You have available lenses of focal lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16 cm
If you could use any two of these lenses to build a telescope, what is the lens separation for the telescope to provide the maximum magnification for comfortable viewing of a planet? A) 10.0 cm
B) 12.0 cm
C) 18.0 cm
D) 24.0 cm
C
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If an astronaut with a weight of 800 N on Earth steps on a bathroom scale while he is in Earth orbit, the scale will read
A. zero. B. less than 800 N. C. 800 N. D. more than 800 N.
A small dust particle of mass 7.90 × 10-6 g is being observed under a magnifying lens. Its position is determined to within 0.0050 mm. (1 y = 3.156 × 107 s, h = 6.626 × 10-34 J ? s)
(a) Find the minimum uncertainty in its velocity implied by the uncertainty in its position. (b) Assuming the dust particle is moving at the speed you just found, how many years would it take for the particle to move 1.0 mm? What will be an ideal response?
Jupiter's magnetic field is much stronger than Earth's, and has a magnetic tail that extends beyond the orbit of Saturn
Indicate whether the statement is true or false
Consider some material that has been cooled until it has become a superconductor. If it is cooled even further its resistance will:
a. stay constant and non-zero. c. decrease. b. increase. d. None of these choices.