Helium-neon laser light (? = 6.33 × 10^?7 m) is sent through a 0.30 mm-wide single slit. What is the width of the central maximum on a screen 1.0 m from the slit?
a. 2.0 cm
b. 4.2 mm
c. 1.1 cm
d. 2.0 mm
e. 0.70 mm
b
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A magnetic field of 104 A/m is produced by a coil. What is the intensity of magnetization of the following materials placed into the coil?
(a) Silver (b) Vacuum (c) Air (d) Palladium (e) Nickel
Collisions in Two Dimensions: An 80-kg man is skating northward and happens to suddenly collide with a 20-kg boy who is ice skating toward the east. Immediately after the collision, the man and boy are seen to be moving together at 2.5 m/s in a direction 60° north of east. How fast was the boy moving just before the collision?
Fill in the blank(s) with the appropriate word(s).
The Sun is gradually increasing in luminosity as it ages. It is about 30% more luminous than it was when it was born. Why isn't this increase considered to be an explanation for global warming?
A) The Sun is increasing in luminosity way too slowly, over many millions of years. B) What the Sun was doing millions of years ago is what determines Earth's temperature, since the Earth doesn't respond directly to what the Sun is doing today. C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does. D) The scientists are covering up this potentially valid explanation.
State Kepler's second law
What will be an ideal response?