A magnetic field will be produced at a point in space if an electric field at that point
a. exists
b. gets stronger
c. gets weaker
d. changes direction
e. all of the above
B, C, D
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Which of the following worlds show evidence of dried up rivers and lake beds?
A) the Moon B) Mercury C) Venus D) Mars E) all of the above
Which is the largest distance?
A) The distance from the Sun to the center of the Galaxy. B) The radius of an elliptical galaxy. C) The thickness of the disk of the Andromeda galaxy. D) The thickness of the disk of the Milky Way. E) The distance from Earth to the Virgo cluster of galaxies.
A horizontal uniform 1.20-N meter stick is held up by two vertical strings, one at the 20-cm mark and the other at the 60-cm mark. What is the tension in the string at the 60-cm mark?
A. 0.30 N B. 0.45 N C. 0.60 N D. 0.90 N E. 1.0 N
A person running in place on an exercise machine for 10 minutes uses up 17 Calories. Another person exercises by repeatedly lifting two 2.5-kg weights a distance of 50 cm
How many repetitions of this exercise are equivalent to 10 minutes of running? A) 730 B) 1450 C) 1500 D) 2200 E) 2900