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soldi70 [24.7K]
2 years ago
10

Why should a physical quantity be measured?​

Physics
1 answer:
Natasha_Volkova [10]2 years ago
8 0

Answer:

It allows us to understand nature much more deeply than does qualitative description alone.

Explanation:

Without explaining the measurements, a quantity cannot always be measured.

Hope this helped, and please mark as Brainliest :)

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A flat sheet is in the shape of a rectangle with sides of lengths 0.400 m and 0.600 m. The sheet is immersed in a uniform electr
Katen [24]

Answer:

ФE = 9.403W

Explanation:

In order to calculate the magnitude of the electric flux trough the sheet, you use the following formula:

\Phi_E=\vec{A}\cdot \vec{E}=AEcos\theta       (1)

A: area of the rectangular sheet = (0.400m)(0.600m) = 0.24m^2

E: magnitude of the electric field = 95.0N/C

θ: angle between the direction of the electric field and the normal to the surface of the sheet

You replace the values of the parameters in the equation (1):

\Phi_E=(0.24m^2)(95.0N/m)cos(20\°)=9.304W

The magnitude of the electric flux is trough the sheet is 9.403W

5 0
3 years ago
An amount of work W is done on an object of mass m initially at rest, and as result it winds up moving at speed v. Suppose inste
sesenic [268]

Answer:

Explanation:

Given

W amount of work is done on the system such that it acquires v velocity after operation(initial velocity)

According to work energy theorem work done by all the forces is equal to change in kinetic energy of object

W=\frac{1}{2}mv^2---1

where m=mass of object

v=velocity of object

When the object is already have velocity v then the final speed is given by work energy theorem

W=\frac{1}{2}mv_f^2-\frac{1}{2}mv^2-----2

From 1 and 2 we get

\frac{1}{2}mv^2=\frac{1}{2}mv_f^2-\frac{1}{2}mv^2

2\times \frac{1}{2}mv^2=\frac{1}{2}mv_f^2

v_f^2=2v^2

v_f=\sqrt{2}v                

8 0
3 years ago
Object with more momentum will take
inn [45]

Answer:

240 kg * m/s

Explanation:

Given

mass (m) = 60 kg

velocity (v) = 4 m/s

Momentum = ?

We know that

Momentum is the product of mass and velocity so

Momentum = m * v

                   = 60 * 4

                   = 240 kg * m/s

Hope it helps :)

3 0
3 years ago
A body starts with a velocity of 20 m/s, accelerates uniformly for a time t, moves with constant velocity for the same time, and
Bezzdna [24]

Answer:

t=0.14s

Explanation:

  • t=
  • <em><u>\frac{s}{v}</u></em>
  • <em><u>t</u></em><em><u>=</u></em>
  • <em><u>\frac{20}{140}</u></em>
  • <em><u>Where</u></em><em><u> </u></em><em><u>s</u></em><em><u>=</u></em><em><u> </u></em><em><u>speed</u></em>
  • <em><u>V</u></em><em><u>=</u></em><em><u>distance</u></em><em><u> </u></em>
  • <em><u>And</u></em><em><u> </u></em><em><u>t</u></em><em><u>=</u></em><em><u>time</u></em><em><u> </u></em>
7 0
3 years ago
As a pendulum swings back and forth __________.
Evgesh-ka [11]

Answer:

E. All of the above.

Explanation:

These are the equations for potential (PE) and kinetic energy (KE):

PE = m · g · h

Where:

m = mass of the object.

g = acceleration due to gravity.

h = height.

KE = 1/2 · m · v²

Where:

m = mass.

v = speed.

At the end points of its swings, the pendulum is at its maximum height and its velocity is zero (for an instant). Then all the energy at these points is potential (answer B).

As the pendulum swings back from the end point it starts to lose height and acquires kinetic energy until it reaches the lowest part of the of its swing. At this point, all the potential energy was transformed into kinetic energy. The potential energy will be zero (because the height is zero) and due to energy conservation, the energy that once was potential energy has to be transformed into some kind of energy, in this case, into kinetic energy (we assume there is no air resistance, in which case some energy would be transformed into thermal energy as well, i.e., heat). (answer A and D).

After the lowest point, the pendulum acquires height (potential energy increases) and, due to the acceleration of gravity, it starts to lose velocity (kinetic energy decreases). Due to conservation of energy, the increase in potential energy must be equal to the decrease in kinetic energy. The kinetic energy is transformed into potential energy (answer C).

Then, the answer is E. All answers are correct.

4 0
3 years ago
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