A vertical 30-cm steel rod, 1.0 cm in diameter, supports a 300-kg mass. What is the change in length of the rod caused by this mass? Young's modulus for steel is 2.0 × 1011 N/m2
A) 6.5 × 10-4 m B) 5.6 × 10-6 m C) 6.5 × 10-6 m D) 6.5 × 10-5 m E) 5.6 × 10-5 m
E
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Choose the correct word(s) that make the statement true. The stars appear to rise and set from east to west, but really the sky is not moving and Earth is rotating from (north, south, east, west) to (north, south, east, west)
What will be an ideal response?
If the last peak in sunspot numbers occurred in 2013, then the next solar max is ________
Fill in the blank(s) with correct word
A pair of parallel conducting plates have potentials of -17 V and 55 V, respectively. An electron is ejected from the plate at potential -17 V and travels to the plate at 55 V. What is the change in the electron’s potential energy as it makes this journey?
a. 
b. 
c. 
d. 
The vast majority of stars in a newly formed star cluster are
A) very high-mass, type O and B stars. B) red giants. C) about the same mass as our Sun. D) less massive than the Sun.