Travis sets up and experiment to determine and predict the velocity of a marble at the end of a track. He uses an electronic balance to weigh the marble and a set of calipers to measure the width of the marble. He then places the marble at the top of the track and releases it. Travis then uses the time it takes the marble to pass through a photogate at the bottom of the track to calculate the velocity of the marble. Travis notes that his prediction is significantly lower than his calculated velocity. Which error explains this difference?
A) He forgot to account for friction.
B) He forgot to zero the balance and found a weight for the marble that was too low.
C) He weighed the marble in a weighing dish and failed to account for the mass of the weighing dish.
D) He didn't position the photogate correctly and got the time required for the top of the marble to pass through, rather than to the middle.

Dinate system, and a charge q = - 2.00 nc is placed s2 10 n> c. (a) what is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to es from parallel to perpendicular? (b) at what absolute temperature t is the average translational kinetic energy 32 kt of a molecule equal to the change in potential energy calculated in part(: abovethistemperature,thermalagitationprevents the dipoles from aligning with the electric field.) placed in a uniform electric field e with magnitude 1.6 * 6 on the positive x-axis at x = 4.00 cm. (a) if a third charge q3 = +6.00 nc is now placed at the point x = 4.00 cm, y = 3.00 cm, find the x- and y-components of the total force exerted on this charge by the other two. (b) find the magnitude and direction of figure p21.62 ll uu 21.55 . torque on a dipole. an electric dipole with dipole moment ps is in a uniform external electric field es. (a) find the orientations of the dipole for which the torque on the dipole is zero. (b) which of the orientations in part (a) is stable, and which is unstable? (hint: consider a small rotation away from the equi- librium position and see what happens.) (c) show that for the stable orientation in part (b), the dipole’s own electric field tends to oppose the external field. 21.62 ..

Astone is thrown into a pond. what happens to the amplitude of the resulting waves as they get farther from the point where the stone hit the water? explain.

The slope of a velocity time graph over any interval of time gives the during that interval