An object is being acted upon by three forces and as a result moves with a constant velocity. One force is 60.0 N along the +x-axis, and the second is 75.0 N along the +y-axis. What is the magnitude of the third force?
A) 135 N
B) 15.0 N
C) 48.0 N
D) 67.5 N
E) 96.0 N
E
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Leavitt's law is a relationship between
A) a Cepheid variable star's period and luminosity. B) a galaxy's distance and recession speed. C) a galaxy's distance and redshift. D) a main-sequence star's color and luminosity.
Avogadro's number is related to the universal gas constant R and the number of moles n by:
a. NA = Rn b. NA = R/n c. NA = n/R d. Avogadro's number cannot be related to these two quantities alone.
Impulse: During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns?
A. to exert a larger force on the shells B. to reduce frictional losses C. to allow the force of the expanding gases from the gunpowder to act for a longer time D. to increase the force exerted on the bullet due to the expanding gases from the gunpowder E. to reduce the force exerted on the bullet due to the expanding gases from the gunpowder
Saturn’s average density is less than water’s. Suppose Saturn were placed on a much larger planet made entirely of water. What would happen?
a. It would float. b. It would sink to the center of the water planet. c. It would be spread out due to the rotation of the water planet. d. It would merge into the water planet; denser materials sinking toward the core and lighter materials forming part of the atmosphere. e. There would be a devastating impact and Saturn would be torn apart to form a giant ring system around the water planet.