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3 years ago

1. Physics is the study of_

Physics

1 answer:

Alexeev081 [22]3 years ago

5 0

Answer:

Explanation:

1. Physics is the study of mass , energy and their mutual relationship.

2. List the fundamental Sl (metric) units for:

time - s,

displacement - m,

velocity - ms,

acceleration- m/s2,

force - N,

weight - Kg,

mass- kg

friction - N.

3. On a "position vs. time" graph, how is velocity found?

A straight line will obtained.

4. On a "position vs. time" graph, how is acceleration represented?

Under the slope of straight line.

5. 32,000 m = 32km

25 m/s = 55.9 miles/hr

50 km/hr = 13.9m/s

6. (2.0 x 105 km) (3.1 x 1012 m) = 658 812 000 m2

7. Describe the motion of the object whose velocity is illustrated in the graph below:

velocity

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The component of the external magnetic field along the central axis of a 78-turn circular coil of radius 34.0 cm decreases from

grigory [225]

Answer:

Induced current, I = 18.88 A

Explanation:

It is given that,

Number of turns, N = 78

Radius of the circular coil, r = 34 cm = 0.34 m

Magnetic field changes from 2.4 T to 0.4 T in 2 s.

Resistance of the coil, R = 1.5 ohms

We need to find the magnitude of the induced current in the coil. The induced emf is given by :

$\epsilon=-N\dfrac{d\phi}{dt}$

Where

$\dfrac{d\phi}{dt}$ is the rate of change of magnetic flux,

And $\phi=BA$

$\epsilon=-NA\dfrac{dB}{dt}$

$\epsilon=-78\times \pi (0.34)^2\dfrac{(0.4-2.4)}{2}$

$\epsilon=28.32\ V$

Using Ohm's law, $\epsilon=I\times R$

Induced current, $I=\dfrac{\epsilon}{R}$

$I=\dfrac{28.32}{1.5}$

I = 18.88 A

So, the magnitude of the induced current in the coil is 18.88 A. Hence, this is the required solution.

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3 years ago