Muscles in animals are often found in pairs, because

A. muscles can only produce a force as they relax.

B. muscles can only pull.

C. muscles need to be able to both push and pull.

D. muscles can only push.

How much work does this force do as the particle moves along the x-axis from x = 0 to x = l? express your answer in terms of the variables f0 and l?

The bond enthalpy value for a carbon to hydrogen bond is 413 kJ. What does this mean? A. It takes 413 kJ of energy to break a carbon to hydrogen bond. B. The formation of a carbon to hydrogen bond releases 413 kJ of energy. C. Both of the above

A baseball is thrown with a horizontal velocity of 40.20 m/s and no vertical velocity. If the ball leaves the pitcher's hand at a height of 2.

How much tension must a rope withstand if used to accelerate a 960-kg car from rest horizontally along a frictionless surface to 1.20 m/s in 5 seconds?

Physics Apex: Debra and Julie push on a table in the same direction. Debra pushes forward with a force of 200 N, and Julia pushes forward with a force of 150 N. What is the net force on the table.

What happens to the total mechnical energy of the apple as it falls from the tree?

Fair Bonus Question: Derive the equation for gravitational potential energy, starting with the definition of work.

A juggler throws a bowling pin into the air with an initial velocity. Another juggler drops a pin at the same instant.

The liquid electrolyte in the battery typically takes what kind of net charge? a. positive b. negative c. neutral

Relating to Newton's Third Law, action and reaction, what is the reaction when a rocket expels gas, smoke and flames from the nozzle end of the rocket engine?