Conversion of Units: Express 50 mi/h in units of meters per second. (1 mi = 1609 m)
A. 49 m/s
B. 2.2 m/s
C. 22 m/s
D. 45 m/s
Answer: C
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A 25-kg television set rests on four rubber pads that are on the floor, each one having a height of 1.0 cm and a radius of 0.60 cm. A horizontal force is applied to the television set
When the pads are just at the point of sliding over the floor, how far has the television set moved sideways due to the deformation of the pads? The coefficient of static friction between the rubber and the floor is 1.0 and the shear modulus of these rubber pads is 2.6 × 106 Pa. A) 4.2 mm B) 16 mm C) 2.1 mm D) 8.4 mm E) 1.1 mm
Consider the use of the terms "rotation" and "revolution". In physics:
a. the words are used interchangeably. b. the words are used interchangeably but "rotation" is the preferred word. c. the words have different meaning. d. "rotation" is the correct word, and "revolution" should not be used.
Two identical conducting spheres A and B carry equal charge and exert electrostatic forces of magnitude F on each other. They are separated by a distance much larger than their diameters. A third identical conducting sphere C is uncharged. Sphere C is first touched to A, then to B, and finally removed. As a result, the electrostatic force between A and B becomes:
A) F/2 B) F/4 C) 3F/8 D) F/16 E) 0
Low mass stars like our Sun can fuse in their cores
A) all of the chemical elements B) elements up to and including iron C) elements up to and including carbon D) only elements heavier than iron