A car is making a 12-mile trip. It travels the first 6.0 miles at 30 miles per hour and the last 6.0 miles at 60 miles per hour. What is the car's average speed for the entire trip?
A) 20 mph
B) 35 mph
C) 40 mph
D) 45 mph
E) 50 mph
C
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Kepler originally proposed that the planets were spaced apart by ____
a. five spheres b. five regular solids c. six tetrahedrons d. five epicycles e. six regular solids
Mass and Weight: An object has a mass of 60 kg on Earth. What are the mass and weight of this object on the surface of the Moon where the acceleration due to gravity is only 1/6 of what it is on Earth?
What will be an ideal response?
Slanting Surfaces Without Friction: A 7.5-kg stone moves up frictionless hill that slopes upward at 41° above the horizontal. If the stone has an initial velocity of 8.5 m/s at the bottom, how far (as measured along the surface of the hill) will it go before stopping?
Fill in the blank(s) with the appropriate word(s).
Consider a sample of water at 6°C. If the temperature is slightly increased, the volume of water
1) increases. 2) decreases. 3) remains unchanged. Suppose the water is cooled instead to 3°C. Then further cooling of it will cause its volume to 4) increase. 5) decrease. 6) remain unchanged.