Two charges of 15 pC and ?40 pC are inside a cube with sides that are of 0.40-m length. Determine the net electric flux through the surface of the cube
a. +2.8 N / m2/C
b. ?1.1 N / m2/C
c. +1.1 N / m2/C
d. ?2.8 N / m2/C
e. ?0.47 N / m2/C
d
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An object that weighs 2.450 N is attached to an ideal massless spring and undergoes simple harmonic oscillations with a period of 0.640 s. What is the spring constant of the spring?
A) 2.45 N/m B) 12.1 N/m C) 24.1 N/m D) 0.102 N/m E) 0.610 N/m
Earth's average density is about _____
A) 5.5 g/cm3 B) 6.5 g/cm3 C) 7.5 g/cm3 D) 8.5 g/cm3
By what factor is the self-inductance of a solenoid changed if its length is doubled and its number of coil turns is tripled?
a. 2/9 c. 3/4 b. 9/2 d. 4/3
During a lunar eclipse, the Moon, Earth, and Sun all lie on the same line, with the Earth between the Moon and the Sun
The Moon has a mass of 7.36 × 1022 kg; the Earth has a mass of 5.98 × 1024 kg; and the Sun has a mass of 1.99 × 1030 kg. The separation between the Moon and the Earth is given by 3.84 × 108 m; the separation between the Earth and the Sun is given by 1.496 × 1011 m. (a) Calculate the force exerted on the Earth by the Moon. (b) Calculate the force exerted on the Earth by the Sun. (c) Calculate the net force exerted on the Earth by the Moon and the Sun.