A mass on a spring undergoes SHM. When the mass is at its maximum distance from the equilibrium position, which of the following statements about it are true? (There could be more than one correct choice.)
A) Its elastic potential energy is zero.
B) Its acceleration is zero.
C) Its speed is zero.
D) Its total mechanical energy is zero.
E) Its kinetic energy is a maximum.
C
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A 3.00-m-long ladder, weighing 200 N, leans against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.00 m away from the wall. The ladder is not completely uniform, so its center of gravity is 1.20 m from its base
What force of friction must the floor exert on the base of the ladder to prevent the ladder from sliding down? A) 93.3 N B) 130 N C) 28.3 N D) 102 N E) 150 N
An aquarium contains a 5-cm layer of water (n = 1.333) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the carbon tetrachloride is 20°, what is the angle of refraction into the air?
a. 20° b. 30° c. 38° d. 69° e. 26°
Electrons are negatively charged
a. True b. False Indicate whether the statement is true or false