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3 years ago

Plz do all of it i will give brainlest and thanks to best answer plz do it right

Physics

1 answer:

Sladkaya [172]3 years ago

8 0

Answer: The answer is B: Convection

Explanation: Convection transfers heat through a movement of fluids but in this case its through air hope this helps :)

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a/ Compute the quantity of heat released by 25.0 g of steam initially at 100.0oC, when it is cooled to 34.0°C and by 25.0 g of w

Svetach [21]

Answer:

When put into steam

Explanation:

When a certain amount of steam at boiling temperature condenses (turning into water), the amount of heat released is

$Q_1 = m\lambda_v$

where in this case

m = 25.0 g = 0.025 kg is the mass of steam at 100.0°C

$\lambda_v=2.256\cdot 10^6 J/kg$ is the latent heat of vaporization of water

So,

$Q_1=(0.025)(2.256\cdot 10^6)=56400 J$

Instead, the amount of heat released when the water at 100.0°C is cooled down to 34.0°C is given by

$Q_2=mC\Delta T$

where

m = 25.0 g = 0.025 kg is the mass of water

$C=4.19\cdot 10^4 J/kg K$ is the specific heat of water

$\Delta T=100-34=66^{\circ}C$ is the change in temperature

Therefore,

$Q_2=(0.025)(4.19\cdot 10^3)(66)=6913 J$

Since $Q_1>Q_2$ , we can say that your hand will burn more in the first case.

5 0

3 years ago

Why cant body builders swim please give reasons.

Ronch [10]

The main reason is becouse these people are over 200 pounds and no mater how strong you are arms arnt ment to keep you up thanks.

8 0

3 years ago

Read 2 more answers

A 1400 kg car driving at 25 m/s slams on its brakes. The coefficient of kinetic friction between the tires and the road is 0.7.

tamaranim1 [39]

The acceleration of the car is 6.86 m/s² and the time taken for the car to stop is 3.64 s.

The given parameters;

mass of the car, m = 1400 kg
Initial velocity of the car, u = 25 m/s
coefficient of kinetic friction, μ = 0.7

The acceleration of the car is calculated as follows;

a = μg

a = 0.7 x 9.8

a = 6.86 m/s²

The time taken for the car to stop is calculated by using Newton's second law of motion;

F = ma

$F = \frac{mv}{t} \\\\ma = \frac{mv}{t}\\\\a = \frac{v}{t} \\\\t = \frac{v}{a} \\\\t = \frac{25}{6.86} \\\\t = 3.64 \ s$

Thus, the acceleration of the car is 6.86 m/s² and the time taken for the car to stop is 3.64 s.

Learn more here:brainly.com/question/19887955

5 0

3 years ago

A team of engineers is working together to design a new airplane. The team members each live in different cities. For which purp

Ierofanga [76]

Answer:

The internet is most useful to them because they use it to communicate.

Explanation:

If I were to send a message to my brother in Florida, through the internet, while I'm in Pennsylvania he would get it in minutes. On the other hand if I were going to meet him and then explain what I wanted to tell him in person it would take a much longer time.

8 0

3 years ago

A 14.0 g wad of sticky clay is hurled horizontally at a 110 g wooden block initially at rest on a horizontal surface. The clay s

ahrayia [7]

Answer:

86.53 m/s

Explanation:

Given:

Mass of clay (m) = 14.0 g = 0.014 kg

Mass of block (M) = 110 g = 0.110 kg

Initial speed of block (U) = 0 m/s

Sliding distance (d) = 7.50 m