1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Evgen [1.6K]
3 years ago
7

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
(c) If η = 60% and TC = 40°F, what is TH, in °F?
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:

51

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:

A

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
Other questions:
  • Please help answer #14!!!!!!!
    8·1 answer
  • Five metal samples, with equal masses, are heated to 200oC. Each solid is dropped into a beaker containing 200 ml 15oC water. Wh
    5·1 answer
  • Which is mostly an example of pseudoscience
    13·1 answer
  • A particle moves along the x-axis with velocity given by v(t)=3t2+6t for time tâ¥0. If the particle at position x=2 at time t=0,
    9·2 answers
  • A crescent moon appears when
    15·1 answer
  • The Tacoma narrows bridge collapsed due to?
    6·1 answer
  • Which are negative impact that the internal combustion engine has had on society
    9·2 answers
  • A concept is the general idea of objects, events, animals, or people based on common features, traits, or characteristics.
    14·1 answer
  • How does the uneven heating of Earth<br> create global winds?
    15·1 answer
  • In an inductive circuit with an uncorrected power factor of 40 percent to 60 percent, the power factor can be corrected to withi
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!