The position of an object is given by where and x and t are in SI units. What is the instantaneous acceleration of the object when
A) -13 m/s2
B) 2.9 m/s2
C) 4.6 m/s2
D) 13 m/s2
Answer: D
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A ventilation fan with a moment of inertia of 0.034 kg·m2 has a net torque of 0.14 N·m applied to it. What angular acceleration does it experience? Select one:
a. 4.1 rad/s2 b. 5.3 rad/s2 c. 3.2 rad/s2 d. 0.31 rad/s2
A likely ratio of the masses of oxygen in two different compounds of tin and oxygen, both of which contain the same mass of tin, is
a. 1.42 to 1. b. 3.11 to 1. c. 3.77 to 1. d. 2 to 1.
When considering the conduction of electricity, the term cathode refers to
a) a positive wire. b) a neutral aqueous solution. c) a melted ionic compound. d) a negative wire.
To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water? Neglect air resistance
A) 3.6 s B) 2.3 s C) 2.6 s D) 2.9 s E) 3.2 s