A person is nearsighted with a near point of 75. cm. (a) What FOCAL LENGTH is this? (b) What POWER lens is needed to correct their nearsightedness (assuming distance from lens to eye is negligible)?
What will be an ideal response?
(a) -75. cm
(b) -1.33 Diopters
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Burl and Paul have a total weight of 1300 N. The tensions in the supporting ropes that support their scaffold add to 1700 N. The weight of the scaffold itself must be
A) 300 N. B) 400 N. C) 500 N. D) 600 N.
X-rays are scattered by _________on the atoms in the sample.
Fill in the blank(s) with the appropriate word(s).
____________________ are groups of 100,000 to 1,000,000 population II stars firmly bound by gravity
Fill in the blank(s) with correct word
Impulse: A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 × 10-26 kg, and each one strikes the umbrella (without rebounding) with a speed of 2.0 m/s in the same direction, how many atoms strike the umbrella each second? Assume that the wind blows horizontally so that the gravity can be neglected.
What will be an ideal response?