The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The distance from the starting point is __________
Fill in the blank(s) with correct word
8 m
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Why does the Big Bang theory predict that the cosmic microwave background should have an essentially perfect thermal radiation spectrum?
A) This radiation came from the heat of the universe itself. B) The spectrum of pure hydrogen is a perfect thermal radiation spectrum. C) The spectrum of 75 percent hydrogen and 25 percent helium is a perfect thermal radiation spectrum. D) The light from all the stars and gas in the sky averaged over the entire universe is a perfect thermal radiation spectrum. E) The first stars that formed in the universe must all have had the same temperature.
As shown below, a garden room has three walls, a floor, and a roof, but is open to the garden on one side. The wall widths are L and w. The roof height is h. When traveling sound waves enter the room, standing sound waves can be present in the room if the wavelength of the standing waves is
?
?
A.
, where n is a positive integer.B.
, where n is an odd integer.C.
, where n is an even integer.D.
E.
The magnetic field at point P due to a 2.0-A current flowing in a long, straight, thin wire is 8.0 ?T. How far is point P from the wire? (?0 = 4? × 10-7 T ? m/A)
A) 10 cm B) 2.0 cm C) 5.0 cm D) 2.5 cm E) 4.0 cm
Answer the following statement(s) true (T) or false (F)
1. Imagine that in a rectangular region of empty space between the magnetic poles of a large horseshoe magnet, the magnetic field is essentially uniform and points directly downward, but is zero outside the region’s boundary. The four vertical sides of the rectangular region are in empty space. We can easily imagine such a field, but such a field is in fact physically impossible.