Although technically energy and work are same things, there is intuitive difference between them.
work is an activity involving a force on an object and the distance traversed by the object due to the force. It can be measured by the change in energy.
Energy is capacity of doing work.For example if a something has energy of x joule it can perform x joule work.
Power is the work done in unit time.
Let the person at the Left be A and Person at the right be B
then the force by person A will be
Pulling force + Frictional Force = the force by the person
which is,
20N+11N=29N
then the force by person B will be,
25N+5N=30N
1) the net force will be 30N-29N=1N
2) the force are unbalanced as the net force acting on the object is not zero.
3) the rope will move towards the right as there is a net force of 1N towards the right.
The ratios which are needed to determine the mass of oxygen produced from the decomposition of 10 grams of potassium chlorate are;
- 31.998 g O2 : 1 mole O2
- 3 mole O2 : 2 mole KClO3
- 112.55 g KClO31 mole KClO3
From stoichiometry;
- We can conclude that according to the reaction;
3 moles of oxygen requires 2 moles of KClO3 to be produced.
And from molar mass analysis;
- 31.998 g O2 is equivalent to 1 mole O2
- O2112.55 g KClO3 is equivalent to 1 mole KClO3
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Answer:
0.882 ppm is the toxaphene concentration in the soil
Explanation:
One relation of units for ppm is mg/kg
Let's determine the mass of soil with the density.
Soil density = Soil mass / Soil volume
1700 kg / m³ = Soil mass / 1000 m³
1700 kg / m³ . 1000 m³ = Soil mass → 1.7×10⁶ kg
Let's convert the mass of toxaphene to mg
1.5 kg . 1 mg/ 1×10⁻⁶ kg = 1.5×10⁶ mg
1.5×10⁶ mg / 1.7×10⁶ kg = 0.882 ppm
Taking into account the definition of calorimetry, the mass of water is 4.4856 grams.
<h3>Calorimetry</h3>
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
- Q is the heat exchanged by a body of mass m.
- c is the specific heat substance.
- ΔT is the temperature variation.
<h3>Mass of water</h3>
In this case, you know:
- Q= 1500 J
- c= 4.18
- m= ?
- ΔT= 113 C - 33 C= 80 C
Replacing in the definition to calculate heat exchanges:
1500 J = 4.18 × m× 80 C
Solving:
1500 J = 334.4 × m
1500 J÷ 334.4 = m
<u><em>4.4856 g= m</em></u>
Finally, the mass of water is 4.4856 grams.
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