Electromagnetic waves of all wavelengths are collectively known as ________.
A. the electromagnetic spectrum
B. the visible spectrum
C. blackbody radiation
D. white light
E. a continuous spectrum
Answer: A
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The four fundamental forces in nature are ______________, _____________, ____________________, and _____________________
Fill in the blank(s) with correct word
Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. When they hit the ground
A) both of them will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have times the kinetic energy of the lighter one.
As a 2.0-kg object moves from 
m to 
m, the constant resultant force acting on it is equal to 
align="middle" /> N. If the speed of the object at the initial position is 4.0 m/s, what is its kinetic energy at its final position? A. 62 J B. 53 J C. 73 J D. 86 J E. 24 J
For identical cannons and identical projectiles and identical initial speeds, but different pointing angles, the maximum distance for its projectile is attained for the cannon which launches at
A. either 32° or 58° above horizontal. B. zero degrees-a flat trajectory. C. 45° above horizontal. D. 32° above horizontal.