An object's "momentum" is defined as
A) its force time is velocity.
B) its mass times its speed.
C) its force times its distance.
D) its mass times its velocity.
E) its weight times its speed.
D
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If we define the gravitational field 
, where 
is a unit radial vector, then Gauss's law for gravity is
A.
.B.
.C.
.D.
.E.
.Moment of Inertia: The L-shaped object shown in the figure consists of three small masses connected by extremely light rods. Assume that the masses shown are accurate to three significant figures. What is the moment of inertia of this object (a) about the x-axis, and (b) about the y-axis?
What will be an ideal response?
Ptolemy was important in the history of astronomy because he
A) developed a model of the solar system that made sufficiently accurate predictions of planetary positions to remain in use for many centuries. B) developed the first scientific model of the universe. C) was the first to create a model of the solar system that placed the Sun rather than the Earth at the center. D) was the first to believe that all orbits are perfect circles.
What is the resolving power of a diffraction grating that is capable of just distinguishing between two wavelengths of 568.20 nm and 569.60 nm? (1 nm = 10?9 m)
a. 1.10 b. 406 c. 487 d. 812 e. 568.9