There is almost no hydrogen gas in the atmosphere because
A. it escapes the Earth's gravity
B. there is very little hydrogen in the oceans or land
C. hydrogen molecules move slower than oxygen and nitrogen
D. hydrogen has all sunk to the Earth's core
Answer: A. it escapes the Earth's gravity
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A mass is suspended vertically from a spring so it is at rest at the equilibrium position. The mass is pulled straight down to an extension x and released so that it oscillates about the equilibrium position. The speed of the mass is greatest when the mass is
A. at its maximum upward travel. B. at the equilibrium point. C. at its maximum lower travel. D. somewhere between the equilibrium point and maximum extension.
X-rays travel at a greater speed than radio waves
Indicate whether the statement is true or false
Two cylinders made of the same material roll down a plane inclined at an angle ? with the horizontal. Each travels the same distance. The radius of cylinder B is twice the radius of cylinder A. In what order do they reach the bottom?
a. A reaches the bottom first because it has the greater acceleration. b. A reaches the bottom first because it has a smaller moment of inertia. c. B reaches the bottom first because is experiences a larger torque. d. B reaches the bottom first because it travels a larger distance in one rotation. e. They both reach the bottom at the same time, because each has the same linear acceleration.
What different resistances can be obtained by using two 2. ? resistors and one 4. ? resistor?
What will be an ideal response?