Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The potential energy of the crate is mgd
Indicate whether the statement is true or false
F
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What observation made of other stars seems to suggest the solar nebula hypothesis is correct?
a. Stars are found to exist more often in binaries than by themselves. b. Protostars are seen to radiate much of their light at infrared wavelengths. c. Nearby stars tend to be low mass red dwarfs. d. Young stars are found to have hot disks that surround them.
John throws a baseball from the outfield from shoulder height, at an initial velocity of 39.2 m/s at an initial angle of 30.0° with respect to the horizontal. The ball is in its trajectory for a total interval of 4.00 s before the third baseman catches it at an equal shoulder-height level. (Assume air resistance is negligible.) What is the ball's horizontal displacement?
a. 76.4 m c. 136 m b. 38.2 m d. zero
This H-R diagram shows the life track of a 1 MSun star from the time it first becomes a main-sequence star. Which numbered point represents the star when it has both hydrogen-fusing and helium-fusing shells around an inert carbon core?
A) Point 1 B) Point 2 C) Point 3 D) Point 4
A hypothesis is a very tentative explanation of some ______________ of nature
Fill in the blank(s) with correct word