Answer:
No se bro cual se la respuesta .......
Explanation:
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Answer:
The time taken for the vehicle to pull a 500 N rock 100 meters is :
<u>t = 5 sec</u>
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Explanation:
Work = The magnitude of work is given by the product of force and displacement .
W = F x s
F = Force in Newton"N"
s = displacement "s"
In the question : F = 500 N and s = 100 m
W = F x s
W = 500 x 100
W = 50000 Nm
W = 50000 J
Power : It is the rate of doing work.The expression of power is given by :
W = Work = 50000 J
t = time
P = power = 10,000 Watt
Put the value in the formula:
t = 5 sec
You have to use the equation q=mcΔT and solve for c to get c=q/mΔT
q=the amount of energy absorbed or released (in this case 150J)
m= the mass of the sample (in this case 10g)
c=the specific heat capacity of the sample
ΔT=the change in temperature (in this case 115°C)
when you plug everything in you should get 0.1304J/g°C
I hope this helps. Let me know if anything is unclear.
Answer:
A solution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 mL solution. The weight/weight % or percent by mass of the solute is :
<u>2.67%</u>
Explanation:
Note : Look at the density of potassium nitrate in water if given in the question.
<u><em>You are calculating </em></u><u><em>weight /Volume</em></u><u><em> not weight/weight % or percent by mass of the solute</em></u>
Here the <u>weight/weight % or percent by mass</u> of the solute is asked : So first convert the<u> VOLUME OF SOLUTION into MASS</u>
Density of potassium nitrate in water KNO3 = 2.11 g/mL
Density = 2.11 g/mL
Volume of solution = 86.4 mL
Mass of Solute = 4.87 g
Mass of Solution = 183.2 g
w/w% of the solute =
w/w%=2.67%
Because correct coefficients are necessary to successfully balance equation.