Hydrostatic equilibrium refers to the balance between weight and pressure
a. True
b. False
Indicate whether the statement is true or false
True
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Let's say that a gas decreases in temperature, but that its volume remains constant during this process. What happens to its internal energy in this case?
1.The internal energy decreases. 2.The internal energy increases. 3.The internal energy remains constant. 4.It cannot be determined whether it will increase, decrease, or remain the same.
The work done in moving a positive charge against an electric field does not depend on the path chosen in moving the charge in that field. Based on the statement, what kind of force field is the electrostatic field?
A) discrete B) quantized C) polarized D) conservative E) nonconservative
Through what potential difference must an electron (starting from rest) be accelerated if it is to reach a speed of 3.0 × 107 m/s?
A. 5.8 kV B. 2.6 kV C. 7.1 kV D. 8.6 kV E. 5.1 kV
A concrete wall of a cold storage room measures 3.0 m high, 5.0 m wide, and 20 cm thick. The inside wall is to be covered by a layer of wood in order to reduce the rate of heat flow through the wall by 90 percent
The inner surface of the wooden wall is maintained at -10°C and the outer surface of the concrete wall is at 20°C. The thermal conductivities of concrete and wood are 0.80 W/m ? K (concrete) and 0.040 W/m ? K (wood). What should be the thickness of the layer of wood? A) 100 mm B) 90 mm C) 60 mm D) 70 mm E) 80 mm