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zysi [14]
3 years ago
7

Gunther needs a 75% concentrated solution. When making his solution at room temperature, he could only make a solution that was

70% before the solute settled out.
What could he do to make his solution reach 75%?




Put the solution in an ice bath, dissolve the solute, and let it return to room temperature.

Heat the solution, dissolve the solute, and let it cool verifying nothing settled out.

Add more water, boil the solution, and dissolve the solute until the some of the water evaporates.

Keep the solution at room temperature, add more water, and dissolve the excess solute.
Physics
2 answers:
jolli1 [7]3 years ago
7 0

Answer:

Heat the solution, dissolve the solute, and let it cool verifying nothing settled out.  

Explanation:

Gwar [14]3 years ago
7 0

Answer:

B. Heat the solution, dissolve the solute, and let it cool verifying nothing settled out.

Explanation:

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A 20.0 kg suitcase is raised 3.0 m above a platform. How much work is done on the suitcase?
Lisa [10]

Answer:

600

Explanation:

m=20

g=10m\s2

h=3m

we have

w=m*g*h

=20*10*3

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The voltage between the cathode and the screen of a television set is 22 kV. If we assume a speed of zero for an electron as it
il63 [147K]

Answer:

v= 8.8*10⁷ m/s

Explanation:

  • Assuming no friction present, the change in electrical potential energy, must be equal in magnitude, to the change in kinetic energy of the electron.
  • The change in the electrical potential energy, can be expressed as follows:

       \Delta U = (-e)*\Delta V

  • The change in kinetic energy, assuming that the electron started from rest, can be written as follows:

       \Delta K = \frac{1}{2} *m*v^{2}

       ⇒\Delta K = -\Delta U

  • From the equation above, replacing by ΔK and ΔU, we have:

       -\Delta U =- (-e)*\Delta V =\Delta K = \frac{1}{2} *m*v^{2}

  • Solving for v:

        v=\sqrt{\frac{2*e*\Delta V}{m_{e}} } =\sqrt{\frac{2*1.6e-19C*22e3V}{9.1e-31kg}} }\\ v= 8.8e7 m/s

4 0
3 years ago
a man runs the London Marathon at an average speed of 8 mph, the route is 26 miles, what was his time in hours and minutes?​
svlad2 [7]

Explanation:

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6 0
3 years ago
A 60 kg student is standing atop a spring in an elevator that is accelerating upward at 3.0 m/s2. The spring constant is 2.5 x 1
dimaraw [331]

the spring will be compressed by 0.3072 m

Explanation:

acceleration of elevator=3 m/s²

mass of student= 60 Kg

spring constant=2.5 x 10³ N/m

the force on the student is given by F = m ( g +a)

F=60 (9.8+3)

F=768 N

now the formula for spring force is given by

F= k x

768= 2.5 x 10³ (x)

x=0.3072 m

6 0
3 years ago
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