The U.S. national debt is about $6 trillion. Expressed in powers of ten, this is
A) $6 × 106. B) $6 × 109. C) $6 × 1015. D) $6 × 1012. E) $6 × 1010.
D
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According to Galileo, inertia is a
A) force like any other force. B) special kind of force. C) property of all matter. D) concept opposite to force.
Astronaut Jill leaves Earth in a spaceship and is now traveling at a speed of 0.280c relative to an observer on Earth. When Jill left Earth, the spaceship was equipped with all kinds of scientific instruments, including a meter stick
Now that Jill is underway, how long does she measure the meter stick to be? A) 1.00 m B) 0.960 m C) 1.04 m D) 0.280 m E) 1.28 m
A uniform pressure of 21 × 10^5 N/m2 is applied to all six sides of a copper cube. What is the percentage change in volume of the cube? (for copper, B = 14 × 10^10 N/m2)
a. 2.4 × 10^-2 % c. 8.4 × 10^-2 % b. 1.5 × 10^-3 % d. 0.5 × 10^-3 %
The figure below represents a string which has a heavy section and a light section. The mass per unit length of the heavy section is 16 times as large as the mass per unit length of the light section. When the string is under tension, the speed of a pulse traveling in the heavy section is ____ times the speed of that same pulse traveling in the light section.
A.
B.
C.
D.
E.