2 or more simple machines I hope this help :)
Answer: The predicted change in the boiling point of water is Δt = 0.0148 °C
Solution:
We will use the equation for boiling point elevation Δt
Δt = i Kb m
where the van't Hoff Factor i is equal to 3 since one molecule of barium chloride in aqueous solution will produce one Ba2+ ion and two Cl- ions. The molality m of the solution of 4.00 g of barium chloride dissolved in 2.00 kg of water can be calculated using the molar mass of barium chloride:
m = [4.00g BaCl2 * (1 mol BaCl2 / 208.233g BaCl2)] / 2.00kg H2O
= 0.009605 mol/kg
Therefore, the amount Δt the boiling point increases is
Δt = i Kb m
= (3) (0.512 °C·kg/mol) (0.009605 mol/kg)
= 0.0148 °C
We can also find the new boiling point T for the solution since we know that pure water boils at 100 °C:
Δt = T - 100°C T = Δt + 100°C = 0.0148 °C + 100°C = 100.0148°C
Answer: 1.788 volts.
Explanation:
To solve this problem we can combine battery cells to create higher voltages. Building more lemon batteries and connecting them with a metal wire from "+" to "-" adds the voltage from each cell. The two lemon batteries above, combine to produce a voltage of 1.788 volts.
Answer:
A. ![\lambda_0=2.196\times 10^{-7}\ m](https://tex.z-dn.net/?f=%5Clambda_0%3D2.196%5Ctimes%2010%5E%7B-7%7D%5C%20m)
Explanation:
The work function of the Platinum =
For maximum wavelength, the light must have energy equal to the work function. So,
Where,
h is Plank's constant having value
c is the speed of light having value
is the wavelength of the light being bombarded
Thus,
![\frac{9.05}{10^{19}}=\frac{19.878}{10^{26}\lambda_0}](https://tex.z-dn.net/?f=%5Cfrac%7B9.05%7D%7B10%5E%7B19%7D%7D%3D%5Cfrac%7B19.878%7D%7B10%5E%7B26%7D%5Clambda_0%7D)
![9.05\times \:10^{26}\lambda_0=1.9878\times 10^{20}](https://tex.z-dn.net/?f=9.05%5Ctimes%20%5C%3A10%5E%7B26%7D%5Clambda_0%3D1.9878%5Ctimes%2010%5E%7B20%7D)
![\lambda_0=2.196\times 10^{-7}\ m](https://tex.z-dn.net/?f=%5Clambda_0%3D2.196%5Ctimes%2010%5E%7B-7%7D%5C%20m)