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3 years ago

3.25 kcal is the same amount of energy as

Physics

2 answers:

PIT_PIT [208]3 years ago

8 0

Phantasy [73]3 years ago

5 0

Answer:

$E = 13.6 kJ$

Explanation:

As we know that

1 cal = 4.18 J

$1 kcal = 10^3 cal$

so we have

$1 kcal = 10^3 \times 4.18 J$

now we have total energy in k cal unit given as

$E = 3.25 kcal$

$E = 3.25 \times 4.18 \times 10^3$

$E = 13585 J$

$E = 13.6 kJ$

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An oil film with refractive index 1.48 and thickness 290 nm is floating on water and illuminated with white light at normal inci

VikaD [51]

Answer:

572.3 nm

Explanation:

$n_{oil}$ = refractive index of the oil film = 1.48

$t_{oil}$ = thickness of the oil film = 290 nm

$\lambda$ = wavelength of the dominant color

m = order

Using the equation

$2 n_{oil} t_{oil} = (m + 0.5) \lambda$

For m = 0

$2 (1.48) (290) = (0 + 0.5) \lambda$

$\lambda$ = 1716.8 nm

For m = 1

$2 (1.48) (290) = (1 + 0.5) \lambda$

$\lambda$ = 572.3 nm

For m = 2

$2 (1.48) (290) = (2 + 0.5) \lambda$

$\lambda$ = 343.4 nm

Hence the dominant color wavelength is 572.3 nm

8 0

3 years ago

Technician A says that the freezing point of a substance is the temperature at which the substance changes state from a solid to

pashok25 [27]

Answer:

Technician B is correct

Explanation:

Freezing is a method of conversion of substance in its liquid state to solid state. It is the process by which a liquid substance changes to a solid at a particular temperature.

Increasing the pressure and decreasing the temperature of a liquid increases its freezing point. For example, in other to freeze water i.e to change water to ice, it has to be kept in a fridge at a temperature lower than the temperature of the water. The essence of covering the fridge after placing the water in the fridge is to increase the pressure of the liquid hence increasing its freezing rate.

Based on the above explanation, it can be concluded that technician B is correct.

5 0

3 years ago

The current in the wires of a circuit is 180.0 milliamps. If the resistance of the circuit were doubled ( with no change in volt

Troyanec [42]

Answer:

I = 0.09[amp] or 90 [milliamps]

Explanation:

To solve this problem we must use ohm's law, which tells us that the voltage is equal to the product of the voltage by the current.

V = I*R

where:

V = voltage [V]

I = current [amp]

R = resistance [ohm]

Now, we replace the values of the first current into the equation

V = 180*10^-3 * R

V = 0.18*R (1)

Then we have that the resistance is doubled so we have this new equation:

V = I*(2R) (2)

The voltage remains constant therefore 1 and 2 are equals and we can obtain the current value.

V = V

0.18*R = I*2*R

I = 0.09[amp] or 90 [milliamps]

7 0

3 years ago

Suppose a runner completes one lap around a 400-m track in a time of 50 s. Calculate the average speed of the runner.

suter [353]

Answer:

8m/s

Explanation:

Average Speed = distance / time = 400/50 = 8m/s

6 0

3 years ago

What does a wave do that is so important?

expeople1 [14]

Waves transmit energy without transmitting matter, This means that we can move energy or information from one place to another without moving any substance from one place to another.

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3 years ago

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