absolute magnitude?
a. stars of high luminosity b. stars of low luminosity c. nearby stars d. distant stars e. not enough information given
Friction: A driver in a 1000-kg car traveling at 24 m/s slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the level road is 0.80, how long will the skid marks be?
A. 37 m B. 30 m C. 46 m D. 34 m
If the masses of two planets doubles and the distance between them also doubles, the force between them would be
A) one-quarter. B) half as much. C) twice as much. D) four times as much. E) none of the above