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2 years ago

1- what is a machine?

1 answer:

3 0

1) A machine is an apparatus using or applying mechanical power and having several parts, each with a specific function.

2) Energy is the capacity of a physical system to do work.

3) Fuels are any material that can be made to react with other substances so that it releases energy as heat energy or to be used for work.

4) Measure a volume of an acid and place into a polystyrene cup which is placed into a beaker.
Measure the temperature of the acid with a thermometer.
Add a measured volume of an alkali to the acid.
Measure the temperature rise to calculate the energy change.

5) the ratio of the useful work performed by a machine or in a process to the total energy expended or heat taken in; an action designed to achieve efficiency.

6) Pulley, lever, screw, and inclined plane.

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How is velocity ratio of wheel and axle calculatedaad

iogann1982 [59]

Answer:

VR = $\frac{Radius of wheel}{Radius of axle}$

Explanation:

A machine is a device that can be used to overcome a load by the application of an effort through a pivot. Examples are: pulleys, wedge, screw jack, wheel and axle etc.

The wheel and axle is a simple device that can be used to lift a load through a height. Its velocity ratio (VR) can be determined by:

VR = $\frac{Radius of wheel}{Radius of axle}$

Note that for a practical wheel and axle, the radius of the wheel is greater than the radius of the axle.

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2 years ago

If oxygen and steel wool are combined is it a physical change or chemical change?

Anon25 [30]

Answer:

I think it would be a chemical change.

Explanation:

Because a physical would be like crushing it or something along that line.

4 0

3 years ago

Read 2 more answers

Since the Wagon is being pulled down hill is it increasing (C)

Ket [755]

Since the wagon is being pulled down hill with a constant velocity, all the forces of the wagon would be (C) increasing.
You are correct! **

4 0

3 years ago

Some element can be either solid or liquid. At the melting point, the liquid has 8 × 10-22 J more enthalpy per atom than the sol

OlgaM077 [116]

Answer:

481.76 J/mol

133.33 K

Explanation:

$N_A$ = Avogadro's number = $6.022\times 10^{23}$

Change in enthalpy is given by

$\Delta H=8\times 10^{-22}\times 6.022\times 10^{23}\\\Rightarrow \Delta H=481.76\ J/mol$

Entropy is given by

$\Delta S=6\times 10^{-24}\times 6.022\times 10^{23}\\\Rightarrow \Delta S=3.6132\ J/mol K$

Latent heat of fusion is given by

$L_f=\Delta H\\\Rightarrow L_f=481.76\ J/mol$

The latent heat of fusion is 481.76 J/mol

Melting point is given by

$T_m=\dfrac{L_f}{\Delta S}\\\Rightarrow T_m=\dfrac{8\times 10^{-22}\times 6.022\times 10^{23}}{6\times 10^{-24}\times 6.022\times 10^{23}}\\\Rightarrow T_f=133.33\ K$

Melting occurs at 133.33 K

3 0

2 years ago

If an atom has 3 protons, 3 neutrons, and 2 electrons, what is the electrical charge of the atom?

My name is Ann [436]

+1
+3 protons -2 electrons = +1

7 0

3 years ago

Read 2 more answers