A40 kg girl gets on her 10 kg wagon on level ground. she has two 5 kg bricks with her. she throws the bricks horizontally off the back of the wagon one at a time with a speed of 7 m/s relative to herself. (a) how fast is she moving after throwing the second brick? (b) how fast would she be going if she had thrown both bricks at the same time at a speed of 7 m/s relative to herself?

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

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.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?