At the same temperature, which has greater average speed in the air?
A) very light molecules
B) heavier molecules
C) both have equal average speeds.
Answer: A
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Answer the following statement(s) true (T) or false (F)
1. The mass of the earth–moon system is somewhat less than the sum of the mass of the earth and the mass of the moon 2. If the activity of a radioactive sample has decreased by a factor of 4 in time T, then T = 2t1/2
________ major contribution to astronomy is his extensive series of measurements of planetary positions.
A. Kepler's B. Copernicus's C. Galileo's D. Tycho Brahe's
An artificial satellite in a low orbit circles the earth every 98.0 minutes. What is its angular speed in rad/s?
What will be an ideal response?
A 0.20-kg block rests on a frictionless, level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. A frictional force of 0.3 N exists between the block and surface. What is the speed of the block when it passes through the equilibrium
point after being released from the 4.0-cm displacement point? a. 0.45 m/s c. 0.72 m/s b. 0.63 m/s d. 1.2 m/s