You and a friend are pulling on a rope in opposite directions as hard as you can? What is the “equal and opposite force” to the force of your hand pulling on the rope described by Newtons Third Law?
A. The force of your arm pulling back on your hand.
B. The force of the rope pulling your friend’s hand.
C. The force of your friend pulling on the rope in the opposite direction.
D. The force of the rope pulling on your hand in the opposite direction.
E. The force of friction between the ground and your shoes.

Suppose you were asked to find the torque about point p due to the normal force n in terms of given quantities. which method of finding the torque would be the easiest to use?

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?