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Vika [28.1K]
4 years ago
10

Write down the equation, in words, for the formation of rust.

Physics
1 answer:
Free_Kalibri [48]4 years ago
8 0

Answer:

Fe2O3

Explanation:

The chemical formula for rust is Fe2O3. Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3. Water is necessary for the oxidation reaction to occur and to facilitate transport of the electrons.

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Calculate specific heat of liquid if a 450. g iron block is heated to 98.0 C and then droped into a calorimeter with 125 g of un
Naya [18.7K]

Answer:

Specific heat of liquid 1.258 \ J/g^0C.

Explanation:

We know in thermal equilibrium :

Loss in heat by iron block = Gain in heat by liquid .

Specific heat of iron = 0.45 J/g^0C.  { source internet }

Now , loss in heat by iron block = mC_{iron}\Delta T=450\times 0.45\times 57.6=11664\ J.

Heat gain by liquid=mC_{liquid}\Delta T=450\times C_{liquid}\times 20.6=9270\times C_{liquid}.

Equating both we get :

C_{liquid}=1.258 \ J/g^0C.

7 0
3 years ago
a 10kg ball is thrown into the air. it is going 3m/s when thrown. How much potential energy will it have at the top?
Alexandra [31]

Answer:

45 J

Explanation:

Assuming the level at which the ball is thrown upwards is the ground level,

We can use the equations of motion to obtain the maximum height covered by the ball and then calculate the potential energy

u = initial velocity of the ball = 3 m/s

h = y = vertical distance covered by the ball = ?

v = final velocity of the ball at the maximum height = 0 m/s

g = acceleration due to gravity = -9.8 m/s²

v² = u² + 2ay

0 = 3² + 2(-9.8)(y)

19.6y = 9

y = (9/19.6)

y = 0.459 m

The potential energy the ball will have at the top of its motion = mgh

mgh = (10)(9.8)(0.459) = 45 J

Hope this Helps!!!

7 0
3 years ago
Why a flying areoplane has more kinectic energy than a flying insect
nikitadnepr [17]

Answer: Because the angle of attack is so high, a lot of momentum is transferred downward into the flow. These two features create a large amount of lift force as well as some additional drag.

Brainlest would be much appreciated.

6 0
3 years ago
A car driving down the road speeds up to pass bus. While passing changed velocity from 10 m/s to 35 m/s in 5 seconds. What is th
VMariaS [17]

Answer:

The ans is 3

Explanation:

First write the given values and write the formula of acceleration than do velocity - final velocity by time taken is 10-35%5 so, therefore acceleration of car is 3

5 0
3 years ago
1. The head of a rattlesnake can accelerate 50.00 m/s2 in striking a victim. If a car
scoray [572]

Answer:

2.000 s

Explanation:

Given:

a = 50.00 m/s²

v = 100.0 m/s

v₀ = 0 m/s

Find: t

v = at + v₀

(100.0 m/s) = (50.00 m/s²) t + (0 m/s)

t = 2.000 s

3 0
3 years ago
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