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3 years ago

The word atom comes from a Greek word that means “able to duplicate”.

1 answer:

3 0

The statement, The word atom comes from a Greek word that means “able to duplicate”, is false. The greek word for atom is atomos. The a- in atom means “not” and –tom means “cut”. So it is not ot cut or it cannot be cut. It is common definition is indivisibility. This definition is defined by the philosopher Democritus. He observed that as he cut the sugar cube into smaller fraction, it reduces to nothing that cannot be seen in the eye. And so he proposed that definition.

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If temperature and the number of particles remain constant, and increase in pressure will cause volume to

omeli [17]

The correct answer is remain the same because if the particles and temperature remain constant, when the pressure increases the temperature is not increasing so it would just stay the same

5 0

3 years ago

Calculate the following forces for a box with a mass=20.0 kg sitting on an incline of 29.0 degrees and a coefficient of friction

Anna007 [38]

Vertical force on the box=mg
the component of gravity parallel=mg*SinTheta 
the component of gravity normal=mg*CosTheta 
frictional force up the plane: mg*cosTheta*mu max, but if it is sitting still, it is equal and opposite to mg*cosTheta (it cannot be greater than this or it would go up the plane).

3 0

3 years ago

Uphill escape ramps are sometimes provided to the side of steep downhill highways for trucks with overheated brakes. For a simpl

o-na [289]

Answer:

404.4 m

Explanation:

Converting the initial speed from km/h to m/s then

$140\times \frac {1000m}{3600s}=38.88888889 m/s \approx 38.89 m/s$

The acceleration is resolved as shown in the figure hence

deceleration of the truck along the inclined plane will be

$a=-g sin \theta$ where g is acceleration due to gravity

Substituting g with $9.81 m/s^{2}$ then

$a=-9.81 m/s^{2} sin 11^{\circ}=-1.871836245\approx -1.87 m/s^{2}$

Using kinematic equation

$v^{2}=u^{2}+2as$ and making s the subject then

$s=\frac {v^{2}-u^{2}}{2a}$ where v and u are final and initial velocities respectively

Substituting 0 for v, 38.89 m/s for u and $-1.87 m/s^{2}$ then

$s=\frac {0^{2}-38.89^{2}}{2\times -1.87}=404.3936096 m\approx 404.4 m$

3 0

3 years ago

A transformer steps up an alternating current from

Deffense [45]

Answer:

See the answers below.

Explanation:

A transformer is a static electrical machine, it should be borne in mind that although the voltage can be increased or decreased, the power must always be equal.

For this case:

The power in the first coil can be calculated by means of the following formula.

$P=V*I\\$

where:

V = voltage = 12 [V]

I = current =2 [A]

Therefore the power:

$P=12*2\\P=24[W]$

Now in the second coil, the power must be the same:

$P_{secondcoil}=V*I\\24=144*I_{secondcoil}\\I_{secondcoil}=24/144\\I_{secondcoil}=0.166[A]$

4 0

3 years ago

Is it possible for two objects to have different speeds but the same kinetic energy?(1 point)

trapecia [35]

Answer:

No.There are no combinations of different masses and speeds that would give the same kinetic energy.

Explanation:

different masses can have the same kinetic energy .

HOPE THIS HELPS

8 0

2 years ago