An electron moves horizontally across the Earth’s equator at a speed of 2.50 × 106 m/s and in a direction 35.08 N of E. At this point, the Earth’s magnetic field has a direction due north, is parallel to the surface, and has a value of 3.00 × 1025 T. What is the force acting on the electron due to its interaction with the Earth’s magnetic field?
1.6.88 × 10-18 N due west
2.6.88 × 10-18 N toward the Earth’s surface
3.9.83 × 10-18 N toward the Earth’s surface
4.9.83 × 10-18 N away from the Earth’s surface
5.4.00 × 10-18 N away from the Earth’s surface
3
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Astronomers have begun to build instruments to detect "cosmic messengers" that are not forms of light, such as neutrinos, cosmic rays, and gravitational waves, because they
A) provide information about distant objects that we cannot obtain from light. B) provide higher angular resolution than we can obtain with light. C) are unaffected by the turbulence of Earth's atmosphere. D) can allow us to see beyond the horizon of the observable universe.
A hypothesis is a very tentative explanation of some ______________ of nature
Fill in the blank(s) with correct word
The ratio of the density of a material to the density of water is the __________
Fill in the blank(s) with correct word
As a stream flows downslope, if stream discharge doubles and the cross-sectional area of the channel also doubles, what happens to the average stream speed?
A) Average stream speed stays the same. B) Average stream speed decreases. C) Average stream speed increases. D) Not enough information is given.