Classify the following statement as a characteristic
(a) of electric forces only,
(b) of magnetic forces only,
(c) of both electric and magnetic forces, or
(d) of neither electric nor magnetic forces.
The force is proportional to the magnitude of the charge of the object on which the force is exerted.
1.electric forces
2.magnetic forces
3.both electric and magnetic forces
4.neither electric nor magnetic forces
3
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Charles Messier mapped the night sky and identified many objects now known to be emission nebulae in his search for objects that might be confused with:
A) comets. B) asteroids. C) galaxies. D) dark nebulae. E) reflection nebulae.
A jar holds 2.0 L of ideal nitrogen gas, N2, at STP. The atomic mass of nitrogen is 14.0 g/mol, the ideal gas constant is R = 8.31 J/mol ? K,
Avogadro's number is NA = 6.022 × 1023 molecules/mol, and 1.00 atm = 101 kPa. (a) How many moles of nitrogen are in the jar? (b) How many nitrogen molecules are in the jar? (c) What is the mass of the nitrogen in the jar?
A spring with spring constant k = 800 N/m is compressed 12 cm from its equilibrium position. A spring with spring constant k = 400 N/m has the same elastic potential energy as the first spring when its extension is
a. 0.060 m. b. 0.085 m. c. 0.12 m. d. 0.17 m. e. 0.24 m.
In which direction does the daily motion of the Moon occur in the sky, against the background stars, when viewed from the Earth?
a. toward the west b. toward the east c. toward the north celestial pole in the summer and the south celestial pole in the winter d. No predictable pattern can be discerned.