Recycling costs energy as well as time
What will be an ideal response?
True. There are trips for the purpose of recycling, there is the energy cost of
remelting the metals or glass, etc. Overall, however, recycling saves energy.
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A 1200 kg car is traveling at 3.00 m/s and strikes a wall. The 1200 kg car bounces off the wall with a velocity of 4.00 m/s. If the contact with the wall by the car lasts for 0.10 seconds, then the average force on the car is
A. 46,000 N. B. 55,000 N. C. 63,000 N. D. 75,000 N. E. 84,000 N.
Charge of a uniform density (8.0 nC/m2) is distributed over the entire xy plane. A charge of uniform density (5.0 nC/m2) is distributed over the parallel plane defined by z = 2.0 m. Determine the magnitude of the electric field for any point with z = 1.0 m
a. 0.45 kN/C b. 0.17 kN/C c. 0.28 kN/C d. 0.73 kN/C e. 0.62 kN/C
Clouds, snow, and ice have higher albedos than rocks
Indicate whether the statement is true or false
Consider a rock interacting gravitationally with the earth, and choose the interaction’s potential energy to be zero if the rock is at the ground level. A person standing at the bottom of a well throws the rock vertically upward from 20 m below ground level. The rock makes it all the way up to 1 m below ground level before falling back into the well. The total energy of the rock–earth system is
A. negative. B. zero. C. positive (in this particular case). D. positive (because energy is always positive). E. The answer depends on information not specified.