Two nonparallel vectors determine a plane. Relative to the plane determined by the position vector where the force is applied and the force vector, in which direction is the torque vector about the origin?
A)
perpendicular to the plane
B)
in the plane, but perpendicular to both the position vector and the velocity vector
C)
in the plane, but perpendicular to the velocity vector
D)
in a direction dependent on the magnitudes of the velocity and position vectors
E)
in the plane, but perpendicular to the position vector
A
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A child grips tightly the outer edge of a playground merry-go-round as other kids push on it to give it a dizzying rotational velocity. When the other kids let go, the horizontal component of the net force on the child points most nearly
A. Inward toward the center of the merry-go-round. B. Outward away from the center of the merry-go-round. C. In the direction of rotation. D. Nowhere: the net force’s horizontal component is zero. E. In some other direction (specify).
Motion in a circle at constant speed is motion with constant acceleration
a. True b. False Indicate whether the statement is true or false
A race car moving with a constant speed of 60 m/s completes one lap around a circular track in 50 s. What is the magnitude of the acceleration of the race car?
a. 8.8 m/s2 b. 7.5 m/s2 c. 9.4 m/s2 d. 6.3 m/s2 e. 5.3 m/s2
Which of the following is calculated by dividing the ratio of exposed subjects to nonexposed subjects in the case group by the ratio of exposed subjects to nonexposed subjects in the control group?
What will be an ideal response?