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
E
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Which is not a type of gravitationally bound stellar binary?
A: visual binary B: eclipsing binary C: spectroscopic binary D: apparent binary E: astrometric binary
Compared with the sum of isolated-nucleon masses, their collective mass in a composite nucleus is
A) more. B) less. C) the same.
Two skaters, both of mass 75.0 kg, are on skates on a frictionless ice pond. One skater throws a 0.40-kg ball at 6.0 m/s to his friend, who catches it and throws it back at 6.0 m/s. When the first skater has caught the returned ball, what is the velocity of each of the two skaters?
a. 0.031 m/s, moving apart b. 0.063 m/s, moving apart c. 0.031 m/s, moving towards each other d. 0.063 m/s, moving towards each other e. 12 m/s, moving apart
The fact that many radio lobes emit more intensely from the side away from the galaxy suggests that
a. they are formed by material falling into the galaxy. b. they are powered by magnetic fields. c. they are excited by radiation from nearby galaxies. d. they are powered by the rapid rotation of the galaxy. e. they are created by jets from the galaxy emitting where the material is halted.