A particular chemical reaction occurs at room temperature (293 K) at half the rate that it does at 300 K. What is the activation energy for this reaction?
a. 
b. 
c. 
d. 
a.
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An airplane flying with a constant speed flies from a warm air mass into a cold air mass. The Mach number (the ratio of the speed of the airplane to the speed of sound) will:
a. increase. c. stay the same. b. decrease. d. become unstable.
A planet has two small satellites in circular orbits around the planet. The first satellite has a period 12.0 hours and an orbital radius 6.00 × 107 m. The second planet has a period 16.0 hours. What is the orbital radius of the second satellite?
A) 4.50 × 107 B) 3.90 × 107 C) 9.24 × 107 D) 8.00 × 107 E) 7.27 × 107
Pascal's Principle: The small piston of a hydraulic lift has a diameter of 8.0 cm, and its large piston has a diameter of 40 cm. The lift raises a load of 15,000 N. Assume the pistons each have negligible weight.(a) Determine the force that must be applied to the small piston.(b) Determine the pressure applied to the fluid in the lift.
What will be an ideal response?
A person spearfishing from a boat sees a fish located 3 m from the boat at an apparent depth of 1 m. To spear the fish, the person should aim
1.at the image of the fish. 2.above the image of the fish. 3.below the image of the fish.