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3 years ago

Question 11.A mercury-in-glass thermometer registèrs a change in temperature because of

Physics

1 answer:

Leni [432]3 years ago

8 0

The thermometer registers a change in temperature because the volume of mercury changes when it gets hotter (expands) and colder (retracts).

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Prove and state law of conservation of energy

Novay_Z [31]

Explanation:

Law of conservation of energy states that the energy of a system is always constant. 

In other words, we can say that energy can neither be created nor destroyed.

Mechanical energy (E) is the sum of the potential energy (U) and the kinetic energy (K) of the freely falling body. Therefore, E=K+U=constant.

5 0

3 years ago

Boltzmann’s constant is 1.38066×10−23 J/K, and the universal gas constant is 8.31451 J/K · mol. If 1.9 mol of a gas is confined

Crazy boy [7]

Answer:

The average kinetic energy of a gas molecule is 8.49 × 10⁻²¹ J

Explanation:

According to Kinetic Molecular Theory, the average kinetic energy of gas molecules is a function only of temperature and is given by the equation:

$E=\frac{3}{2}kT$

$pV=nRT;\\T=\frac{pV}{nR}$

Substituting the value of T in the kinetic energy equation:

$E=\frac{3kpV}{2nR}$

Where p is the pressure of the gas = 9 atm = 9 × 101325 pa

k is the Boltzmann’s constant = 1.38066 × 10⁻²³ J/K,

V is the volume of the gas = 7.1 L = 7.1 × 10⁻³ m³

n is the number of moles of the gas = 1.9 mol

R is the universal gas constant = 8.31451 J/K · mol.

E is the average kinetic energy of a gas molecule

Substituting values:

$E=\frac{3kpV}{2nR}=\frac{3*1.38066*10^{-23}*9*101325*7.1*10^{-3}}{2*1.9*8.31451}=8.49*10^{-21}J$

The average kinetic energy of a gas molecule is 8.49 × 10⁻²¹ J

6 0

3 years ago

A mud blob, 0.350 kg, is thrown at a wall at 10 m/s. The blob sticks to the wall. What is the change in momentum of the blob?

Sati [7]

P=mv
(.350)(10)
=3.5kgms

3 0

3 years ago

A 40-gram block of copper at 95*C is placed in 105 g of water at an unknown temperature. After equilibrium is reached, the final

REY [17]

Answer:

Attention all people! There is a girl trying to get people to press this link and she tries to control your computer and steal your information that is on the computer! SHE WILL CAUSE A VIRUS!!!!! DO NOT PRESS ANY LINKS!!!!!!!!!

Explanation:

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3 years ago

A satellite, moving in an elliptical orbit, is 360 km above earth's surface at its farthest point and 180 km above at its closes

andreev551 [17]

Take the radius of the Earth 6 370 km.Then:
The semimajor axis:a = 6 370 + 360 = 6 730 km
Semiminor axis:b = 6 370 + 180 = 6 550 km
Eccentricity:ε = √ (a2+b2) / a = √ (6 7302+65502) / 6 730 ≈ 1.4

7 0

3 years ago