Three coplanar parallel straight wires carry equal currents I to the right as shown below. 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.
e
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What is the wavelength of the longest wavelength light that can be seen with the human eye?
a. 400 nm b. 4000 nm c. 7000 nm d. 700 nm e. 3×10^8 m
Galileo believed the natural laws were best understood by _____.
A. logic B. experiment C. inertia D. forces
The light radiated from the Sun's surface reaches Earth in about 8 minutes. However, the energy of this light was released by fusion in the Sun's core about
A) 8 minutes ago. B) several thousand years ago. C) 11 years ago. D) several hundred years ago. E) several hundred thousand years ago.
You are in distant space. A giant boulder, many times larger than you, is at rest in front of you. You tap the boulder lightly with a small hammer. What does the boulder do?
A) It accelerates during the tap, up to a slow speed [slower than walking speed], then keeps moving at that speed. B) It accelerates both during and after the tap. C) It accelerates during the tap, up to a high speed [faster than a fast-moving car], then keeps moving at that speed. D) It remains at rest. E) It speeds up a little during the tap, but after the tap it soon [within a few minutes] slows down and comes to rest.