When subsurface ground material is completely saturated with water, we call it
A) the water table.
B) groundwater.
C) the saturated zone.
D) the unsaturated zone.
Answer: B
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Two bodies of equal mass m collide and stick together. The quantities that always have equal magnitude for both masses during the collision are
a. their changes in momentum. b. the force each exerts on the other. c. their changes in kinetic energy. d. all of the above. e. only (a) and (b) above.
Two kilograms of molten copper at 1083ºC are dropped into water at 40ºC. Determine the freezing time for complete solidification of the copper. Assume lumped heat capacity and that the heat of fusion of copper is 204.7 kJ/kg and the convective heat transfer coefficient have is 120 W/m2?K. Hint: Use Equation 10-66 for freezing instead of melting.
Rotational Kinetic Energy: An Atwood machine consists of a mass of 3.5 kg connected by a light string to a mass of 6.0 kg over a frictionless pulley with a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. If the system is released from rest, what is the speed of the masses after they have moved through 1.25 m if the string does not slip on the pulley?
A. 2.0 m/s B. 2.3 m/s C. 4.0 m/s D. 5.0 m/s E. 6.0 m/s
As two objects moving toward each other due to gravity get closer, the acceleration of each
A) decreases. B) remains constant. C) increases.