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3 years ago

How does a pulley make work easier?

2 answers:

8 0

Pulleys are powerful simple machines.they can change the direction of a force which can make it much easier for us to make something.

Example:
If we want to lift something that weights 10 kilograms one meter high we can lift it straight up or we can use a pulley se we can pull down on one end to lift the object up

emmasim [6.3K]3 years ago

7 0

it helps use less weight to pick up things and makes it way easier to work

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How can briquette support to save fossil fuel?

Marina86 [1]

Answer:

use a reusable source of energy such as hydro power

Explanation:

use renewable energy it saves the environment and does not create global warming

6 0

2 years ago

Which explanation best describes a wave?

maw [93]

Is the energy contained in the particles of a medium

5 0

3 years ago

Superman throws a 2400 n boulder at an adversary. what horizontal force must superman apply to the boulder to give it a horizont

balu736 [363]

The horizontal force Superman must apply to throw the boulder is 3670N.

According to Newton's Second law of motion,

Force F = Mass m * Acceleration a

We know that Weight W = Mass m * Gravity g

Given,

Weight W = 2400 N

Acceleration a = 15 m/ $s^{2}$

Gravitational force g = 9.81 m/ $s^{2}$

W = m * g

Mass m = 2400 / 9.81 = 244.65 kg

Horizontal force F = 244.65 * 15 = 3669.7 N

Newton's Second law of motion states that acceleration of an object depends on force acting on the object and mass of the object.

Therefore the horizontal force Superman must apply to throw the boulder is 3670N.

To know more about horizontal force

brainly.com/question/2037071

#SPJ4

4 0

2 years ago

Approximately how far is the sun from the center of the galaxy?

Stells [14]

Answer:

About 8 kpc

Explanation:

The milky way galaxy is the galaxy we live in. Its composed of the solar system, billion stars, gas, dust and dark matter.

At its center it contains a super massive black hole called Sagittarius. This object is millions of times as massive as the sun.

The sun is about 8 kpc to the center of the milky way galaxy, this is about 26,000 light years away.

1000 parsecs distance is approximately 3262 light years.

A light year is the distance light can travel in a period of 1 year.

6 0

3 years ago

The Goodyear blimp Spirit of Akron is 62.6m long and contains 7023m^3 of helium. When the temperature of the helium is 285 K, it

andre [41]

Answer:

1328.7032 kg

Explanation:

P = Pressure = 112 kPa

T = Temperature = 285 K

V = Volume = 7023 m³

R = Gas constant = 8.314 J/mol K

From the ideal gas law we have

$PV=nRT\\\Rightarrow n=\dfrac{PV}{RT}\\\Rightarrow n=\dfrac{112000\times 7023}{8.314\times 285}\\\Rightarrow n=331960.04203\ moles$

The mass of gas is given by

$m=n\times MW_{He}\\\Rightarrow m=331960.04203\times 4.0026\times 10^{-3}\\\Rightarrow m=1328.70326\ kg$

The mass of helium in the blimp is 1328.7032 kg

8 0

3 years ago