(kinematics) need asap. give me a step by step explanation
1. an automobile moves at a constant velocity of 15.0 m/s east for 4.50 minutes. how far does the automobile travel?
2. a dog runs at an average velocity of 1.40 m/s south for 89.0 sec, and then walks at an average velocity of 0.45 m/s in the same direction for
98.0 sec. what is the average
velocity of the dog during its total time of travel?
3. bus a travels at a constant velocity of 2.00 m/s east and bus b travels in the same
direction at a constant velocity of 3.00 m/s. if bus b starts 1.00 minute after bus a, how long (time) will it take bus b to catch bus a.

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 ..

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?

Observations show that interstellar clouds can have almost any shape and