3 years ago

(A) State the relation between acceleration and momentum (10 marks).

Physics

1 answer:

ohaa [14]3 years ago

4 0

Answer:

momentum is directly proportional to acceleration

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The number of protons in an atom is represented by the atomic number.

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A child is riding a merry-go-round that has an instantaneous angular speed of 12 rpm. If a constant friction torque of 12.5 Nm i

sammy [17]

Answer:

$-0.25 rad/s^2$

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The equivalent of Newton's second law for rotational motions is:

$\tau = I \alpha$

where

$\tau$ is the net torque applied to the object

I is the moment of inertia

$\alpha$ is the angular acceleration

In this problem we have:

$\tau = -12.5 Nm$ (net torque, with a negative sign since it is a friction torque, so it acts in the opposite direction as the motion)

$I=50.0 kg m^2$ is the moment of inertia

Solving for $\alpha$ , we find the angular acceleration:

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3 years ago

A point source emits electromagnetic energy at a rate of 100 W. The intensity 10 m from the source is

MariettaO [177]

Answer:

$I=0.0795\ W/m^2$

Explanation:

Given that,

Power of electromagnetic energy, P = 100 W

We need to find the intensity at a distance of 10 m from the source. Intensity is equal to the power per unit area. So,

$I=\dfrac{P}{4\pi r^2}\\\\I=\dfrac{100}{4\pi (10)^2}\\\\I=0.0795\ W/m^2$

So, the intensity at a distance of 10 m is $0.0795\ W/m^2$

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