PHYSICS HIGH SCHOOL

Question #4 Multiple Choice Which of the following is a similarity between an industrial metrologist and a legal metrologist? Both are employed by private companies Both ensure confidence in the quality of measurements Both ensure adequate functioning of measurement instruments Both develop measurement standards based on research​

Answers

Answer 1
Answer:

Answer:

choice B

Explanation:i took the test
Answer 2
Answer:

Answer:

ITS D

Explanation:

if its wrong i will comeback and re do it

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Find the sum. Express the answer in scientific notation. (1.54 x 10^6)+(6.15 x 10^6)​

Answers

Answer:

{ \tt{(1.54 * {10}^(6)) + (6.15 * {10}^(6)) }} \n = { \tt{(1.54 + 6.15) * {10}^(6) }} \n = { \tt{7.69 * {10}^(6) }}

How much heat energy (in megajoules) is needed to convert 7 kilograms of ice at –9°C to water at 0°C?A. 2.48 MJ
B. 2.13 MJ
C. 3.26 MJ
D. 3.09 MJ

Answers

Answer;

A. 2.48 MJ

Explanation;

-Heat energy may be given by the product of specific heat capacity , mass and change in temperature, or the product of heat capacity and change in temperature.

-When a substance is changing from solid state to liquid state then the heat energy is calculate by multiplying the latent heat of fusion of a substance by the mass. Latent heat of fusion of ice =3.34×10⁵J/kg and specific heat capacity of water is 2100 J/kg/K.

Specific heat energy: Q = mcΔT

Latent heat energy: Q = mLf

In this case the heat energy required will be;

Heat required to melt ice and raise its temperature to 0°C:

Q₁ = mLf+mciΔT

Q₁ = (7 kg*3.34×10⁵J/kg) + ((7kg*2100J/kgK*{0°C-(9°C)})

= 2.48 MJ (MEGA JOULES)

1.       Energy released from changing the phase of a substance from the liquid phase to solid phase can be calculated by using the specific latent heat of fusion. The heat of fusion of water at 0 degrees Celsius is 334 J/g. Calculation are as follows:

 

 Energy = 7000 grams x 334 J/g

 Energy = 2338000 J or 2.38 MJ

A flashlight has a resistance of 2.4 what voltage is applied by the batteries if the current in the circuit is 2.5 a?

Answers

Explanation :

The resistance of the flashlight is 2.4 ohms

The current flowing in the circuit is 2.5 A

The Ohm's law gives the relation between the following quantities i.e.

Current

voltage

and resistance

Mathematically, Ohm's law can be written as :

V =I R

V=2.5\ A* 2.4\ \Omega

V=6\ Volts

The voltage applied by the batteries is 6 volts.

Hence, this is the required solution.

Answer:

D - 6.0

Explanation:

i'm not getting more detailed than the other answer so yeah i just took the test

What is the temperature change when 69.0kJ is transferred to a 1.20kg object with a specific heat capacity of 250J/(kg ∘ C)?

Answers