Consider a container of 2.0 grams of hydrogen (one gram mole). Suppose you removed all the electrons and moved them to the other side of the Earth (Earth diameter 12740. Km)
(a) How much charge is left behind?
(b) What is the attractive force between the protons here and the electrons at the other side of the Earth?
(a) 1.9 × 105 Coulombs
(b) 2.1 × 106 Newtons = 2.1 × 102 tons!
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Waves on a String: A 1.1-kg uniform bar of metal is 0.40 m long and has a diameter of 2.0 cm. When someone bangs one end of this bar, a 1.5 MHz shock wave is travels along the length of the bar and reaches the other end in 0.12 ms. What is the wavelength of the shock wave in the metal?
A. 2.2 mm B. 2.6 mm C. 3.0 mm D. 3.4 mm E. 3.8 mm
You can get a sunburn while under the "shade" of a beach umbrella due to
A) reflected sunlight from the sand. B) refracted sunlight from the water. C) light scattering in the air. D) none of the above
In science, an unexpected change in a series of measurements is referred to as
A) a deviation B) bias C) an error D) an uncertainty
The predominant gas in the atmosphere of Earth is
A) oxygen. B) nitrogen. C) water vapor. D) carbon dioxide. E) methane.