As a car moves forward on a level road at constant velocity, the total force acting on the tires is:
a. greater than the normal force times the coefficient of static friction.
b. equal to the normal force times the coefficient of static friction.
c. the normal force times the coefficient of kinetic friction.
d. zero.
D
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The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is
A) a continuum, strongest in the color red. B) a few bright lines against a dark background. C) a few dark lines in the continuum. D) a continuum, but with both bright and dark lines mixed in. E) not in the visible portion of the spectrum.
Halley's comet has an elliptical orbit around the Sun with a period of 76.0 years. At its closest approach (perihelion) it is 88.6 x 1010 m from the Sun and has a speed of 54.8 km/s
How far is it from the Sun at its furthest point (aphelion)? The mass of the Sun is 2.00 × 1030 kg and G = 6.67 x 10-11 N•m2/kg2. A) 12.8 × 1012 m B) 32.3 × 1012 m C) 5.42 × 1012 m D) 31.4 × 1012 m E) 52..3 × 1012 m
How many minor planets are known to exist in the solar system, using today's classification system?
a. 1 b. 3 c. 2 d. 4
If a point charge of -30 µC experiences an electrostatic upward force of 27 mN at a certain location in the laboratory, what are the magnitude and direction of the electric field at that location?
What will be an ideal response?