Imagine for a minute that the Moon is held in its orbit about the Earth by electrical forces rather than by gravitation. What electrical charges ?Q on the Earth and +Q on the Moon are necessary to hold the Moon in a circular orbit with a period of 27.3 days? The Earth-Moon distance is 384,000 km and the mass of the Moon is 7.35 × 1022 kg.
What will be an ideal response?
Q = 5.73 × 1013 C
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Power: Rita raises a 10kg package to a height of 2.5 m in 2.0 s.(a) How much work did she do on the package?(b) How much power was expended on the package?(c) If she were to raise the package in 1.0 s rather than 2.0 s, how do the work and power change?
What will be an ideal response?
Order the interior layers of the Sun from hottest to coldest.
A) radiation zone, core, convection zone, photosphere B) core, radiation zone, convection zone, photosphere C) photosphere, convection zone, radiation zone, core D) photosphere, convection zone, core, radiation zone
The specific heat capacity of a substance is the amount of energy required to raise 1 kg of the substance by a temperature of
a. 1°F. b. 10 °C. c. 10 °F. d. 1°C.
Find the magnetic energy stored in the air gap between two very large magnetic pole pieces, one North, one South, each with an area of 100 cm2 . Assume the 0.05-T magnetic field is uniform within the 2-cm gap