A hammer hits a nail. The force of the nail on the hammer is
A. greater than the force of the hammer on the nail
B. less than the force of the hammer on the nail
C. equal to the force of the hammer on the nail
D. zero
Answer: C. equal to the force of the hammer on the nail
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Applications to Astronomy: What is the parallax angle for Proxima Centauri, which is Earth's nearest star at 4.3 ly? The earth's orbit has a mean radius of 1.5 × 108 km, and 1 ly = 9.46 × 1015 m.
A. 1.2 × 10-14 degrees B. 2.1 × 10-4 degrees C. 1.2 × 10-7 degrees D. 2.1 × 10-7 degrees
Angular Momentum: A uniform ball with diameter of 10 cm rolls without slipping on a horizontal tabletop. The moment of inertia of the ball about an axis through its center is 2.2 × 10-3 kg ? m2, and the translational speed of its center is 0.45 m/s.(a) What is its angular speed of the ball about its center of mass?(b) What is the rotational kinetic energy of the ball?(c) What is the ball's angular momentum about its center of mass?
What will be an ideal response?
Which two methods can be combined to determine an extrasolar planet's density?
A) Doppler and astrometric observations B) Doppler and transit observations C) Doppler and gravitational lensing observations D) astrometric and gravitational lensing observations
Since natural gas creates carbon dioxide, why would it reduce global warming to switch from coal to natural gas?
A) Actually, such a change would not reduce global warming. B) Because electricity from natural gas plants would cost more and thus it would be used less. C) Because mining is not needed in order to obtain natural gas. D) Because natural gas uses less carbon per joule of energy than does coal. E) Because natural gas plants produce a less polluting type of carbon dioxide.