How do I compute the resistance in ohms of a lead block 15 cm long and 0.10 cm2 in cross-sectional area. (ρ = 2.2 x 10-5 ohm-cm)

Answers

Answer 1

Answer: Resistance is also dependent on the length of a wire where it is expressed as the product of the resistive force and the length of the wire over the cross-sectional area of the wire. Calculation are as follows:

R= pL / A
R = 2.2 x 10^-5 x 15 / 0.10
R = 3.3 x 10^-3 ohms

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How much energy ( in joules ) is released when 0.06 kilograms of mercury is condensed to a liquid at the same temperature ? A. 697.08 J
B. 17,705.1 J
C. 20,075.04 J
D. 51,302.88 J

Please include how you got your answer , thank you.

Answers

Answer:

B. 17,705.1 J

Explanation:

The hear released when the mercury condenses into a liquid is given by:

$Q=m \lambda_v$

where

m = 0.06 kg is the mass of the mercury

$\lambda_v$ is the latent heat of vaporization

For mercury, the latent heat of vaporization is $\lambda_v = 296 kJ/kg$ , so the heat released during the process is:

$Q=(0.06 kg)(296 kJ/kg)=17.76 kJ = 17,760 J$

So, the closest option is

B. 17,705.1 J

The energy ( in joules ) released when 0.06 kilograms ofmercury is condensed to a liquid at the same temperature is about 697.08 J. inother to solve this problem, should know the latent heat of fusion of mercurywhich is equal to about 11.4 kJ/kg and multiplying by mass of mercury.

During a phase change what happens to the temperature?

Answers

During a phase change the substance or objects temperature increases or decreases depending on which way they go, Solid to liquid to gas needs added heat which makes it an endothermic reaction. Gas to liquid to solid loses heat energy to slow down its particles this is an exothermic reaction.

The temperature either rises or falls during a state change.
Ex.
Melting from ice to water~ the temperature is rising.

OR

Ex.
From a gas to a liquid~ the temperature is falling.

What is the result of a force distributed over an area?a. pressure
b. mass
c. temperature
d. volume

Answers

Pressure is the result of a force distributed over an area.

The charges on two metallic balls are 5.0 and 7.0 coulombs respectively. They are kept 1.2 meters apart. What is the force of interaction between the two?

Answers

Answer: the correct answer is 8*10^-11

Sound waves are produced by the horn of a truckthat is approaching a stationary observer.
Compared to the sound waves detected by the
driver of the truck, the sound waves detected by
the observer have a greater
(1) wavelength (3) period
(2) frequency (4) speed

Answers

Compared to the sound waves detected by the driver of the truck, the sound waves detected by the observer have a greater "(2) frequency" and will be more high pitched.

Answer: The correct option is (2).

Explanation:

Doppler effect is the phenomenon in which the frequency of the wave increase or decrease when there is relative motion between the source and the listener. There is an apparent change in the frequency.

When the source and the listener are approaching each other then there will be increase in the frequency.

When the source and the listener are moving away form each other then there will be decrease in the frequency.

In the given problem, Sound waves are produced by the horn of a truck

that is approaching a stationary observer. The sound waves detected by the observer have greater frequency.

Therefore, the correct option is (2).

A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside?

Answers

   Potential energy = (mass) x (gravity) x (height)

   1,568 J = (40 kg) x (9.8 m/s²) x (height)

Divide each side
by 392 Newtons:    Height = (1,568 N-m) / 392 N

= 4 meters .

Answer:

B) 4.0m

Explanation:

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