1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Anettt [7]
1 year ago
11

Imagine a 15kg block moving with a speed of 20m/s. Calculate the kinetic energy of this block.

Chemistry
1 answer:
SSSSS [86.1K]1 year ago
5 0

The kinetic energy formula is;

  • KE=\frac{m.v^2}{2}

The variable m represents the mass. Its unit is kilogram. We are informed that the mass of the object is 15kg. The variable v represents the linear velocity. Its unit is meter per second. We are informed that the linear velocity of the object is 20m/s. Let's find the kinetic energy of the object by substituting these values in the formula.

  • KE=\frac{15kg.(20m/s)^2}{2}
  • 2.KE=15kg.400m^2/s^2
  • 2.KE=(6000)kgm^2/s^2
  • KE=(3000)kgm^2/s^2=3000J
You might be interested in
8.43g of CaCl2·2H2O is dissolved in 40.0g of H2O. What is the molality of the solution? (Note that the H2O in the CaCl2·2H2O mus
lara31 [8.8K]

Answer:

[CaCl₂·2H₂O] = 1.43 m

Explanation:

Molality is mol of solute / kg of solvent.

Mass of solvent = 40 g

Let's convert g to kg → 40 g / 1000 = 0.04 kg

Let's determine the moles of solute (mass / molar mass)

8.43 g / 146.98 g/mol = 0.057 mol

Molality = 0.057 mol / 0.04 kg → 1.43

3 0
3 years ago
Read 2 more answers
Maria is baking cookies. She mixes water, flour, sugar, baking powder, butter and chocolate chips and then measures the mass of
Mrrafil [7]

Answer:

The law of conservation of mass was obeyed since some of the mass evaporated while the cookies were baking.

Explanation:

Maria mixes water, flour, sugar, baking powder, butter and chocolate chips and then measures the mass of her ingredients.

Initial mass of ingredients = 1053 g

Final mass = 845 g

All these information are not of any great help.

Law of conservation of mass states that:

For any system closed to all transfers of matter and energy, the mass of the system can not change with respect to time, as system's mass cannot change, any mass can neither be added nor be removed.

In this process of baking, considering the cookies as our system, they never formed a closed system. Hence were free for evaporation.

During the process of baking, water from dough must have evaporated and mass must have reduced.

Hence, the law of conservation of mass was not obeyed.

8 0
3 years ago
Read 2 more answers
Which of the following best describes the formation of plasma?
Sav [38]
I say, D is the answer

5 0
3 years ago
Mass = 386g volume= 30cm3
dezoksy [38]
Can you be more specific, I think the answer is 7.1506
7 0
3 years ago
Read 2 more answers
Methane and sulfur react to produce carbon disulfide (CS₂), a liquid often used in the production of cellophane.
Anestetic [448]

Answer:

9 moles

Explanation:

The balanced chemical equation provided in this question is as follows:

2CH₄ + S₈ → 2CS₂ + 4H₂S

In accordance to the above balanced equation, 1 mole of sulphur (S8) produces 4 moles of hydrogen sulfide (H2S).

Therefore, if 2.25mol of S8 is used, 2.25 × 4 = 9 mol

9 moles of H2S is produced.

6 0
3 years ago
Other questions:
  • Carbon-14 has a radioactive half-life of 5700 years. If an organism has 11.24 g of carbon-14 in its body at the time of its deat
    5·1 answer
  • The prefix centi- means (2 points) Select one: a. 103 b. 10-2 c. 10-3 d. 102
    13·1 answer
  • How many minutes will it take to plate out 4.50 g of Cu from a solution of Cu(NO3)2 (aq) onto the cathode of an electrolytic cel
    10·1 answer
  • Read the given expression.
    6·1 answer
  • You may remember that fresh water is the only type of water humans and animals can drink. For this reason, it is essential to li
    9·1 answer
  • Which of the following best matches a part of a living cell with the function it performs?
    8·1 answer
  • Differences between diamond and graphite​
    7·2 answers
  • Which is the correct Lewis dot structure of NH2-?
    15·1 answer
  • A 6.00 L container of N_2 has a temperature of 273 K. Calculate the volume if the temperature is doubled.
    11·1 answer
  • A student heats the same amount of two different liquids over Bunsen burners. Each liquid is at room temperature when the studen
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!