The electron was discovered in 1897 by the English physicist J. J. Thomson
Indicate whether the statement is true or false
TRUE
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What causes stars to twinkle?
A) It is intrinsic to the stars—their brightness varies as they expand and contract. B) variations in the absorption of light at different depths in Earth's atmosphere C) variable absorption by interstellar gas along the line of sight to the star D) bending of light rays by turbulent motions of air in Earth's atmosphere E) the inability of the human eye to focus on small points of light
When we apply the Lorentz factor ? to momentum, we
A) multiply by ? as with the equation for time dilation. B) multiply by the reciprocal of ?. C) find it does not apply.
According to Newtonian physics, an object with no forces acting on it must
A) be accelerated, with an unchanging acceleration. B) either be at rest or have constant velocity. C) eventually come to rest. D) be at rest. E) fall.
A projectile is launched from ground level at an angle of 30.0° above horizontal with a speed of 10.0 m/s. If the projectile is moving over level ground, what is the maximum height above the ground that the projectile reaches?
A) 2.54 m B) 1.27 m C) 5.00 m D) 3.54 m E) 20.0 m