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3 years ago

What factors affect the frictional force between objects ?

Physics

1 answer:

g100num [7]3 years ago

4 0

Well it should be Material and weight not sure

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A rotating wheel requires 5.00 s to rotate 28.0 revolutions. Its angular velocity at the end of the 5.00-s interval is 96.0 rad/

torisob [31]

Answer:

The constant angular acceleration of the wheel is 12.16 rad/s²

Explanation:

Given;

initial angular distance, θ = 28

time of the motion, t = 5 s

initial angular velocity is calculated as;

$\omega _i = \frac{\theta}{t} = \frac{28}{5}.\frac{rev}{s} \ \times \ \ \frac{2 \pi \ rad}{1 \ \ rev} = 35.19 \ rad/s$

final angular velocity is given as, $\omega _f = 96.0 \ rad/s$

The constant angular acceleration is calculated as;

$\alpha = \frac{\omega _f - \omega _i}{t} \\\\\alpha = \frac{96 - 35.19}{5} \\\\\alpha = 12.16 \ rad/s^2$

Therefore, the constant angular acceleration of the wheel is 12.16 rad/s²

6 0

3 years ago

The lifting force, F, exerted on an airplane wing varies jointly as the area, A, of the wing's surface and the square of the pla

Mrrafil [7]

Answer:

F'=708.53 N

Explanation:

We have,

The lifting force, F, exerted on an airplane wing varies jointly as the area, A, of the wing's surface and the square of the plane's velocity, v. It means tat,

$F=kAv^2$

k is constant

If, A = 190 Ft², v = 220 mph, F = 950 pounds

Let's find k first from above data. So,

$k=\dfrac{F}{Av^2}\\\\k=\dfrac{950}{190\times 220^2}\\\\k=0.0001033$

It is required to find the lifting force on the wing if the plane slows down to 190 miles per hour. Let F' is the new force. So,

$F'=0.0001033\times 190\times (190)^2\\\\F'=708.53\ \text{pounds}$

So, the lifting force is 708.53 pounds if the plane slows down to 190 miles per hour.

3 0

3 years ago

What is the source of heat when ironing a shirt

trapecia [35]

The primary method of heat transfer when ironing clothes is conduction. The iron heats up very quickly because it is metal, which is a good conductor.

5 0

3 years ago

Can someone help me with the physics problem?:

Mamont248 [21]

The work you put into something is the energy it has afterward (neglecting friction and other so-called non-conservative forces). This is called the work-energy theorem. Think of objects in a gravitational field as "energy piggy banks". If you put X joules of energy into it, that energy will be there as potential energy, stored for later. So if you do 144J of work to elevate the bucket from an initial position, what ever it is initially, the final gravitational energy is 144J greater than before.

6 0

4 years ago

Which two scientists are credited for the invention of the first microscope? Check all that apply.

vivado [14]

Need more info.
What were the choices?

7 0

3 years ago