A magnifying lens of power d (in diopters) gives what magnification when the viewing eye is relaxed assuming a near point of 25 cm?
a. 25d
b. 0.25/d
c. d/4
d. The correct answer is not given.
c
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In the light curve below, what is the period of the eclipsing binary?
a. 5 days
b. 32.5 days
c. 7.5 days
d. 42.5 days
e. 50 days
A complex tone can be produced by combining two or more __________
Fill in the blank(s) with correct word
The Moon does not fall to Earth because
1) the net force on it is zero. 2) it is being pulled by the sun and planets as well as Earth. 3) it is beyond the main pull of Earth's gravity. 4) but it does fall! More specifically, the Moon 5) is subject to both centripetal and centrifugal forces. 6) interacts with all massive bodies, both near and far. 7) is free of air resistance as well as other Earthly influences. 8) continually falls around Earth rather than straight into it.
A 25-kg television set rests on four rubber pads, each one having a height of 1.0 cm and a radius of 0.60 cm. A 200-N horizontal force is applied to the television set
How far does it move sideways due to the deformation of the rubber pads if the pads do not slide on the floor? The shear modulus of these rubber pads is 2.6 × 106 Pa. A) 6.8 mm B) 1.3 mm C) 3.4 mm D) 1.5 mm E) 1.7 mm