If the insulating material in a wall is modified so that the R-value is increased by 50%, how will the rate of energy transferred by conduction through the wall be affected?
1.It will increase by 50%.
2.It will decrease by 50%.
3.It will increase by more than 50%.
4.It will decrease by more than 50%.
4
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3.0 moles of gas expand from an initial volume of 0.040 m3 to a final volume of 0.085 m3 while the temperature of the gas is kept fixed at 300 K. How much work is done by the system?
A) 5.6 kJ B) 6.6 kJ C) 7.6 kJ D) 8.6 kJ E) 14 kJ
When an oxygen-19 nucleus undergoes beta decay, the nucleus formed is that of
a. nitrogen-18. b. oxygen-18. c. fluorine-19. d. carbon-14.
The electric potential inside a charged solid spherical conductor in equilibrium
a. is always zero. b. is constant and equal to its value at the surface. c. decreases from its value at the surface to a value of zero at the center. d. increases from its value at the surface to a value at the center that is a multiple of the potential at the surface. e. is equal to the charge passing through the surface per unit time divided by the resistance.
A pair of protons in an atomic nucleus repel each other, but they are also attracted to each other. Why?
A) The pair repel each other by nuclear force but attract one another by an electrical force. B) The pair repel each other since they are both positively charges but they are held together by much stronger forces known as quarks. C) The pair attract each other by nuclear force but also repel one another by a weaker electrical force. D) Although it is known that protons repel each other at short distances because of like charge, it is not known what actually holds protons together in the nucleus because we have never seen the nucleus of an atom.