If two protons are moved 3 times closer together, the electrical force between them is what factor of the original force?
9 times greater
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What are the planets of our Solar System in order from closest to farthest from the Sun?
What will be an ideal response?
A magnifying glass has a convex lens of focal length 15 cm. At what distance from a postage stamp should you hold this lens to get a magnification of +2.0?
How do scientists estimate the age of the Solar System?
A. They measure the heat content of the planets. B. They measure the ratios of radioactive elements in rocks. C. They count the number of craters on the Moon and Mercury. D. They compare the weathering of rocks on Earth with lunar rocks. E. None of these choices are correct.
An amusement ride consists of a car moving in a vertical circle on the end of a rigid boom. The radius of the circle is 10 m. The combined weight of the car and riders is 5.0 kN. At the top of the circle the car has a speed of 5.0 m/s which is not changing at that instant. What is the force of the boom on the car at the top of the circle?
a. 3.7 kN down b. 1.3 kN down c. 6.3 kN up d. 3.7 kN up e. 5.2 kN down