A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J
b. 82 J
c. 85 J
d. 74 J
e. 43 J
c
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Which of the following offers evidence to support the hypothesis that life arises relatively easily under the conditions that existed on the early Earth?
A) Small animals like Tardigrades can survive exposure to the near-vacuum of space. B) Life is currently present in extreme environments like deep ocean volcanic vents. C) Life was present on Earth by about the time that the heavy bombardment ended. D) All organisms on Earth use DNA as their genetic material.
The temperature of a quantity of an ideal gas is
a. one measure of its ability to transfer thermal energy to another body. b. proportional to the average molecular kinetic energy of the molecules. c. proportional to the internal energy of the gas. d. correctly described by all the statements above. e. correctly described only by (a) and (b) above.
From the Sun, the distance to the Galactic Center is about:
A) 8 pc. B) 8,000 pc. C) 100,000 pc. D) 225 million pc. E) 100 billion pc.
A solenoid must be produced that has a magnetic flux density of 25,000 T. The coil for the solenoid has 200 loops in a distance of 1 cm, and the maximum current for the wire is 1A. Select a suitable material for this solenoid from the materials listed. For this design, performance is more important than cost.
What will be an ideal response?