What is the closest stellar system to the Solar System & how far away is it?
A. Sirius, about 8.6 light years away
B. Alpha Centauri, about 4.3 light years away
C. Wolf 359, about 359 AU away
D. Barnard's Star, about 6 AU away
E. Alpha Centauri, about 4.3 AU away
Answer: B. Alpha Centauri, about 4.3 light years away
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The velocity of an airplane with respect to the ground is 
m/s at an angle of 30.0 degrees NORTH of EAST. The velocity of the airplane with respect to the air is 
m/s at an angle of 60.0 degrees NORTH of EAST. What is the velocity of the air with respect to the ground?
A. 112 m/s at 50.0 degrees NORTH of EAST B. 102 m/s at 17 degrees SOUTH of EAST C. 134 m/s at 49 degrees SOUTH of EAST D. 134 m/s at 17 degrees NORTH of EAST E. 102 m/s at 65 degrees NORTH of EAST
Answer the following statement(s) true (T) or false (F)
Which of the following devices are heat engines? 1.Your body 2. An automobile engine 3.A tornado 4. The sun 5. A rocket
A Hooke's law spring is mounted horizontally over a frictionless surface. The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface. What compression of the spring would result in the mass attaining 4 times the speed received in the situation described here?
a. 2.00d b. 0.50d c. 4.00d d. 16.00d
Radon has a 4-day half-life. Starting with 10 radon atoms, how many will remain after 4 days?
A) Precisely five. B) Either four, or five, or six. C) Precisely zero. D) About 5, but this prediction is uncertain due to the inaccuracies of our measuring devices. E) About 5, but this prediction is uncertain due to quantum uncertainties.