If 5J of work are done on a spring, compressing it by 12cm, what is the spring constant?

A box is pulled by a force of 200N making an angle of 30° with the horizontal. How much work is done on the box if it is displaced by 20m?

A spider walks on a path that is at 25 ∘. Calculate the power output of a 0.42g spider as it walks up a windowpane at v =2.5 cm/s. Answer in Watts

3) The figure below illustrates a skier who is skiing on a large frictionless spherical ball of snow. The skier can be treated as a point-like object. The skier starts at the top of the ball with very little speed and picks up speed while traveling along the surface of the snow. During this time, the only forces acting on the skier are the gravitational force applied by the Earth and the normal force applied by the snow. At the moment the radial line extending from the skier to the center of the ball defines an angle a with respect to a vertical line, the skier is about to lose contact with the ball. Determine the value of a.

(a) What is the efficiency of an out-of-condition professor who does 2.00 × 105 J of useful work while metabolizing 510 kcal of food energy? (Enter your answer as a percentage. Enter a number.) % (b) How many food calories (in kcal) would a well-conditioned athlete metabolize in doing the same work with an efficiency of 20%? (Enter a number.) kcal

(a) What is the efficiency of an out-of-condition professor who does 2.30 × 105 J of useful work while metabolizing 490 kcal of food energy? (Enter your answer as a percentage. Enter a number.) % (b) How many food calories (in kcal) would a well-conditioned athlete metabolize in doing the same work with an efficiency of 25%? (Enter a number.) kcal

How much work is done by gravity when dead lifting a 100.0 kg barbell 64.11 cm from the floor to hip level [round your final answer to zero decimal places]?

Lee pushes horizontally with a force of 68 Non a 25 kg mass for 30 m across a floor.Calculate the amount of work Lee did.Answer in units of J.

How many joules (J)of work did joe do on the box? How much work (in J) was done by friction on the box.

A roller coaster has 800,000 Joules of kinetic energy and is moving with a speed of 40 m/s. VWhat is the mass of the roller coaster in kg? PLEASE USE COMMAS IN YOUR ANSWERS IF NEEDED! The formula for kinetic energy is: KE = 1/2 mv2 V = velocity = distance/time DON'T FORGET SIG FIGS! « Previous 90°F Partly