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2 years ago

Earth's core is composed primarily of _____. -iron oxides and magnesium -silicon and iron -iron and nickel -magnesium and nickel

Physics

1 answer:

Shalnov [3]2 years ago

3 0

Iron & Nickel. There are also small doses of other unimportant garbage.

C is your answer. (Iron & Nickel)

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A bucket of water of mass 10 kg is pulled at constant velocity up to a platform 30 meters above the ground. This takes 10 minute

Rudik [331]

Answer:

W = 2352 J

Explanation:

Given that:

mass of the bucket, M = 10 kg

velocity of pulling the bucket, v = 3 $m.min^{-1}$

height of the platform, h = 30 m

time taken, t = 10 min

rate of loss of water-mass, m = $0.4 kg.min^{-1}$

Here, according to the given situation the bucket moves at the rate,

$v=3 m.min^{-1}$

The mass varies with the time as,

$M=(10-0.4t) kg$

Consider the time interval between t and t + ∆t. During this time the bucket moves a distance

∆x = 3∆t meters

So, during this interval change in work done,

∆W = m.g∆x

For work calculation:

$W=\int_{0}^{10} [(10-0.4t).g\times 3] dt$

$W= 3\times 9.8\times [10t-\frac{0.4t^{2}}{2}]^{10}_{0}$

$W= 2352 J$

5 0

2 years ago

What is amplitude, wavelength, and frequency?

krek1111 [17]

Wavelength- distance between successive crests of a wave.

frequency- the rate at which something occurs or is repeated over time.

amplitude- maximum extent of a vibration.

6 0

3 years ago

Identify trends in physical properties based on intermolecular forces

umka21 [38]

The Boiling point,melting point, surface tension and viscousity will increase while the Vapor pressure will decrease.

<h3 /><h3>What are intermolecular forces?</h3>

Intermolecular forces are the forces that bind two molecules together. Physical properties are affected by the strength of intermolecular forces

An increase in the strength of intermolecular forces increases will lead to an increase in force applied to break the barriers posed by the strength of the molecules.

This increased intermolecular strength will cause a rise in boiling point,melting point, viscousity and surface tension.

The Vapor pressure reduces with increasing intermolecular strength. Vapor pressure is the amount of vapor that is equilibrium with its own liquid or solid. Hence,with increasing intermolecular strength the amount of vapor that is in equilibrium with its own liquid will reduce.

To know more about intermolecular forces follow

brainly.com/question/13588164

#SPJ4

6 0

1 year ago

Electronic flash units for cameras contain a capacitor for storing the energy used to produce the flash. In one such unit, the f

gladu [14]

Answer:

A) energy to be stored = 354.4J

B) capacitance = 0.0454 farad

Explanation:

Detailed explanation and calculation is shown in the image below

8 0

2 years ago

What is the most effective stress management strategy?

Kitty [74]

Answer:

Physical activities play an important role in manage our stress levels.

Explanation:

In our daily life we face many stressful experiences such as job, studies, a chronic disease etc., the brain send warnings to the muscles and to the adrenal glands which releases adrenaline and cortisol. Stress leads to high blood pleasure and there are many strategies to manage our stress, keeping our mind in a positive attitude helps to reduce stress levels. Doing physical activities keep our mind away from stress. Yoga, Meditation, Deep breathing exercises, Aerobics keeps our mind free from stress.

5 0

3 years ago