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2 years ago

احسبي محصلة أزاحة طالب يتحرك مسافة 40m شمالا ثم يتحرك 20m جنوبا ما محصلة ازاحته وفي اي اتجاه ؟

Physics

2 answers:

Phantasy [73]2 years ago

6 0

Answer:

احسبي محصلة أزاحة طالب يتحرك مسافة 40m شمالا ثم يتحرك 20m جنوبا ما محصلة ازاحته وفي اي اتجاه ؟

Serggg [28]2 years ago

4 0

No idea sorry for that

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If you were to mix 7 grams of sugar into 100 grams of water, how much should the total mass of the solution be?

inn [45]

Answer:

The total mass of the solution should be 107 grams

Explanation:

Solutions

A solution is a homogeneous mixture consisting of a solute dissolved into a solvent. The solute is the substance that is being dissolved, while the solvent is the dissolving medium.

The relationship between the masses is:

$m_s=m_o+m_v$

Where:

ms = mass of the solution

mo = mass of the solute

mv = mass of the solvent

If you were to mix mo=7 gr of sugar into mv=100 gr of water, then the total mass of the solution should be:

$m_s=7~gr+100~gr$

$m_s=107~gr$

The total mass of the solution should be 107 grams

8 0

2 years ago

As you rise upwards in the atmosphere air pressure___

Oduvanchick [21]

Answer:

Gases - Water vapor, Nitrogen, Oxygen etc. Describe what happens to air pressure as you rise upwards in the atmosphere. What causes this change in air pressure? As altitude increases, air pressure will decrease As altitude increases the gas molecules that make up the air spread further apart

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2 years ago

a 800 kg roller coaster cart is accelerated by a constant net force over a distance of 10 meters, as shown in the graph below: d

devlian [24]

Answer:

vf = 22.36[m/s]

Explanation:

First we must understand the data given in the problem:

m = mass = 800 [kg]

F = force = 20000[N]

dx = displacement = 10[m]

From newton's second we know that the sum of forces must be equal to the product of mass by acceleration.

$F = m*a\\20000 = 800*a\\a = 20000/800\\a = 25 [m/s^2]$

With the calculated acceleration, we can use the kinematics equations.

$v_{f} ^{2} =v_{o} ^{2}+2*a*dx\\ v_{o} = initial velocity = 0\\a = acceleration = 25[m/s^2]\\dx= displacement = 10[m]\\$

The key to using this equation is to clarify that the initial velocity is zero since the body is at rest, otherwise the initial velocity would be an initial data.

$v_{f} =\sqrt{2*25*10} \\v_{f} =22.36[m/s]$

Another way of solving this problem is by means of the definition of work and kinetic energy, where work is defined as the product of the force by the distance.

W =F*d

W = 20000*10

W = 200000[J]

Kinetic energy is equal to work, therefore the value calculated above is equal to:

$E_{k}=W =0.5*m*v_{f}^{2} \\200000=0.5*800*v_{f}^{2}\\v_{f}=\sqrt{\frac{200000}{0.5*800} } \\v_{f}=22.36[m/s]$