The region from the origin to the elastic limit on an applied force versus elongation graph for a typical metal under tension is referred to as the
A)
elastic region.
B)
proportional region.
C)
plastic region.
D)
ultimate strength region.
E)
breaking region.
A
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Which of the following statements would explain the fact that larger molecules, such as amino acids, do not produce spectral lines in the OBAFGKM classification?
A. Larger molecules break apart at the high temperatures of stellar atmospheres. B. The spectra of larger molecules are too complicated. C. Larger molecules require higher temperatures to show absorption lines. D. The spectra of hydrogen and helium are sufficient to classify stars. E. All of these choices are correct.
William Herschel's original model for our Galaxy was based on counting stars
Indicate whether the statement is true or false
A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point of its swing, when it is moving horizontally, the ball collides with a 0.80-kg block initially at rest on a horizontal frictionless surface. The speed of the block just after the collision is 3.0 m/s. What is the speed of the ball just
after the collision? a. 1.7 m/s b. 1.1 m/s c. 1.5 m/s d. 1.3 m/s e. 2.1 m/s
A freely-falling watermelon falls with constant
A) velocity. B) speed. C) acceleration. D) distances each successive second.