If the magnetic field of an electromagnetic wave is in the +x-direction and the electric field of the wave is in the +y-direction, the wave is traveling in the
A) xy-plane.
B) +z-direction.
C) -z-direction.
D) -x-direction.
E) -y-direction.
C
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Projectile Motion: A shell is launched with a velocity of 100 m/s at an angle of 30.0° above horizontal from a point on a cliff 50.0 m above a level plain below. How far from the base of the cliff does the shell strike the ground? There is no appreciable air resistance, and g = 9.80 m/s2 at the location of the cliff.
Fill in the blank(s) with the appropriate word(s).
Which is true of the troposphere on Earth?
A) It is the lowest layer in the atmosphere, in which convection occurs. B) It is the region of the atmosphere that absorbs ultraviolet light from the Sun. C) It is the region of the atmosphere that absorbs x-rays from the Sun. D) It is the highest layer in the atmosphere, marking the boundary with space.
When a damping force is applied to a simple harmonic oscillator which has period T0 in the absence of damping, the new period T is such that
a. T < T0. b. T = T0. c. T > T0. d. ?T < ?0T0. e. ?T > ?0T0.
Along with the pH scale, there is the pOH scale, which indicates the level of "basicity" in a solution. Accordingly, pOH = -log[OH-]. What is the sum of the pH and the pOH of a solution always equal to?
A) the negative of the product of the hydronium and hydroxide ions B) the negative log of KW, which is 14 C) The sum would equal 7, since that would be neutral for pH and pOH. D) It is not constant because it depends on the acid/base solution in question.