Microphones and loudspeakers are used in an auditorium because the sound waves at the stage compared to the sound waves at the b
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Answer:
b) tan a = 3
Explanation:
Draw a free body diagram (see attached).
There are three forces acting on the insect. Weight downwards, normal force towards the center of the hemisphere, and friction tangent to the surface.
Sum of the forces in the radial direction:
∑F = ma
N − mg cos α = 0
N = mg cos α
Sum of the forces in the tangential direction:
∑F = ma
μN − mg sin α = 0
Substituting:
μ(mg cos α) − mg sin α = 0
μ cos α − sin α = 0
μ cos α = sin α
μ = tan α
The maximum possible value of the angle is such that its tangent is equal to the coefficient of friction.
Explanation:
The answer is In the picture. Thanks.
Answer:
6.81*10^-20 J
Explanation:
The energy from the light does two things: it removes the electrons from the surface of the metal and the rest is taken up as kinetic energy by the electrons.
K.E = hf - work function