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. 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.
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)
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…
References
Nave, C. (2010a). Momentum. Retrieved 2 August, 2010, from http://hyperphysics.phy-astr.gsu.edu/hbase/mom.html#mom
Nave, C. (2010b). Work, energy, and power. Retrieved 2 August 2010 from http://hyperphysics.phy-astr.gsu.edu/hbase/work.html#wep
Zobel E. (2010a). The Physics Department: Mechanics and Energy. retrieved 12 Nov 2010, from http://zonalandeducation.com/mstm/physics/mechanics/energy/energy.html
Zobel E. (2010b). The Physics Department: Mechanics and Momentum. retrieved 12 Nov 2010 from http://zonalandeducation.com/mstm/physics/mechanics/momentum/momentum.html
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