A block of mass m is projected across a horizontal surface with an initial speed v. It slides until it stops due to the friction force between the block and the surface. The same block is now projected across the horizontal surface with an initial speed v/2. When the block has come to rest, how does the distance from the projection point compare to that in the first case?
1.It is the same.
2.It is half as large.
3.It is one fourth as large.
4.It is none of these.
3
Physics & Space Science
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Indicate whether the statement is true or false
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The direction of the Moon's revolution around
Earth is a) westward. b) eastward. c) clockwise (looking from above Earth's north pole). d) variable, because the Moon changes its orbital direction as it changes phases.
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The radiation emitted from a star has a maximum intensity at a wavelength of 500 nm. What is the temperature of this star?
a. 6,000 K b. 5,000 K c. 1.5 × 10^9 K d. 500 K e. 10,000 K
Physics & Space Science
Which one of the following is not an area of physics?
a. Mechanics b. Optics c. Algebra d. Acoustics
Physics & Space Science