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
zysi [14]
3 years ago
14

A runner runs the first 400m of a race in 80s, the second 400m in 70s and the final 800m in 130s. What was her average speed for

this run?
Physics
1 answer:
-BARSIC- [3]3 years ago
5 0

Answer: The average speed is 5.71 m/s

Explanation:

The average speed in this run will be the quotient between the total distance that the runner traveled, and the total time it took.

Distance = 400m + 400m + 800m = 1600m

Time = 80s + 70s + 130s = 280s

Then the average speed is:

S = 1600m/280s = 5.71 m/s

You might be interested in
Which list of elements contains only metals?
fredd [130]
C. those are all metals.
6 0
3 years ago
Read 2 more answers
The rules and expectations concerning correct or polite behavior is called _______________________.
aalyn [17]
The answer would be etiquette!
7 0
2 years ago
A line from the Brackett series of hydrogen has a wavelength of 1945nm (or 1.0979x10^7m). From which state did the electron orig
Zarrin [17]
We use the Rydberg Equation for this which is expressed as:

<span>1/ lambda = R [ 1/(n2)^2 - 1/(n1)^2]
</span>
where lambda is the wavelength, where n represents the final and initial states. Brackett series means that the initial orbit that electron was there is 4 and R is equal to 1.0979x10^7m<span>. Thus,
</span>
1/ lambda = R [ 1/(n2)^2 - 1/(n1)^2]
1/1.0979x10^7m = 1.0979x10^7m [ 1/(n2)^2 - 1/(4)^2]

Solving for n2, we obtain n=1.
5 0
3 years ago
A camera has a single converging lens with a fixed focal length f. (a) How far should the lens be from the film (or in a present
Varvara68 [4.7K]

Answer:

a) Due to the characteristic that a converging lens focuses light rays from infinity and parallel to its main axis. Therefore, the lens should be placed at a distance "f" from the film, in this way it will form the image of the object placed at infinity in said film.

b) Since the converging lens produces an image of an object placed at a distance of 2f, the lens must be placed at the same distance (2f), so that this object that is placed at a distance of 2f is focused.

Explanation:

4 0
3 years ago
Example of an unbalenced force
lesya692 [45]

Answer:

Explanation:

unbalance force can be defined as the force that makes object slow up or down, in order words unbalanced force can be  defined as anything that can alter the state of motion of an object.

an example of an unbalanced force is likened to a situation of someone inside a lift going for a meeting at the top floor, the force which propels the lift upward is unbalanced, because it is greater than the force acting on the lift.

5 0
3 years ago
Other questions:
  • Dylan has two cubes of iron. The larger cube has twice the mass of the smaller cube. He measures the smaller cube. Its mass is 2
    15·2 answers
  • A dolphin is able to tell in the dark that the ultrasound echoes received from two sharks come from two different objects only i
    9·1 answer
  • A 270,000 kg rocket in gravity -free space expels 270 kg of fuel by exerting a force of 360 N on it. Find the magnitude of the a
    5·1 answer
  • Select the correct answer from each drop-down menu.
    9·2 answers
  • Use what you know about mass and how you use it to calculate force in the following situation. If each washer has a mass of 4.9
    15·2 answers
  • A man goes for a walk, starting from the origin of an xyz coordinate system, with the xy plane horizontal and the x axis eastwar
    5·2 answers
  • What do chefs change with many dishes they serve
    6·1 answer
  • To understand the first law of thermodynamics and its origin. By relating heat, thermal energy, and work, the first law lays the
    14·1 answer
  • What are the basic ethical guidelines for psychological research?
    12·1 answer
  • A boy pushes a 50 kilogram wagon with a force of 4 N east while an orangutan pushes the wagon
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!