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3 years ago

When the trough of one light wave meets the crest of another light wave, __________ occurs.

Physics

2 answers:

alina1380 [7]3 years ago

7 0

Answer:

B Destructive Interference

padilas [110]3 years ago

5 0

I took the test, its constructive interference

Edit: this is kind of a trick question. took the test again it was the same question yet this time the answer was destructive. Good luck with that

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A 200-Ω resistor is connected in series with a 10-µF capacitor and a 60-Hz, 120-V (rms) line voltage. If electrical energy costs

Vika [28.1K]

Answer:

Cost to leave this circuit connected for 24 hours is $ 3.12.

Explanation:

We know that,

$\mathrm{X}_{\mathrm{c}}=\frac{1}{2 \pi \mathrm{fc}}$

f = frequency (60 Hz)

c= capacitor (10 µF = $10^-6$ )

$\mathrm{X}_{\mathrm{c}}=\text { Capacitive reactance }$

Substitute the given values

$\mathrm{X}_{\mathrm{c}}=\frac{1}{2 \times 3.14 \times 10 \times 10^{-6} \times 60}$

$\mathrm{X}_{\mathrm{c}}=\frac{1}{3.768 \times 10^{-3}}$

$\mathrm{x}_{\mathrm{c}}=265.39 \Omega$

Given that, R = 200 Ω

$X^{2}=R^{2}+X c^{2}$

$X^{2}=200^{2}+265.39^{2}$

$X^{2}=40000+70431.85$

$X^{2}=110431.825$

$x=\sqrt{110431.825}$

X = 332.31 Ω

$\text { Current }(I)=\frac{V}{R}$

$\text { Current }(I)=\frac{120}{332.31}$

Current (I) = 0.361 amps

“Real power” is only consumed in the resistor,

$\mathrm{I}^{2} \mathrm{R}=0.361^{2} \times 200$

$\mathrm{I}^{2} \mathrm{R}=0.1303 \times 200$

$\mathrm{I}^{2} \mathrm{R}=26.06 \mathrm{Watts} \sim 26 \mathrm{watts}$

In one hour 26 watt hours are used.

Energy used in 54 hours = 26 × 24 = 624 watt hours

E = 0.624 kilowatt hours

Cost = (5)(0.624) = 3.12

3 0

2 years ago

A wave has 25 wavelengths in 5 secs. The frequency of the wave is _.

kati45 [8]

Heyyyy I wish I could help but I don’t know

7 0

2 years ago

After leaving the end of a ski ramp, a ski jumper lands downhill at a point that is displaced 68.3 m horizontally from the end o

inessss [21]

Answer:

a)52.58 m/s

b)56.13°

Explanation:

assume the upward direction as positive

x-component of the velocity = 29.3×cos33.6°=24.40 m/s (remain constant)

y-component of the velocity which is -29.3sin33.6°= -16.21 m/s

time of flight = 68.3/24.40= 2.7991 seconds

now, we can obtain final velocity in y-direction

$v_f_y= v_i_y-gt$

$v_f_y=-16.21-(-9.8)×2.7991$

=43.66 m/s

$v_0=\sqrt{29.3^2+43.66^2}$

=52.58 m/s

for direction

$tan^{-1}\frac{43.66}{29.3}$

56.13° from the horizontal

3 0

2 years ago

What type of elastic force is present in the strings on a guitar?

jeyben [28]

B) Tension , is the correct answer

4 0

2 years ago

What is the force of a punch if it accelerates at 0.2m/s2 and has a mass of 2kg?

OleMash [197]

Answer:

0.4 N

Explanation:

We know ,

F = ma
F = 0.2 * 2 N
F = 0.4N

6 0

3 years ago