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3 years ago

_____ bodies help in reducing friction

Physics

2 answers:

Tju [1.3M]3 years ago

8 0

Explanation:

Friction can be reduced by

Polishing the rough surface.

Oiling or lubricating with graphite or grease the moving parts of a machine

Providing all bearings or wheels between the moving parts of a machine or vehicles reduce friction and allow smooth movement as rolling friction is less than sliding friction.

amm18123 years ago

6 0

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A bullet with a mass of 14.5 is shot out of a rifle that has a length 1.08. The bullet spends 0.14 on the barreL. What is the ac

Over [174]

Answer:

110 m/s²

Explanation:

Given:

v₀ = 0 m/s

Δx = 1.08 m

t = 0.14 s

Find: a

Δx = v₀ t + ½ at²

1.08 m = (0 m/s) (0.14 s) + ½ a (0.14 s)²

a = 110 m/s²

7 0

2 years ago

A block of mass 15.0 kg slides down a ramp inclined at 28.0∘ above the horizontal. As it slides, a kinetic friction force of 30.

AURORKA [14]

Answer:

Work is done by friction = -165 J

Explanation:

Given:

Mass of block (m) = 15 kg

Ramp inclined = 28°

Friction force (f) = 30 N

Distance (d) = 5.5 m

Find:

Work is done by friction.

Computation:

Work is done by friction = -Fd

Work is done by friction = -(30)(5.5)

Work is done by friction = -165 J

6 0

3 years ago

An object's distance from a converging lens is 3.78 times the focal length. a) Determine the location of the image. Express the

Romashka-Z-Leto [24]

Answer:

a) v=1.36f

b)m=.36

c) real

d) Inverted

Explanation:

In this question we have given,

object distance from converging lens,u=-3.78f

focal length of converging lens,=f

we have to find location of image,v=?

and magnification,m=?

we know that u, v and f are related by following formula

$\frac{1}{f} =\frac{1}{v}- \frac{1}{u}$ .............(1)

put values of f u in equation (1)

we got,

$\frac{1}{f} =\frac{1}{v}- \frac{1}{-3.78f}$

$\frac{1}{f}-\frac{1}{3.78f} =\frac{1}{v}$

$\frac{2.78}{3.78f} =\frac{1}{v}$

v=1.36f

b) Magnification, $m=\frac{v}{u} \\m=\frac{1.36f}{3.78f}\\m=.36$

Here the object is located further away from the lens than the focal point therefore image is real image and inverted.

d) image is inverted

7 0

3 years ago

The radius of the earth very nearly circular orbit around the sun is

Katen [24]

Answer

given,

radius of earth,r = 1.5 x 10¹¹ m

Time,T = 365 days

= 365 x 24 x 3600 s

earth velocity,

$v=\dfrac{2\pi r}{T}$

$v=\dfrac{2\pi (1.5\times 10^{11})}{365\times 24\times 3600}$

v = 3 x 10⁴ m/s

centripetal acceleration of the earth

$a = \dfrac{v^2}{r}$

$a = \dfrac{(3\times 10^4)^2}{1.5\times 10^{11}}$

a = 6 x 10⁻³ m/s²

8 0

3 years ago

TRUE OR FALSE : Boyle’s law states that, as the pressure of a gas increases, the volume decreases.

White raven [17]

True, but only if the temperature of the gas doesn't change ...
which is pretty hard to manage when you're compressing it.

I think Boyle's law actually says something like

(pressure) x (volume) / (temperature) = constant.

So you can see that if you want to say anything about two of the
quantities, you always have to stipulate that the statement is true
as long as the third one doesn't change.

6 0

3 years ago

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