Two objects are in all respects identical except for the fact that one was coated with a substance that is an excellent reflector of light while the other was coated with a substance that is a perfect absorber of light
You place both objects at the same distance from a powerful light source so they both receive the same amount of energy U from the light. The linear momentum these objects will receive is such that: A)
The reflecting objects receives a larger amount of momentum.
B)
Both objects receive the same amount of momentum.
C)
The reflecting object receives a smaller amount of momentum.
D)
None of the previous answers is correct.
A
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Polaris has always been the star nearest the north celestial pole
Indicate whether the statement is true or false
The celestial equator is
a. a great circle. b. coplanar with the terrestrial equator. c. perpendicular to lines of right ascension. d. all of the above.
If a tree's range can migrate 30 km in a century, and warming is expected to cause isotherms to move north- and southward 300 km in a century, what can be expected to occur? Explain. Would Scotch pine (200 km per century) be similarly affected?
What will be an ideal response?
The coefficient of friction between a block and the plane is 0.25 (see figure). The minimum horizontal force F (in newtons) required to cause the block to slide up the plane is:
(A) 827
(B) 714
(C) 609
(D) 522
