The principle that total momentum does not change during a brief collision is a result of
A. Newton's first law and Newton's third law.
B. Newton's second law and Newton's third law.
C. Newton's first law and Newton's second law.
D. the definition of the newton.
E. the definition of the kilogram.
Answer: B
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Does the universe look the same in the directions of the HDFN and HDFN (fractions of galaxy types statistically similar)?
A: Yes. B: No.
Sodium's emission lines at 589.0 nm and 589.6 nm pass through a diffraction grating and form two m = +1 maxima on a viewing screen. For which situation would the spacing between the two lines increase?
a. The grating is exchanged for one having fewer lines per millimeter b. The grating is exchanged for one with twice the total number of lines. c. The maxima are viewed in second order. d. The intensity of the light is doubled.
When an object is reflected in a plane mirror, the image is always
A. Virtual B. Real C. Inverted D. None of these
A 1.00-m3 object floats in water with 20.0% of its volume above the waterline. What is the force that Earth exerts on the object? The density of water is 1000 kg/m3
A) 1,960 N B) 7,840 N C) 9,800 N D) 11,800 N