Work, Energy, And Momentum Work out the following problems. Be sure to show your work in detail. See the " uploaded file for examples of how the problems should be solved.

A freight elevator has a mass of 3,000 kg, including cargo. The elevator motor raises the load 50 m in 30 s. How much work is done by the motor? What is its power?

W= F*d

F=m*a

W=m*a*d

W= 3000kg *9.8m/s2*50m

W= 1,470,000J

P=W/t

P=1,470,000J/30s

P= 49,000W

What is the KE (in J) of a 2650 lb Honda Civic traveling at 100 mph?

KE=1/2mv2

Conversions from English to metric m=2650lb * 1kg/2.2 lb m=1204.55kg

100 mph * 1 hr/3600 sec * 1609.344 m/mi= 44.7 m/s

KE= 1/2 * 1204.55kg * (44.7m/s2)

If it is thrown vertically with an initial velocity of 50 mph, what is its potential energy change at its highest point? How high does the baseball rise? Neglect air friction.
h=v2/2g

conversion from English to metric

mph *.44704 m/s

1 mph

22.352m/s h= (22.352 m/s) 2/2*9.8m/s2

h=25.49m

PE=Fd; F=ma

PE=m*a* d

PE=145g* 9.8m/s2* 25.49m

PE= 36,221.29J

4. Previously, we calculated the KE of a 2650 lb Honda Civic traveling at 100 mph. What is its momentum?

P=mv

P=2650lb * 1kg/2.2.lb * 100m/h * .44704m/s / 1 mph

P=20.32 kgm/s

5. A 1200 kg Honda Civic traveling at 160 km/hr on the…