Consider a container of 2.0 g of hydrogen, H2 (one mole). Suppose you removed all the electrons and moved them to the other side of the earth
(Earth's radius is 6380 km, k = 1/4??0 = 9.0 × 109 N ? m2/C2, NA = 6.022 × 1023 molecules/mol, e = 1.60 × 10-19 C)
(a) How much charge is left behind after you remove the electrons?
(b) What electric force do the protons exert on the electrons after they are separated as described?
(a) 1.9 × 105 C (b) 2.1 MN
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How does the fraction of oxygen in Earth's atmosphere today compare to what it was 3 billion years ago?
a. It has significantly declined. b. It has significantly increased. c. It kept increasing up to 2 billion years ago but has been declining ever since. d. It hasn't changed.
Suppose we imagine the Sun to be about the size of a grapefruit. How big an area would the orbits of the eight planets of the solar system cover?
A) the size of a typical dorm room B) the size of a typical campus building C) the size of a typical campus D) the size of a small city E) the size of a western state (e.g., Colorado)
The proton is believed to consist of what quark combination? (up, down, strange, charm, top, bottom)
A) uud B) ddu C) uds D) ttb E) bbt
Which is the BEST description of what causes tides?
a. Tides are caused by the Moon's gravitational pull on the Earth. b. Tides are caused by earthquakes. c. Tides are caused by the rotation of the Earth. d. Tides are caused by the gravitational pull of the Earth-Moon system. e. Tides are caused by the Earth's gravitational pull on the Moon.