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3 years ago

Which of the following statement is not true about machines?

Physics

2 answers:

viva [34]3 years ago

4 0

The answer to this question is D or the last one

tester [92]3 years ago

4 0

The machine can affect the productivity in various ways.

The work done by a substance is is product of force and displacement.

Mathematically Work done W = FS where F is the force and S is the distance travelled.

The most significantly machine changes the direction of force which is required to carry out the required work.By doing so, the machines can lessen or increase the force needed for the work.We may say that the machines change the size of the force.

A machine can affect the work done by changing the way in which the work is done.The vice versa is not true.The machine can not decrease the amount of work that is done

Hence the correct option will be the last one i.e machines decrease the amount of work that is done.

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Answer:

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3 years ago

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What mass of ice (in g) can be melted if 27.2 kJ of thermal energy are added at the freezing point? Use molar mass = 18.02 g/mol

san4es73 [151]

Answer : The mass of ice melted can be, 3.98 grams.

Explanation :

First we have to calculate the moles of ice.

$Q=\frac{\Delta H}{n}$

where,

Q = energy absorbed = 27.2 kJ

$\Delta H$ = enthalpy of fusion of ice = 6.01 kJ/mol

n = moles = ?

Now put all the given values in the above expression, we get:

$27.2kJ=\frac{6.01kJ/mol}{n}$

$n=0.221mol$

Now we have to calculate the mass of ice.

$\text{Mass of ice}=\text{Moles of ice}\times \text{Molar mass of ice}$

Molar mass of ice = 18.02 g/mol

$\text{Mass of ice}=0.221mol\times 18.02g/mol=3.98g$

Thus, the mass of ice melted can be, 3.98 grams.

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4 years ago

Why does immersion oil improve resolution?

Umnica [9.8K]

Answer:

d. It increases numerical aperture and maintains a uniform light speed.

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Answer:

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anzhelika [568]

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