Wendy walks 10 m in one direction at 2 m/s, then runs 6 m in the same direction at 6 m/s. Next, she stops for 4 seconds, and finally walks in the opposite direction at 4 m/s for 6 seconds
Wendy's average speed is closest to:
1.½ m/s
2.1 m/s
3.1½ m/s
4.2 m/s
5.2½ m/s
6.3 m/s
7.3½ m/s
8.4 m/s
9.the negative of one of the choices above
10.impossible to determine
5
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Many medium-mass stars will expel its outer atomosphere to form a(n) _______________ nebula as they age
Fill in the blank(s) with correct word
Consider the loop of flexible wire shown below. If we pass a current through the loop, will it tend to expand (becoming more circular), scrunch up even more tightly, or do nothing?
A. Expand
B. Scrunch up
C. Do nothing
D. The answer depends on the current’s direction.
If the volume of an object doubles with no change in mass, its density would be
A) half. B) double. C) unchanged.
The ratio of the density of a neutron (r = r0A1/3) to the density of a classical electron (re = ke2/mec2 = 2.8 × 10^?15 m) is
a. 4.3 × 10^2 b. 2.3 × 10^4 c. 1.4 × 10^2 d. 6.9 × 10^?3 e. 4.3 × 10^3