A salesman attempts to convince you to purchase a "solar neutrino shield" to protect you and your family. (It's even "on sale!") Why do you turn down this excellent offer?
A) Neutrinos rarely, if ever, interact with other matter.
B) There's no such thing as a solar neutrino.
C) Solar neutrinos are generated by solar winds, but we're in a solar minimum now, so the risk of damage is very low.
D) The Earth's natural magnetic field already offers excellent protection against the onslaught of solar neutrinos.
A) Neutrinos rarely, if ever, interact with other matter.
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A baseball is moving in the air along the customary parabola. Ignoring air drag, where is the force on the baseball zero?
a. at the top of the parabola c. where it is about to impact b. just when it has started upward d. nowhere
If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately
a. 2170 Mpc. b. 2030 Mpc. c. 30 Mpc. d. 0.03 Mpc. e. 147,000 Mpc.
Linear momentum is conserved in all collisions
a. True b. False Indicate whether the statement is true or false
Which of the following is not a major pattern of motion in the solar system?
A) Nearly all comets orbit the Sun in same direction and roughly the same plane. B) Most of the solar system's large moons orbit in their planet's equatorial plane. C) The Sun and most of the planets rotate in the same direction in which the planets orbit the Sun. D) All of the planets orbit the Sun in the same direction—counterclockwise as viewed from above Earth's north pole.