According to the law of reflection, the angle of reflection is equal to ______________
Fill in the blank(s) with correct word
the angle of incidence
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Sunspots are hotter than the photosphere
Indicate whether the statement is true or false
Equilibrium: A uniform 40-N board supports two children weighing 500 N and 350 N. If the support is at the center of the board and the 500-N child is 1.5 m from its center, how far is the 350-N child from the center?
A. 1.1 m B. 1.5 m C. 2.1 m D. 2.7 m
In a model airplane, the propeller is a significant part of the total mass. A model airplane is flying on a level path, with its propeller rotating clockwise as seen facing the airplane
At a preset time, a signal causes the plane to lower its tail flaps and it goes into a nose-down attitude. When this happens, the nose of the plane also swings towards the right. Explain why this happens.
Simple Pendulum: A simple pendulum has a period T on Earth. If it were used on Planet X, where the acceleration due to gravity is 3 times what it is on Earth, what would its period be?
A. 3T
B. 
T
C. T
D. T/
E. T/3