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VladimirAG [237]
3 years ago
15

If multiple measurements are taken and they vary quite a bit from each other, the measurements are

Physics
2 answers:
Alexus [3.1K]3 years ago
8 0

Answer:

precise

Explanation:

usatestprep

Sphinxa [80]3 years ago
7 0

Answer

B) not precise

Explanation:

i just did it from USATsetprep

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A 4.0 kg model rocket is launched, shooting 50.0 g of burned fuel from its exhaust at an average velocity of 625 m/s. What is th
Scorpion4ik [409]

Answer:

Velocity of rocket will be equal to 7.81 m/sec

Explanation:

We have given mass of the rocket m_1=4kg

Mass of fuel is given m_2=50gram=0.05kg ( As 1 kg is equal to 1000 gram )

Velocity of fuel v_2 = 625 m/sec

We have to find the velocity of rocket v_1

From conservation of momentum we know that initial momentum is equal to final momentum '

So m_1v_1=m_2v_2, here m_1 is mass of rocket v_1 is velocity of rocket m_2 is mass of fuel and v_2 is velocity of fuel

So 4\times v_1=625\times 0.05

v_1=7.81m/sec

So velocity of rocket will be equal to 7.81 m/sec

8 0
3 years ago
PLEASE HELP WITH THIS QUESTION<br><br>What of Newton's 3 laws is this picture​
Reptile [31]

Answer:

Hey

Newtons 1rst law (the penny isint moving, it will remain that way)

7 0
3 years ago
How much energy must be transferred out of the system as heat q to lower its temperature to 0∘c? express your answer numerically
serg [7]

Answer:

Incomplete question:

Refer to the temperature versus time graph when answering the questions in Parts C through F. A system consists of 250 of water. The system, originally at = 21.0 , is placed in a freezer, where energy is removed from it in the form of heat at a constant rate. The figure shows how the temperature of the system takes to drop to, after which the water freezes. Once the freezing is complete, the temperature of the resulting ice continues to drop, reaching temperature after an hour. The following specific heat and latent heat values for water may be helpful.

specific heat of ice (at ) = 2.10 J/g K

latent heat of fusion (ice to water phase change at ) = 333.7 J/g

specific heat of water (at ) = 4.186 J/g K

latent heat of vaporization (water to steam phase change at ) = 2256 J/g

specific heat of steam (at ) = 2.01 J/g K

Answers:

Qtotal = 237775 J

Explanation:

To solve this exercise it is necessary to know that if the system is a single phase in which there is a temperature change or if it is a phase change at a single temperature. In the first case, the following formula would be used to calculate the amount of heat:

Q₁ = mCpΔT

Here

m is the mass = 250 g

Cp is the specific heat of ice = 2.1 J/g K

ΔT = 21 - 0 = 21°C = 294 K

In this case the amount of energy is

Q₁ = 250*2.1*294 = 154350 J

In the second case, where there is a phase change at a single temperature, the amount of heat is:

Q₂ = mLf

Here

Lf = latent heat of fusion (ice to water phase change) = 333.7 J/g

Substituting:

Q₂ = 250*333.7 = 83425 J

The total heat is:

Qtotal = 154350+83425=237775 J

7 0
3 years ago
This is a group of elements with few valence electrons that conducts heat and electricity.
k0ka [10]

Answer:

Metals

Explanation:

The group of elements with few valence electrons that conducts heat and electricity is known metals. Metals are good conductors of heat and electricity. The outer electrons in metals are loosely bound to the atom and are thus able to freely move around and conduct electricity and heat.

5 0
3 years ago
Identify one harmful environmental change that occurs when a volcano erupts.
klasskru [66]
Many ecosystems and plants are damaged or destroyed when a volcano erupts.
5 0
3 years ago
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