1- suppose your friend is sitting on a sled and asks you to move her across a flat, horizontal field. you have a choice of (a) pushing her form behind by applying a force downward on her shoulders at 30° below the horizontal, or (b) attaching a rope to the front of the sled and pulling with a force at 30° above the horizontal . which option would be easier? why?
2- a crate is sitting in the center of a flatbed truck. as the truck accelerates to the east, the crate moves with it, not sliding on the bed of the truck. what force is accelerating the crate? in what direction is this force?
3- which one you prefer; winning 2.0 newton of gold on earth or 1.0 newton of gold on the moon?

What are two different ways you could find the value of a? explain these methods.

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.

Frequency of electromagnetic waves that a radio station is assigned is called