Atoms of which group of elements have seven electrons in the outer shell?
a. Noble gases
b. Alkali metals
c. Alkaline earth metals
d. Halogens
d
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Why is the Moon's cycle of phases (the synodic month) longer than the Moon's orbital period (the sidereal month)?
A) The Moon completes the cycle of lunar phases before it completes a full orbit around Earth. B) The Moon has to complete more than one full orbit around Earth to complete the cycle of lunar phases. C) The Moon orbits Earth faster than Earth orbits the Sun. D) The Moon orbits Earth faster than Earth rotates. E) The lunar month is based on the Moon's orbit, while the sidereal month is based on Earth's orbit.
A cube is 1.0 inch in length on the side (1 in = 2.540 cm). The volume of the cube is
a. 
b. 
c. 
d. 
In Active Figure 30.7, assume I1 = 2.00 A and I2 = 6.00 A. What is the relationship between the magnitude F1 of the force exerted on wire 1 and the magnitude F2 of the force exerted on wire 2?
Two electric charges QA = + 1.0 ?C and QB= - 2.0 ?C are located 0.50 m apart. How much work is needed to move the charges apart and double the distance between them?
A) -36 × 10-3J B) +18 × 10-3 C) 0 D) +36 × 10-3 E) -18 × 10-3