Which of these questions is a scientific question about skateboarding?
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a. how fast does a skateboard move at the bottom of a ramp?
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b. should skateboarding be allowed in shopping malls?
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c. what is the best trick to do while moving backward?
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d. which color of wheel looks best?

Solar cell a produces 100 joules of energy, when a light source is shown on it for 3 minutes. solar cell b produces 200 joules of energy when the same light source is shown on it for 5 minutes. which solar cell works better? a) solar cell b, because it produces more energy. b) solar cell b, because it generates more power. c) solar cell a, because it produces energy quicker. d) solar cell a, because it generates a greater wattage. eliminate

What is the final velocity of the initial velocity of 25 and -50?

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.