A ring, seen from above, is pulled on by three forces. The ring is not moving. How big is the force F? A. 20 N B. 10cosθ N C. 10sinθ N D. 20cosθ N E. 20sinθ N

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.

Suppose you hit your hand against the edge of table. using newton’s third law of motion why does my hand hurt? explain

In a particular chemical reaction, the energy of the reactants is 30 kj and the energy of the products is 5 kj. 
 the maximum energy of the system is 40 kj. sketch a potential energy diagram for this reaction. make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.