What of the following is a true statement regarding springs? a. in hooke's law, the force exerted by the spring acts in the same direction as displacement. b. springs are designed to provide unpredictable variations in force. c. the force exerted by a spring has a quadratic relationship with the displacement from equilibrium. d. the higher the value of the spring constant, the stiffer the spring. e. the spring constant is represented by the symbol cs

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.