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rusak2 [61]
3 years ago
12

True or false. a short circuit cannot cause a fire​

Chemistry
2 answers:
fredd [130]3 years ago
6 0

Answer:

false

Explanation:

RoseWind [281]3 years ago
4 0

Answer:

<h3>False</h3>

Explanation:

A short circuit can cause a spark or fire.

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How much work must be done on a 5-kg snowboard to increase its speed from 2 m/s to 4 m/s?
Alekssandra [29.7K]

Answer:

Option C = 30 j

Explanation:

Given data:

mass of snowboard = 5 Kg

Initial speed = 2 m/s

final speed = 4 m/s

work done = ΔE= ?

ΔE= change in kinetic energy

Solution:

Formula:

K.E (initial) = 1/2 × mv²

K.E (initial)  = 1/2 × 5 Kg . (2m/s)²

K.E (initial) = 1/2 × 20 Kg.m²/s²

K.E (initial) = 10 Kg.m²/s² or 10 J      

   Kg.m²/s² = J

K.E (finial) = 1/2 × mv²

K.E (finial) = 1/2 ×  5 Kg . (4m/s)²

K.E (finial) = 1/2 ×  5 Kg . 16 m²/s²

K.E (finial) = 1/2 × 80 Kg.m²/s²

K.E (finial) = 40 Kg.m²/s²  or 40 J

work done =  ΔE = K.E (finial) - K.E (initial)

work done =  ΔE = 40 J - 10 J

work done =  ΔE = 30 J

6 0
3 years ago
Convert 5 micrometers to meters.
k0ka [10]

Answer:

5e-6

Explanation:

7 0
3 years ago
Read 2 more answers
Why does a higher concentration make a reaction faster?
iris [78.8K]

Answer:

Explanation: because more is always better

5 0
3 years ago
Which equation represents a double replacement reaction?
AveGali [126]

Answer:

C) LiOH + HCl → LiCl + H₂O

General Formulas and Concepts:

<u>Chemistry - Reactions</u>

  • Synthesis Reactions: A + B → AB
  • Decomposition Reactions: AB → A + B
  • Single-Replacement Reactions: A + BC → AB + C
  • Double-Replacement Reactions: AB + CD → AD + BC

Explanation:

<u>Step 1: Define</u>

RxN A:   2Na + 2H₂O → 2NaOH + H₂

RxN B:   CaCO₃ → CaO + CO₂

RxN C:   LiOH + HCl → LiCl + H₂O

RxN D:   CH₄ + 2O₂ → CO₂ + 2H₂O

<u>Step 2: Identify</u>

RxN A:   Single Replacement Reaction

RxN B:   Decomposition Reaction

RxN C:   Double Replacement Reaction

RxN D:   Combustion Reaction

7 0
3 years ago
An isotope of which element could have 19 protons and 21 neutrons?
ioda
You will need Periodic Table for this problem.

As we know, the number of protons specifies Atomic number. So, the atomic number for this element is 19. 
Now, element having 19 protons must have 19 electrons, So, writing electronic configuration for 19 electrons,

                                 1s², 2s², 2p⁶, 3s², 3p⁶, 4s¹

So, valence shell is 4, means element is present in 4rt period. And number of electrons in 4rth shell are 1. Means element belong to group 1.

Take periodic table go to period 4 and group 1. Its Potassium (K).
8 0
3 years ago
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