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Viktor [21]
3 years ago
5

Which activity is a model of thermal energy transfer by conduction? A. Freezing ice cubes in a freezer B. Using a heat lamp to w

arm a bathroom C. Cooking vegetables on a grill D. Using a fan to cool down on a hot day
Physics
2 answers:
Law Incorporation [45]3 years ago
4 0

Answer:

B

Explanation:

B because thermal energy is heat and B is using heat

Ne4ueva [31]3 years ago
3 0

Answer:

Hot water rises and cold water sinks is a model of thermal energy transfer by conduction.

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8. two +1 C charges are separated by 3000m. What is the magnitude of the electric force between them?
Sidana [21]

Answer:

1000 N

Explanation:

The magnitude of the electrostatic force between two charged object is given by

F=k\frac{q_1 q_2}{r^2}

where

k is the Coulomb constant

q1, q2 is the magnitude of the two charges

r is the distance between the two objects

Moreover, the force is:

- Attractive if the two forces have opposite sign

- Repulsive if the two forces have same sign

In this problem:

q_1=q_2=+1C are the two charges

r = 3000 m is their separation

Therefore, the electric force between the charges is:

F=(9\cdot 10^9)\frac{(1)(1)}{3000^2}=1000 N

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