3 years ago

I am literally so confused on what the question is asking halp :(

Physics

1 answer:

svetlana [45]3 years ago

7 0

Answer:

c) 20km/h

this is your answer. l want to Tell you that your profile is good

please mark as a brainliest

You might be interested in

arlik [135]

2b2t hope that helps

5 0

3 years ago

A sound has 13 crests and 15 troughs in 3 seconds. When the second crest is produced the first is 2cm away from the source? Calc

Yuki888 [10]

Answer:

The wavelength will be 4 cm, frequency will be 4.66 Hz and wave speed is 18.6 cm/sec

Explanation:

Given:

No. of crest = 13

No. of trough = 15

Time = 3 seconds

Hence, 1 crest or 1 trough = $\frac{1}{2}\lambda$

therefore,

13 C + 15 T = $28(\frac{1}{2}\lambda)$

= $14\lambda$

Time given 3 seconds

= $\frac{3}{14}s$

$\nu= \frac{14}{3}$

$\nu= 4.6 Hz \approx 5 Hz$

2 cm distance is travelled is time period

$\lambda = 4 cm$

Again wave will travel in 1 T = 4 cm

wave speed v = $\lambda\times\nu$

= $4\times\frac{14}{3}$

= 18.6 cm/s

5 0

3 years ago

An automatic focus camera is able to focus on objects by use of an ultrasonic sound wave. The camera sends out sound waves that

JulsSmile [24]

Answer:

Explanation:

to keep it simple here is practically how i got it

340x.15=51

6 0

4 years ago

Which planets can never be seen at midnight? A. The Superior planets. B. The Inferior planets C. All planets can be seen at midn

sweet-ann [11.9K]

Answer:

Explanation:

Superior planets are further away from the sun than the Inferior planets making the superior planets easier to see at midnight.

7 0

4 years ago

17.) A microwave is rated at 750 watts. How long will it take the microwave to do 5700 J of work on a cup of water? Assume 100%

Lubov Fominskaja [6]

To answer the question above, we make use of the equation,
Work = Power x time
From the equation, time may be solved through
time = Work / Power
Substituting the known values from the given,
time = (5700 J) / (750 J/s)
= 7.6 s

7 0

3 years ago