Blocks a (5kg) and b (3kg) are released from rest on a 53 inclined surface and start sliding down the incline. before they released, the distance between the blocks is d. coefficient of kinetic friction between the block a and surface is 0.3. coefficient of kinetic friction between the block b and surface is 0.1. after 3s they are released, blocks collide and stuck together. 7.5p a) what is the initial distance, d, between the blocks? 7.5p b) what is the common velocity of the blocks after collision? 5p. c) how much mechanical energy is lost after collision? sin(53o)-0,8; cos(53°)-0.6 solution:

True or false graphs must include scales that increase by the same amount

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.

Which planets are visible without a telescope