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4 years ago

How much energy must be removed from a 450 g block of ice to cool it from 0∘c to -20 ∘c?

1 answer:

3 0

<span>The energy removed from a 450 g block of ice can only be done with a few options: a colder freezing facility, liquid nitrogen, or stopping the energy at all and adding dry ice for a brief period. The 450 g block should loose heat energy faster in a thermostat set at -20 degrees just to maintain the ice formation.</span>

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The force needed to lift an object is equal in size to the gravitational

Elanso [62]

Explanation:

W.D. = F * s = 50N * 2m = 100J.

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3 years ago

What is the difference between an electrolyte and a nonelectrolyte

Pepsi [2]

Answer:

The difference between the Electrolyte and Non-Electrolyte are given in the explanation part.

Explanation:

ELECTROLYTES are salts or molecules which ionize in solution fully.
Electrolyte solutions thus conduct electricity readily.

whereas

NON ELECTROLYTES in water do not dissociate from ions,
non-electrolyte solutions do not conduct electricity.

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4 years ago

Heat pumps move heat from __________ to __________ areas & REQUIRES energy. *

sergejj [24]

The correct answer to this question is false

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3 years ago

If Vx = 7.00 units and Vy = -7.60 units, determine the magnitude of V⃗ .

Juliette [100K]

|V| = 10.33 units and the direction θ = -47.35° or 312.65°.

Given the x and y components of a vector, we can calculate the magnitude and direction from these components.

Applying the Pythagorean theorem we have that the magnitude of the vector is:

|V| = $\sqrt{Vx^{2}+Vy^{2} }$

|V| = $\sqrt{(7.00units)^{2}+(-7.60units)^{2}} = \sqrt{106units^{2}} = 10.33units$

The expression for the direction of a vector comes from the definition of the tangent of an angle:

tan θ = $\frac{Vy}{Vx}$ ------> θ = arc tan $\frac{Vy}{Vx}$

θ = arc tan $\frac{-7.60units}{7.00units}$

θ = -47.35° or 312.65°

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3 years ago

Acceleration is the rate at which what happens?

belka [17]

Answer:

Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.

may be it helped you

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3 years ago