A Space Walk An astronaut is taking a space walk near the shuttle when her safety tether breaks. What should the astronaut do to get back to the shuttle? View Available Hint(s) Attempt to "swim" toward the shuttle Take slow steps toward the shuttle Take a toal from her tool belt and throw it away from the shuttle. Take the portion of the safety tether still attached to her belt and throw it toward the shuttle Previous Answers Completed Part B Assuming that the astronaut can throw a tool of any inertia with the same acceleration, what tool should be thrown to get back to the shuttle as quickly as possible? View Available Hint(s) Hint 1. How to approach the problem Recall that during an isolated interaction between two objects, the changes in momentum for the two objects are equal and magnitude and opposite in direction. Furthermore, since the time interval in which they interact is the same, the time rates of change in momentum are also equal in magnitude and opposite in direction, which can be expressed as follows (written in terms of x components): 1a-22 Therefore, how will changing the inertia of the tool affect the astronaut's acceleration (such that it is larger)? The tool with the smallest inertia The tool with the largest inertia. Any tool, since the inertia of the tool would make no difference

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 ..

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?