Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
a. each body exerts an equal and opposite force on the other during the collision.
b. the forces act during equal time intervals.
c. the law of conservation of momentum for an isolated system is a vector equation.
d. of all of the above. e. of only (a) and (b) above.
D
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An ice-storage facility uses sawdust as an insulator. If the outside walls are 2 feet thick sawdust and the sideboard thermal conductivity is neglected, determine the R-Value of the walls. Then, if the inside temperature is 25ºF and the outside is 85ºF, estimate the heat gain of the storage facility per square foot of outside wall.
What will be an ideal response?
In the Northern Hemisphere, winter shadows are longer because ________.
A. the Sun moves through the sky closer to the horizon B. the Sun is in the sky for a longer period of time C. the Sun is in the sky for a shorter period of time D. the Sun moves through the sky farther from the horizon E. None of these choices is correct.
The variations in the angle at which the Sun's rays strike Earth's surface give us the seasons. Name four physical factors that contribute to the Earth's seasons. (Hint: Think of the big picture.)
What will be an ideal response?