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4 years ago

7

What happens when a substance undergoes a physical change?

2 answers:

Andreyy894 years ago

4 0

It visually changes but keeps it's properties like ice to water to steam.

zaharov [31]4 years ago

4 0

Answer:

Its form is affected

Explanation:

A physical change implies only a modification in the physical properties of a substance. Contrary to this in a chemical change not only its form but its composition changes.

Processes like melting, transition to a gas, change of strength, textural change, shape, size, color, volume, and density, are examples of physical changes.

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The Burj Khalifa is the tallest building in the world at 828 m. How much work would a man with a weight of 700 N do if he climbe

8090 [49]

Answer:

579600J

Explanation:

Given parameters:

Height of the building = 828m

Weight of the man = 700N

Unknown:

Work done by the man = ?

Solution:

The work done by the man is the same as the potential energy expended.

Work done:

Work done = Weight x height = 700 x 828

Work done = 579600J

7 0

3 years ago

A man of mass 80.0 kg stands on a platform of mass 40.0 kg. He pulls on a rope that is fastened to the platform and runs over a

Vesnalui [34]

Answer:F=648 N

Explanation:

Given

mass of man $m_1=80 kg$

mass of Platform $m_2=40 kg$

acceleration of system $a=1 m/s^2$

Let F be the force with which man pulls the rope which will also create a tension of F in rope

From Diagram

$2F-(m_1+m_2)g=(m_1+m_2)a$

$2F=(m_1+m_2)(g+a)$

$F=\frac{(m_1+m_2)(g+a)}{2}$

$F=\frac{(80+40)(9.8+1)}{2}$

$F=\frac{1296}{2}$

$F=648 N$

7 0

4 years ago

A film of oil on water will appear dark when it is very thin, because the path length difference becomes small compared with the

VMariaS [17]

Answer:

jhgyhhtuifghhjfgy

Explanation:

jjhuyddfrgzzdssfdffsd fdfdfsdfddsfsdfsd

6 0

3 years ago

In an RC-circuit, a resistance of R=1.0 "Giga Ohms" is connected to an air-filled circular-parallel-plate capacitor of diameter

solniwko [45]

Answer:

$\tau = 1\ ms$

Explanation:

First we need to find the capacitance of the capacitor.

The capacitance is given by:

$C = \epsilon_0 * area / distance$

Where $\epsilon_0$ is the air permittivity, which is approximately 8.85 * 10^(-12)

The radius is 12/2 = 6 mm = 0.006 m, so the area of the capacitor is:

$Area = \pi * radius^{2}\\Area = \pi * 0.006^2\\Area = 113.1 * 10^{-6}\ m^2$

So the capacitance is:

$C = \frac{8.85 * 10^{-12} * 113.1 * 10^{-6}}{0.001}$

$C = 10^{-12}\ F = 1\ pF$

The time constant of a rc-circuit is given by:

$\tau = RC$

So we have that:

$\tau = 10^{9} * 10^{-12} = 10^{-3}\ s = 1\ ms$

7 0

3 years ago

A box weighs 65.9 N on Earth. What is is the mass?

erastovalidia [21]

Answer:

6.59Kg

Explanation:

1kg = 10N

? = 65.9N

65.9N ÷ 10N * 1kg = 6.59Kg

5 0

3 years ago