A block with a mass of 6.2 kg is being pushed along a surface over a period of 15 seconds. The magnitude of the force acting on the object with respect to the distance travelled along the x-direction of the surface is shown below. Determine the total external work performed on the block in the time interval of 6 to 15 seconds.

You are pushing a refrigerator across the floor of your kitchen. You exert a horizontal force of 306 N for 7.5 s, during which time the refrigerator moves a distance of 3.3 m at constant velocity. (A) what is the total work (by all forces) done on the refrigerator? (Answer in J) (b) what is the work done by friction? (Answer in J)

A 3.54 kg object has three forces that act on it as it moves 5.35 m in the negative x-direction, starting from rest. The three forces that act on the object are described in the table below: Force Force 19.91 N Force 2 34.7 N Force 3 49.5 N |magnitude direction |along the positive x-axis |along the negative y-axis |44.5 degrees above the -x-axis a. Determine the work done by each of the forces. i. Work done by Force 1 ii. Work done by Force 2 iii. Work done by Force 3 J J J b. What is the net work acting on the object? J c. Using work and kinetic energy ideas (Unit 7), what is the speed of the object after it has moved 5.35 m? m/s

A small boat is crossing a lake on a windy day. During some interval of time, the boat undergoes the given displacement A7. A7 = (3.17 m) î+ (2.77 m)ĵ During the same interval of time, the wind exerts the given constant force F on the boat. F = (277 N)î (125 N)ĵ What is the total work done on the boat by the wind over this period of time? work: What is the angle between the direction of the wind force and the direction of the boat's motion during this time interval? angle: J

An object moves in the x-y plane while acted on by the force F(x,y) = k1yi + k2xj, where k1 and k2 are constants with units of N/m. The object moves along a straight line path from Cartesian coordinate (x1, y1) to (x2, y2). Write an expression for the work done on the object by this force.

A cable exerts a constant upward tension of magnitude 1.54 ✕ 104 N on a 1.20 ✕ 103 kg elevator as it rises through a vertical distance of 3.10 m. HINT (a) Find the work done by the tension force on the elevator (in J).  J (b) Find the work done by the force of gravity on the elevator (in J).  J