If the velocity of an object is negative,
a. its speed is decreasing.
b. its velocity does not exist.
c. it is reversing direction.
d. it is moving in the direction labeled negative.
d
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Consider the curve f(x) = A cos(2?x/?). The wavelength of the wave will be:
a.
the distance 0 to A.
b.
twice the distance 0 to A.
c.
the distance x2 to x3.
d.
twice the distance x2 to x3.
A child is riding a merry-go-round, which has an instantaneous angular speed of 1.25 rad/s and an angular acceleration of 0.745 rad/s2. The child is standing 4.65 m from the center of the merry-go-round
What angle does the acceleration of the child make with the tangential direction? A) 90.0° B) 25.5° C) 32.5° D) 64.5° E) 45.0°
A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s2 . What is the magnitude of the force of the elevator floor on the person?
a. 0.11 kN b. 0.81 kN c. 0.70 kN d. 0.59 kN e. 0.64 kN
A 3.0-kg block slides on a frictionless 20° inclined plane. A force of 16 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
a. 2.0 m/s2 down the incline b. 5.3 m/s2 up the incline c. 2.0 m/s2 up the incline d. 3.9 m/s2 down the incline e. 3.9 m/s2 up the incline