Constant Angular Acceleration: A wheel accelerates with a constant angular acceleration of 4.5 rad/s2 from an initial angular speed of 1.0 rad/s. (a) Through what angle does the wheel turn in the first 2.0 s, and (b) what is its angular speed at that time?
What will be an ideal response?
(a) 11 rad (b) 10 rad/s
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Significant Figures: How many significant figures are in the number 0.010?
A. four B. three C. two D. one
Winter and summer differ in length on Mars because of its elliptical orbit
Indicate whether the statement is true or false
Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together?
A) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are very close together. B) Fusion can proceed only by the proton-proton chain, and therefore requires that protons come close enough together to be linked up into a chain. C) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. D) Nuclei have to be very hot in order to fuse, and the only way to get them hot is to bring them close together.
Each circle represents an atom. Which of the following boxes contains an element? A compound? A mixture?
A) element: A, C; compound: A, B, C; mixture: A, B B) element: C; compound: A, B; mixture: B C) element: A, C; compound: A, B; mixture: A D) element: A, C; compound: A, B; mixture: A, B