The concept that the direction of observation does not matter overall is:
A) relativity.
B) homogeneity.
C) universality.
D) isotropy.
E) geometry.
D
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Thin Lenses: If a single lens forms a virtual image of an object, then
A. the lens must be a diverging lens. B. the lens must be a converging lens. C. the lens could be either a diverging or a converging lens. D. the image must be inverted. E. the object must be between the lens and its focal point.
The Big Bang predicts that the universe should be 25 percent hydrogen and 75 percent helium
Indicate whether the statement is true or false
A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about
A) 0.5 J. B) 1.0 J. C) 1.5 J. D) 2.0 J. E) more than 2.0 J.
A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P = 5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force
P between A and B?
a.
2.7 J
b.
1.0 J
c.
2.2 J
d.
1.6 J
e.
3.2 J