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3 years ago

1. If a car travels 400m in 20 seconds how fast is it going?

Physics

1 answer:

Marrrta [24]3 years ago

5 0

Answer:

1) 20 m/s

2) 5 m/s

3) 2 m/s

4) 395,000m/9000s

5) 16 km/0.25h

Explanation:

i dunno

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A bike travels at a constant speed for 4.00 m/s for 5.00 seconds. How far does it go

Umnica [9.8K]

Answer:

20 m

Explanation:

4.00 m/s x 5 seconds

4 m/s x 5 s = 20m

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3 years ago

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True or false Mechanical energy is associated only with the motion of an object.

Katyanochek1 [597]

False ,it does not only associate with motion of object

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3 years ago

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A solenoid of radius r 5 1.25 cm and length , 5 30.0 cm has 300 turns and carries 12.0 A. (a) Calculate the flux through the sur

Elina [12.6K]

Answer:

$\phi = 7.4 \times 10^{-6} Wb$

Explanation:

Magnetic field due to a long solenoid at the center is given by

$B = \frac{\mu_o N i}{L}$

here we know that

N = 300

L = 30 cm

i = 12 A

now magnetic field is given as

$B = \frac{(4\pi \times 10^{-7})(300)(12)}{0.30}$

$B = 0.015 T$

Now magnetic flux through the disc is given as

$\phi = B.A$

$\phi = (0.015)(\pi r^2)$

$\phi = (0.015)(\pi)(0.0125)^2$

$\phi = 7.4 \times 10^{-6} Wb$

8 0

3 years ago

name three sources of energy that can be absorbed by atoms to produce light. which source is used in bioluminescent organisms?

soldi70 [24.7K]

Explanation:

Heat energy

Solar energy

Electrical energy

Energy is the ability to do work. There are different forms of energy and they can be converted from one form to the other.

Heat energy is due to the changes in temperature of a body. When a body is heated, the electrons excite and gives off radiant energy which are visible to human eye. We often see red light when a body is heated.

Solar energy can be absorbed by organisms to produce light. Such an example is bioluminescence in some organisms. During the day, they trap solar energy that they glow with at night.

Electrical energy can also be used to produce light. We often see this in lightning and electrical bulbs in a circuit.

learn more:

Human eye and visible light brainly.com/question/5305525

#learnwithBrainly

3 0

3 years ago

Two people with a combined mass of 127 kg hop into an old car with worn-out shock absorbers. This causes the springs to compress

Elena-2011 [213]

Answer:

Total load = 2999.126 kg

Explanation:

Let the spring constant of the shock absorber be k.

We know that the force applied on a spring is directly proportional to elongated length and the constant of proportionality is called spring constant.

Thus

Force, F = kx

where,

x = elongation = 9.1 cm 0.091 m

mass of the people, m = 127 kg

F = weight of the people = mg = 127 x 9.8 = 1244.6 N

substituting these values in the first equation,

1244.6 = k x 0.091

thus, k = 13,676.923 N/m

Now we know that the time period, T of an oscillating spring with a load of mass m is

$T = 2\pi \sqrt{\frac{m}{k} }$

$\frac{m}{k} = \frac{T^{2} }{4\pi ^{2} }$

thus,

$m = k\frac{T^{2} }{4\pi ^{2}}$

T = 1.66s

substituting these values in the equation,

$m =13,676.923\frac{1.66^{2} }{4\pi ^{2} }$

m = 2999.126 kg

3 0

3 years ago