A heat engine absorbs 64 kcal of heat each cycle and exhausts 42 kcal

(a) Calculate the efficiency each cycle.
(b) Calculate the work done each cycle.


(a) 34%
(b) 22 kcal

Physics & Space Science

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A highly ionized atom with Z = 5 has only one electron left around it, in its ground state. How much more energy is required to finish the job and have a bare nucleus?

A) 13.1 eV B) 10.9 eV C) 340.0 eV D) 68.0 eV

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The correct form of Ampere's law for circuits with gaps in them is

A.

.

B.
.

C.
.

D.
.

E.
.

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Power: A resistance heater is rated at 1200 W when operating at 110 V dc. What current will it draw?

A. 0.090 A B. 1.0 A C. 11 A D. 12 A

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What is the importance of the carbon dioxide (CO2 ) cycle?

A) It makes the growth of continents possible. B) It allows for an ultraviolet-absorbing stratosphere. C) It regulates the carbon dioxide concentration of our atmosphere, keeping temperatures moderate. D) It will prevent us from suffering any consequences from global warming.

Physics & Space Science