What two things must occur in order to perform work on an object?

Blood has a density of 1.06 She donates 473.176 mL how much mass does she donate

A constant 20 N force is applied to a 7 kg box to push it along the ground. How much work is done by this force if the box moves 2 m?

What occurs when a swimmer pushes through the water to swim? A) The swimmer pushes the water forward. B) The water exerts a reaction force on the swimmer. c) The swimmer exerts a reaction force on the water.

A 0.50 kg puck is sliding on a horizontal shuffleboard court is slowed to rest by a frictional force of 1.2 Newtons. What is the coefficient of kinetic friction between the puck and the surface of the shuffleboard court?

A cylinder with a moving piston expands from an initial volume of 0.150 L against an external pressure of 1.50 atm. The expansion does 217 J of work on the surroundings. What is the final volume of the cylinder

A merry-go-round rotates with a centripetal acceleration of 15 m/s2. If the outer horses are 7 m from the center of the ride, what is their velocity? O A. 11.8 m/s O B. 10.2 m/s O O C. 9.6 m/s D. 8.4 m/s

Which is not a part of the walking mechanism of the human body? a rigid bar a fulcrum a resistance a gear

Based on the periodic table above, which of the following elements is a metal?

Car crosses the first third of the road with unknown speed and the rest of the road with the speed of 50 km/h. What is the the speed in the first third if the average speed of a car is 30km/h?

1. A car speeds up from 10.0 m/s to 45.0 m/s in 4.0 s. What is its acceleration? In your response, show your work, the given and unknown quantities, the equation, and any necessary algebra.