Arefrigerator with a weight of 1,127 newtons needs to be moved into a house using a ramp. the length of the ramp is 2.1 meters, and its height is 0.85 meters. what is the percentage efficiency if a force of 496 newtons is applied to the refrigerator?

a. 44 percent
b. 58 percent
c. 64 percent
d. 76 percent
e. 92 percent

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

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.