If you lift a 80 N book 50 cm off the floor, how much work did you do? 1. 0

2. 4000 J

3. 40 J

4. 1.6 J

A man pushes a couch a distance of 0.75 m. If 450 J of work is done, what is the magnitude of the force applied?

1. 16.9 J

2. 45

3. 1350 J

4. 2700 J

A6.5-g iron meteor hits the earth at a speed of 295 m/s. if its kinetic energy is entirely converted to heat in the meteor, by how much will its temperature rise? the specific heat of iron is 113 cal/kg ∙ c°, and 1 cal = 4.186 j. a) 57,100 c° b)384 c° c)0.147 c° d)92.0 c°