Which of the following statements best describes what is "relative" in the theory of relativity?

A) The theory says that everything is relative.
B) The theory says that truth can never be established in any absolute sense.
C) The theory says that measurements of motion make sense only when we state what they are measured relative to.
D) The theory says that the speed of light is relative and depends on who is measuring it.
E) The theory says that all scientific results must be considered within the context of the scientists' individual viewpoints.

C

Physics & Space Science

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A pipe of diameter three cm is replaced by one of the same length but of diameter six cm. If the pressure difference between the ends of the pipe remains the same, by what factor is the rate of flow of a viscous liquid through it changed?

a. 2 b. 4 c. 8 d. 16 e. 32

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A small sphere of initial volume V is filled with n moles of helium at initial pressure and temperature P and T. Which of the following statements is true?

n/2 moles of gas are removed, the volume is decreased to V/2, and the pressure decreases to P/4 with a drop in temperature of T/2

The volume decreases to V/2, and the pressure increases to 4P when the temperature is T/2 n moles of gas are added, the total sample is heated to 2T, and the pressure drops to P/2 when the volume increases to 8V The amount of gas is doubled to 2n, the pressure is doubled to 2P, and the volume is doubled to 2V, with a corresponding temperature drop to T/2

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Tensile Stress and Strain: Which of the following are SI units of Young's modulus? (There could be more than one correct choice.)

A. N/m ? s2 B. kg/m2 C. kg ? m/s2 D. kg/m ? s2 E. kg ? m2/s2

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A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A horizontal 140-N force is applied to the box. What is the friction force on the box?

A) 140 N B) 42 N C) 16.5 N D) 160 N E) 0.00 N

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Physics & Space Science