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3 years ago

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A block weighing 15N rest on a flat surface and a horizontal force of 3N is exerted on it. Determine the frictional force on the

block

1 answer:

Ipatiy [6.2K]3 years ago

7 0

The answer you are looking for is 3.0N

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Sir Isaac Newton determined that gravity has a fixed acceleration on Earth. The earth pulls objects towards it with a fixed acce

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A. Scientific Law. The mathematics surrounding the acceleration due to gravity is a law. It is calculated from the universal law of gravity. However, the explanation of the idea of gravity is a theory. This falls back to the idea that science is about disproving ideas that we currently believe, rather than proving ideas are correct. Unless we can disprove an idea, we have to accept the possibility that it is true; the more trials we have of being unable to disprove something, the more accepted it will be. Yet, no idea can be without doubt and certainty be accepted for what it is. So, to sum it up, scientific laws are factual descriptions (by formula or word) of phenomenon which always occur given specific conditions. On the other hand, scientific theories are explanations of the causes underlying these phenomena, the explanation formulated in such a way that they can be disproven.

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3 years ago

Read 2 more answers

WHAT ELEMENT CAN FORM A POSITIVE ION

Svetach [21]

Any metal element can form a positive ion because they lose electrons to become stabilized

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4 years ago

You and I see, hear, and think with ___________________________. Waves carry _____________________. The wave in the speaker, on

kondaur [170]

Answer:

eyes heard and brain., Energy, different ___ forms of the same energy,

less ___ the wavelength

Explanation:

In this exercise you are asked to complete the sentences.

You and I see, hear, and think with eyes heard and brain.

Waves carry Energy _______.

The wave in the speaker, on the screen, in the air, and in the string are all _

different ___ forms of the same energy.

They are all waves. Low frequency waves are __

amount of energy ____________ apart.

The faster you vibrate the spring, the __less ___ the wavelength will be. Energy travels through the wave out in ___all________ directions.

All waves have a similar ___form and equation ____ of electromagnetic waves are light , x-rays, microwaves, radar, radio and television signals. ___X-Ray and gamma______ have so much energy that they can go through your skin and muscle until they hit your bone.

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3 years ago

A cord is wrapped around the outer surface of the 8-kg disk. If a force of F = (1⁄4u2) N, where u is in radians, is applied to t

Soloha48 [4]

A cord is wrapped around the outer surface of the 8-kg disk. If a force of F = (1⁄4θ²) N, where θ is in radians, is applied to the cord, determine the disk’s angular acceleration when it has turned 5 revolutions. The disc has an initial angular velocity $\omega _o = 1 \ rad/s$ and radius from the center of the disc = 300 mm

Answer:

the angular acceleration = 205.706 rad/sec²

Explanation:

GIVEN THAT:

The disc mass = 8 kg

Force = $\dfrac{1}{4} \ \ \theta ^2* N$

We are told that the given θ is in radians; Therefore; the when it has turned 5 revolutions; we have the θ to be:

$\theta = 5 rev * (\dfrac{2 \ \pi * rad}{1 rev}) \\ \\ \theta = 10 \ \pi \ rad$

Also;

the initial angular velocity $\omega _o = 1 \ rad/s$

radius from the center of the disc = 300 mm = 0.3 m

Thus; the mass moment about the Inertia can be determined via the following expression;

$I_o = \dfrac{1}{2}*m*r^2$

$I_o = \dfrac{1}{2}*8*0.3^2$

$I_o = 0.36 \ kg/m^3$

Now to calculate the angular acceleration; we equate the sum of the moments acting on the Inertia;

SO:

$\sum M_o = I_o \alpha$

$F*0.3 = 0.36* \alpha$

$\dfrac{1}{2}* \theta^2 *0.3 = 0.36* \alpha$

$\alpha = 0.20836 \ \theta^2 \ rad/sec^2$

$\alpha = 0.20836 \ (10 \ \pi )^2 \ rad/sec^2$

$\alpha = 205.706 \ rad/sec^2$

Hence; the angular acceleration = 205.706 rad/sec²

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3 years ago

What is the current if a charge of 25 coulombs passes in 5 seconds?

Jobisdone [24]

Answer: 5 amps

Explanation: I = Q/t

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3 years ago