Almost all of the complex molecules found in space are based on ________ atoms
A) hydrogen B) iron C) carbon D) oxygen E) silicon
C
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What do the three black arrows represent?
A) the tidal force Earth exerts on the Moon B) the Moon's gravitational force at different points on Earth C) the direction in which Earth's water is flowing D) Earth's orbital motion
Intensity of Sound: A long-term exposure to the sound of a riveting machine can cause your threshold of hearing to shift from 0 dB to 30 dB. What is the sound intensity of a 30-dB sound? The normal lowest detectable intensity is 1.0 × 10-12 W/m2.
Fill in the blank(s) with the appropriate word(s).
Three coplanar parallel straight wires carry equal currents I to the right as shown below. The current in the upper two wires is directed to the right, but the current in the bottom wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.
If the weight of an object with mass m is given by W = mg on Earth's surface, what will its weight be inside an airplane at an altitude of 35,000 feet?
a. The same. b. It will be slightly less because g is somewhat smaller at that height. c. It will be slightly more because of the increased potential energy.