Which of the following is a general difference between a planet and a star?
A) Stars shine with energy released by nuclear fusion while planets shine primarily with light reflected from stars.
B) Stars are found in galaxies, but planets are not part of galaxies.
C) Stars are made of gas and planets are made of rock.
D) Stars are stationary while planets orbit stars.
A) Stars shine with energy released by nuclear fusion while planets shine primarily with light reflected from stars.
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Which gas gives the characteristic odor to smelling salts and some household cleaners?
a. Ammonia b. Carbon dioxide c. Chlorine d. Ozone
______________materials are made of at least two separate materials that maintain their identity in the combined material.
Fill in the blank(s) with the appropriate word(s).
A uniform 135-g meter stick rotates about an axis perpendicular to the stick passing through its center with an angular speed of 3.50 rad/s. What is the magnitude of the angular momentum of the stick?
A) 0.0739 kg ? m2/s B) 0.0394 kg ? m2/s C) 0.158 kg ? m2/s D) 0.0236 kg ? m2/s E) 0.473 kg ? m2/s
A uniform solid sphere of mass 1.5 kg and diameter 30.0 cm starts from rest and rolls without slipping down a 35° incline that is 7.0 m long. (a) Calculate the linear speed of the center of the sphere when it reaches the bottom of the incline
(b) Determine the angular speed of the sphere about its center at the bottom of the incline. (c) Through what angle (in radians) does this sphere turn as it rolls down the incline? (d) Does the linear speed in (a) depend on the radius or mass of the sphere? Does the angular speed in (b) depend on the radius or mass of the sphere?