Which of the following statements is not true?
a. Displacement has a direction and a magnitude.
b. Acceleration has a magnitude only.
c. Speed has a magnitude only.
d. Velocity has a magnitude and a direction.
b
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As seen in 1987, when two silicon 28 nuclei fuse, or when seven alpha particles are added to a Si-28 nucleus, the initial result in either case is:
A) the shedding of bipolar planetary nebula shells. B) a nova explosion. C) iron 56. D) cobalt 56. E) nickel 56.
A star of five solar masses would reach the main sequence much ________ than our Sun
Fill in the blank(s) with correct word
At the highest point on the path of a projectile, its vertical acceleration
a. equals g pointing downwards. b. equals g pointing upwards. c. is zero. d. is undetermined. e. does not exist.
Which of the following would not increase the radius of the dark fringes caused by the Newton's Rings effect?
1.increase the radius of curvature of the lens and decrease its index of refraction 2.increase the wavelength of the light and the radius of curvature of the lens 3.use a lens with a larger index of refraction and smaller radius of curvature 4.use a lens with a smaller index of refraction and increase the wavelength of the light