A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal. The projectile lands on a roof that is 4.00 m height. What is the speed when the projectile hits the roof?
A. 19.2 m/s
B. 17.9 m/s
C. 12.5 m/s
D. 9.20 m/s
E. 8.40 m/s
B. 17.9 m/s
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Dimensional Analysis: The speed v of an object falling with a constant acceleration g can be expressed in terms of g and the distance traveled from the point of release, h, as v = agbhc, where a, b, and c, are dimensionless constants. What must be the values of b and c?
Fill in the blank(s) with the appropriate word(s).
An object in the sky brightens suddenly, but shows no hydrogen lines in its spectrum. It is most likely a(n):
A) comet. B) type I supernova. C) type II supernova. D) asteroid impact. E) stellar collision.
The temperature of a quantity of an ideal gas is
A. one measure of its ability to transfer thermal energy to another body. B. proportional to the average molecular kinetic energy of the molecules. C. proportional to the internal energy of the gas. D. correctly described by all the statements above. E. correctly described only by (a) and (b) above.
Water is good for putting out fires because it has a very high latent heat of vaporization
a. True b. False Indicate whether the statement is true or false