A 2.0-kg object (the system) is lifted vertically through 3.00 m by a constant 150-N force. How much work did Earth do on the object during this process?
What will be an ideal response?
-59 J
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Coastal lands bordering the oceans generally have
A) colder temperatures than lands away from the ocean. B) more moderate temperature variations than inland areas. C) more scenery than land in the continental interior. D) tropical temperatures due to the high heat capacity of water.
Why is the temperature at the region of a sunspot cooler than the photosphere?
a. They are holes in the photosphere that reveal the lower temperature gases in the deeper layers. b. They represent points where streams of cool gas from the corona lower the temperature in those regions of the photosphere c. Powerful magnetic fields in the sunspots act upon the atoms of the photosphere to prevent them from emitting light. d. Powerful magnetic fields inhibit the convective flow of the gases of the photosphere downward allowing them to cool for longer than would normally be permitted.
An object of mass 5.0 kg revolves at 600 rpm in a horizontal circle of radius 1.5 m. Determine the
a) period of the object's motion in seconds, b) object's speed, c) magnitude of the centripetal acceleration, d) magnitude of the centripetal force acting on the object.
A car is traveling along a highway at 65 mph. Which point in the tires is moving forward at 65 mph?
What will be an ideal response?