Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistivities of these two wires compare?
A) The longer wire has 9 times times the resistivity of the shorter wire.
B) The longer wire has 27 times times the resistivity of the shorter wire.
C) The longer wire has 3 times the resistivity of the shorter wire.
D) Both wires have the same resistivity.
D
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The coefficient of volume expansion of a certain olive oil is 0.68 × 10-3 K-1. A 1.0-L glass beaker is filled to the brim with olive oil at room temperature
The beaker is placed on a range and the temperature of the oil and beaker increases by 25 C°. As a result, 0.0167 L of olive oil spills over the top of the beaker. Which of the following values is closest to the coefficient of linear expansion of the glass from which the beaker is made? A) 1 × 10-6 K-1 B) 4 × 10-6 K-1 C) 1 × 10-5 K-1 D) 2 × 10-5 K-1 E) 3 × 10-5 K-1
Two objects are in all respects identical except for the fact that one was coated with a substance that is an excellent reflector of light while the other was coated with a substance that is a perfect absorber of light
You place both objects at the same distance from a powerful light source so they both receive the same amount of energy U from the light. The linear momentum these objects will receive is such that: A) The reflecting objects receives a larger amount of momentum. B) Both objects receive the same amount of momentum. C) The reflecting object receives a smaller amount of momentum. D) None of the previous answers is correct.
A molecule takes 3.0 seconds to diffuse across a membrane. If the thickness of the membrane is doubled, then how long does it take the molecule to diffuse across the thicker membrane?
A. 30 hours B. 24 hours C. 20 hours D. 18 hours E. 12 hours
What is the maximum radiation pressure exerted by sunlight in space (S = 1 350 W/m2) on a highly polished silver surface?
a. 1.4 × 10^-2 Pa b. 0.12 Pa c. 9.0 × 10^-6 Pa d. 4.5 × 10^-5 Pa e. 2.3 × 10^-6 Pa