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
emmainna [20.7K]
3 years ago
13

A river has a steady speed of 0.480 m/s. a student swims upstream a distance of 1.00 km and swims back to the starting point. (a

) if the student can swim at a speed of 1.40 m/s in still water, how long does the trip take?
Physics
1 answer:
gregori [183]3 years ago
4 0

Steady speed of river = 0.480 m/s

Swimming speed of student in still water = 1.40 m/s  

When the student is swimming upstream the  velocity he is going up = 1.40-0.48= 0.92 m/s

When the student is swimming downstream the  velocity he is going down = 1.40+0.48= 1.88 m/s

Time taken to travel upstream = \frac{1000}{0.92} =1087 seconds = 18.12 minutes

Time taken to travel downstream = \frac{1000}{1.88} =592 seconds = 8.87 minutes

Total time taken = 18.12+8.87 = 26.99 minutes

You might be interested in
10. when creating a cardiovascular fitness routine which program would be appropriate?
sasho [114]

Answer:

10. B

13. It's actually 30 seconds but 20 comes closest so B

14. B, any type of stretching is good before you perform any type of physical activity because it loosens up the muscles

15. D, all of the above

Explanation:

I have done many sports in my life and am still very active, I grew to know most of these things through the years.

5 0
3 years ago
a 1000 khz am radio station broadcasts with a power of 20 kw. how many photons does the transmitter antenna emit each second
Gemiola [76]

1000 khz am radio station broadcasts with a power of 20 kw number of photon emitted per second is 30.16 x 10^30 photon/s.

The frequency of the radio station is:
f
=
1000
k
H
z
=
 1
×
10^6Hz
The transmit power is: P = 20kW = 20 X 10^3 W

The transmit power is: h = 6.63 x 10 ^-34 m^2.kg/s

The number of photon emitted per second = N = P/hf = <u>30.16 x 10^30 </u>photon/s.

1000 khz am radio station broadcasts with a photon of 20 kw1000 khz am radio station broadcasts with a power of 20 kw1000 khz am radio station broadcasts with a power of 20 kw1000 khz am radio station broadcasts with a power of 20 kw1000 khz am radio station broadcasts with a power of 20 kw.1000 khz am radio station broadcasts with a power of 20 kw1000 khz am radio station broadcasts with a power of 20 kw1000 khz am radio station broadcasts with a power of 20 kw.


Learn more about photon on:
brainly.com/question/20912241

#SPJ4

6 0
1 year ago
A ball falling through the air has what?
AysviL [449]
A ball falling through the air has a mass, a density, a volume...it is facing air resistance and is being acted on by gravity...it is accelerating and gaining velocity...and it is increasing in kinetic energy.
I suppose out of all those the biggest thing the ball has in this case is ENERGY. There are two main types to focus on...

Kinetic Energy - The further the ball fall the more KE it has...until terminal velocity is reach, then KE would become constant. 
Potential Energy - Conversely to that of KE, the further the ball falls the less PE it will have. 

<em>Heat/Thermal Energy is technically also present due to the friction from the air resistance, but the transfer of energy between the air and ball is quite complex and not necessary important for basic physics.  
</em>
The question itself seem kind of vague and open ended, but I could just be viewing it the wrong way. 
Comment if you need more help! 
8 0
3 years ago
How many protons does the largest transition metal have in its nucleus?
xxMikexx [17]
The largest transition metal is copernicium with 112 protons.
3 0
3 years ago
A student has designed a circuit with one battery, two light bulbs, and two switches, pictured to the left. She would like for e
Gnoma [55]

Answer:

The bulb is not powered because the negative end of the battery is not connected to the electric current,making it dysfunctional. The electrons have to flow through the positive and negative ends of the battery in order for it to work.

Hope this helps.

5 0
3 years ago
Read 2 more answers
Other questions:
  • What needs to remain constant for Boyle's law to hold true?
    10·2 answers
  • A snail is at the bottom of a well, 115 feet deep. On day 1, it starts climbing up the side. That night it rests and slips down
    11·1 answer
  • What does K stand for in Hookes law?
    12·2 answers
  • When a hypothesis is wrong, scientists often begin by revising the (blank)
    12·2 answers
  • For the parallel plates mentioned above, the DC power supply is set to 31.5 Volts and the plate on the right is at x = 14 cm. Wh
    6·1 answer
  • Using water displacement to find volume of an irregular object: A submerged object will displace a volume of water that is equal
    6·1 answer
  • What use do we have for motion diagrams?
    6·1 answer
  • What does fissure and conduit have in common?
    15·1 answer
  • A 70 kg person walks 200 m in 4 seconds. What is their momentum?
    10·1 answer
  • A rocket takes off from Earth's surface, accelerating straight up at 47.2 m/s2. Calculate the normal force (in N) acting on an a
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!