A block hangs at rest from the ceiling by a piece of rope. Consider the forces acting on the block. A block hangs from the ceiling by a spring. Consider the forces acting on the block when it is as rest.

A ball is shot into the air with a spring-loaded cannon. Consider the forces acting on the ball while it is in the air.
A skydiver ( who hasn’t opened his parachute yet) falls at terminal velocity. Consider the forces acting on the skydiver)

Force Present or Absent?
-Gravity
-Spring
-Tension
-Normal
-Friction
-Air Resistance

Ibelieve the answer is b. dugout

Kiloleter, mega leterhope this !

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)