3 years ago

Which of the following would NOT affect the level at which a canoe floats in a pond

Physics

1 answer:

nataly862011 [7]3 years ago

5 0

Sry i was knowing the answer i forgot ;(

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A runner completes a 10 km run in about 45 minutes. What was the runner’s speed in km/h?

OlgaM077 [116]

Answer: 12.5 km/s

I don't really know how to explain this, but here is your answer.

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3 years ago

Two parallel plates have equal and opposite charges. When the space between the plates is evacuated, the electric field is E= 3.

svetlana [45]

Explanation:

The given data is as follows.

Electric field between plates without dielectric, $E_{1} = 3.50 \times 10^{5} V/m$

Electric field between the plates with dielectric, $E_{2} = 2.40 \times 10^{5} V/m$ .

Permittivity of free space, $\epsilon_{o}$ = $8.85 \times 10^{-12} C^{2}/Nm^{2}$

Now, we will determine the charge density as follows.

$\sigma_{i} = \epsilon_{o}(E_{1} - E_{2})$

= $8.85 \times 10^{-12} \times (3.50 \times 10^{5} - 2.40 \times 10^{5})$

= $9.735 \times 10^{-7} C/m^{2}$

Thus, we can conclude that the charge density on each surface of the dielectric is $9.735 \times 10^{-7} C/m^{2}$ .

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3 years ago

A desk was moved 12 m using 280 j of work. how much force was used to move the desk?

Oksana_A [137]

Let F = required force, N

Given:
d = 12 m, distance
W = 280 J, work done

By definition,
W = F*d,
therefore
(F N)*(12 m) = (280 J)
F = 280/12 = 23.33 N

Answer: The force is 23.3 N (nearest tenth)

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3 years ago

What is the speed of sound in air at 40°C?

Blababa [14]

343 meters per second Is the answer

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A period of the periodic table ends when the highest energy level of an elements atoms has __ electrons

never [62]

This is dependent on how many shells/layers/energy levels the element has. The first shell can only hold 2 electrons however every shell beyond that can hold 8 electrons

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3 years ago