1) While a lawnmower moves forward 2 meters, a man pulls on the handle of thelawnmower with a force of 100 Newtons. The angle between thedisplacement of the lawn mower and the direction of the appliedforce is 135.6 degrees. How much work was done on the lawnmower bythe man?

A) 200 Joules
B) - 200 Joules
C) zero
D) - 141 Joules
E) 141 Joules

2) If thelawn-mower had 300 Joules of kinetic energy before the man pulledon it, about how much kinetic energy does it have after the workdone by the man? (Assume there are no energy losses tofriction).

A) 440 Joules
B) 500 Joules
C) 300 Joules
D) negative kinetic energy
E) 160 Joules

3) A car changesits speed from 30 mph to 90 mph. How many times greater is itsfinal kinetic energy compared to its initial kineticenergy?

A) eight times as much
B) four times as much
C) twice as much
D) three times as much
E) nine times as much

4) Assume thatthe car changes chemical potential energy (gasoline) into kineticenergy with the same efficiency at all speeds. How many times moregas will it take far the car to go from 30 to 90 mph, compared togoing from zero to 30 mph?

A) twice as much
B) nine times as much
C) three times as much
D) six times as much
E) the same amount
F) eight times as much

5) The scalarproduct of two vectors is equal to ...(choose all correctresponses).

A) the magnitude of the first vector times the magnitude of thesecond vector times the cosine of the angle between thevectors
B) the magnitude of one of the vectors multiplied by the componentof the other vector that is parallel to the first vector
C) a vector quantity
D) the product of a scalar and a vector
E) none of the other answers is correct