An astronomical telescope has an objective lens with focal length fo and has an eyepiece with focal length fe. A second telescope has objective and eyepiece lenses with half the focal length of the first telescope. Which telescope gives the greater magnification and by what factor?
a. The second telescope gives 4 times the magnification of the first.
b. The first telescope gives 4 times the magnification of the second. c. The actual focal lengths must be known to answer this question.
d. Both telescopes give the same magnification.
D
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A billiard ball is moving in the x direction at 40.0 cm/s and strikes another billiard ball moving in the y direction at 30.0 cm/s. As a result of the collision, the first ball moves at 50.0 cm/s, and the second ball stops. What is the change in kinetic energy of the system as a result of the collision?
a. 0 c. some negative value b. some positive value d. No answer above is correct.
Pascal's Principle: A 500-N weight sits on the small piston of a hydraulic machine. The small piston has an area of 2.0 cm2. If the large piston has an area of 40 cm2, how much weight can the large piston support? Assume the pistons each have negligible weight.
A. 25 N B. 500 N C. 10,000 N D. 40,000 N
The particle that orbits the central core inside an atom is the
a. electron b. proton c. neutron d. nucleus e. none of the above
A solid object floats in water with three-fourths of its volume beneath the surface. What is the object's density? The density of water is 1000 kg/m3
A) 1333 kg/m3 B) 1000 kg/m3 C) 750 kg/m3 D) 250 kg/m3