Express an angle of 450° in radians
What will be an ideal response?
7.85 rad
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How is radioactive dating used to determine the age of an object?
a. Both the amounts of radioactive and decay material are measured. Using these with the radioactive material's half-life, the age can be estimated. b. The amount of radioactive material is measured. Using this with the radioactive material's half-life, the age can be estimated. c. The amount of decay material is measured. Using this with the radioactive material's half-life, the age can be estimated. d. The amount of heat generated by radioactive dating is measured to determine age.
When a rocket forces exhaust gases downward, the exhaust gases
A) as the name implies, soon exhaust their influence. B) play no further role in the motion of the rocket. C) exert an upward force on the rocket.
Why does the number of sunspots change over time?
A. The Sun's magnetic field changes in strength and shape with time. B. The brightness of the Sun increases and decreases with time. C. The temperature of the Sun increases and decreases over time. D. The solar wind changes speed with time, obscuring them. E. The number of sunspots does not change-the spots are simply on the other side.
Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A:
A. it has the same position and the same velocity as A. B. it has the same position and the same acceleration as A. C. it has the same velocity and the same acceleration as A. D. it has the same displacement and the same velocity as A. E. it has the same position, displacement and velocity as A.