Jane says that the magnitude of the torque exerted by a force of magnitude F is equal to the perpendicular distance from the axis of rotation r? multiplied by F,
while Jason insists that it is equal to the distance from the axis of rotation r multiplied by the magnitude of the perpendicular component of the force, F?. Who is right?
They are both right. Both answers are equivalent to ? = F r sin?, where ? is the angle between the force and the radial line.
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The ""billiard ball model" of the atom is associated with
a. Bohr. b. Thomson. c. Rutherford. d. Dalton.
A hole is punched in a full milk carton, 10 cm below the top. What is the initial velocity of outflow?
a. 1.4 m/s b. 2.0 m/s c. 2.8 m/s d. 3.9 m/s e. 4.2 m/s
Which of the speeds v listed below is the lowest speed where the probability of a gas molecule having that speed is negligible compared to that for v = vp (“negligible” meaning less than 1/100 of its value at v = vp ).
A. v ? 0.2 vp B. v = 2 vp C. v = 3 vp D. v = 5 vp
A track star in the broad jump goes into the jump at 12.0 m/s and launches himself at 26.0° above the horizontal. How long is he in the air before returning to Earth? (g = 9.8 m/s2)
a. 0.5 s b. 1.1 s c. 2.1 s d. 2.2 s e. 1.2 s