How much energy would be released if 2.0 kg of material was lost during a reaction? (c = 3.0 × 108 m/s)
A) 4.7 × 10-8 J B) 1.5 × 1016 J C) 6.0 × 108 J D) 1.8 × 1017 J
D
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Based on its surface features, the most important event on Venus in the past billion years or so was
A) a global "repaving" that erased essentially all the surface features that had existed earlier. B) the eruption of a giant volcano that formed one of Venus's "continents." C) the impact of an unusually large asteroid that left a deep scar on one side of the planet. D) the onset of mantle convection, which caused Venus's lithosphere to split into plates like those on Earth.
A 12000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil and capped at both ends with tight-fitting pistons
The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the initial force that must be applied to the smaller piston in order to start lifting the car? For purposes of this problem, neglect the weight of the pistons. A) 727 N B) 926 N C) 2900 N D) 3330 N E) 1.20 kN
An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 500 m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?
a. 0.25 b. 0.50 c. 1.00 d. 2.00 e. 4.00
What is a positron?
a. Another name for a proton. b. Another name for an alpha particle. c. A charged neutrino. d. A negatively charged proton. e. The antiparticle of an electron.