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3 years ago

14

A boulder and a pebble are sitting on a cliff, which has greater gravitational potential energy and why? A cheetah and a person

are racing, both has the same mass, which has a greater kinetic energy and why?

1 answer:

Licemer1 [7]3 years ago

5 0

The answer a boulder has more mass and stuff like that.

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The heating element of an iron operates at 110 V with a current of 9A. (a) What is the resistance of the iron?

Dmitrij [34]

Answer:

(A) 12.222 ohm (B) 990 W

Explanation:

We have given the voltage of the heating element V = 110 V

The current in the heating element i = 9 A

(a) According to ohm's law V =iR

So $110=9\times R$

$R=\frac{110}{9}=12.222ohm$

(b) The power dissipated in the resistor is given by $P=i^2R=9^2\times 12.222=990W$

So the power dissipated = 990 W

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3 years ago

Uuse Lenz's law to explore what happens when an electromagnet is activated a short distance from a wire loop. You will need to u

Alex777 [14]

Answer:

Explanation:

According to the Fleming's right hand rule, if we spread our right hand such that the thumb, fore finger and the middle finger are mutually perpendicular to each other, then the thumb indicates the direction of force, fore finger indicates the direction of magnetic field, then the middle finger indicates the direction of induced current.

According to the Lenz's law, the direction of induced emf is such that it always opposes the cause due to which it is produced.

4 0

3 years ago

A green object A. absorbs green light. B. reflects green light. C. absorbs yellow and blue light. D. reflects red and blue light

Monica [59]

the correct answer is c from the choices shown

8 0

3 years ago

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How can "Ali" distinguish the interference patterns produced by diffraction gratings from the interference patterns produced by

I am Lyosha [343]

Answer:

The interference pattern from a diffraction grating will have a wide, central bright band with alternate dark and bright bands on both sides, and the interference pattern will have an equally spaced dark and bright band.

Explanation:

In diffraction pattern we know that the distance between two consecutive minimum position is maximum

So here position of minimum is given as

$asin\theta = N\lambda$

now we have central maximum is of maximum width while all other have width of decreasing order.

While when we use Young's double slit pattern then we can say that position of all maximum and minimum intensity on the screen will be at same distance.

so here we have

$y = \frac{N\lambda L}{d}$

so all the maximum and minimum intensity will have equal width.

3 0

3 years ago

A flexible loop has a radius of 10.5 cm and it is in a magnetic field of B = 0.117 T. The loop is grasped at points A and B and

MAXImum [283]

Explanation:

Given that,

Radius = 10.5 cm

Magnetic field = 0.117 T

Time = 0.243 s

After stretched, area is zero

(I). We need to calculate the magnetic flux through the loop before stretched

Using formula of magnetic flux

$\phi=B\times A$

$\phi=B\times \pi r^2$

Where, B = magnetic field

r = radius

Put the value into the formula

$\phi=0.117\times3.14\times(10.5\times10^{-2})^2$

$\phi=4.05\times10^{-3}\ Tm^2$

(II). We need to calculate the magnetic flux through the loop after stretched

$\phi=B\times A$

Here, A = 0

$\phi=0$

So, The magnetic flux through the loop after stretched is zero.

(III). We need to calculate the magnitude of the average induced electromotive force

Using formula of the induced electromotive force

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

$\epsilon=-\dfrac{\phi_{after}-\phi_{before}}{t}$

$\epsilon=-\dfrac{0-4.05\times10^{-3}}{0.243}$

$\epsilon =16.67\times10^{-3}\ V$

Hence, This is the required solution.

3 0

3 years ago