The side of a cube is decreased by 6%. The percentage decrease of the volume of the cube is
A. 6%.
B. 9%.
C. 12%.
D. 17%.
D. 17%.
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How much of the solar system's total mass is contained in the Sun?
A) about half B) about 90% C) about 95% D) about 99.8% E) exactly 100%
Jupiter lies about 5 A.U. from the Sun, so at its distance:
A) the Sun's gravity is just as strong as it is here at Earth. B) the Sun's gravity must be five times stronger to hold massive Jupiter in orbit. C) the Sun's gravity is five times weaker there than at one A.U. distance. D) the Sun's gravity is 25 times weaker than its pull on the Earth. E) the Sun's gravity is so weak that ultimately Jupiter will escape the solar system.
Air expands adiabatically (no heat in, no heat out) from T = 300 K and P = 100 atm to a final pressure of 1 atm. Treat the gas as ideal with ? = 1.4, and determine the final temperature. Compare your result to the boiling points of nitrogen (77.4 K) and oxygen (90.2 K). Could this method result in the liquification of air?
A crane lifts a steel submarine of density 7800 kg/m3 and mass 20,000 kg
What is the tension force that the lifting cable exerts on the submarine (a) when the submarine is submerged in water of density 1000 kg/m3, and (b) when it is entirely out of the water? A) (a) 2.0 × 105 N (b) 1.7 × 105 N B) (a) 1.7 × 105 N (b) 2.0 × 105 N C) (a) 2.6 × 103 N (b) 2.0 × 105 N D) (a) 2.0 × 105 N (b) 2.6 × 103 N