2 years ago

What would a velocity of a rock dropped from a cliff be after falling for 6 seconds?

Physics

1 answer:

Ivenika [448]2 years ago

5 0

Answer:

A. 58.8m/s

Explanation:

The acceleration due to gravity is 9.8 m/s², so the velocity after 6 seconds is ...

v = at

v = (9.8 m/s²)(6 s) = 58.8 m/s

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A bond between a positively-charged particle and a negatively-charged particle is a(n) _______ bond.

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The answer is an ionic bond.

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3 years ago

A physical system that is isolated from its environment is:

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Closed

Explanation:

A physical system that is isolated from its environment is said to be a closed system.

In a closed system, energy can be exchange but matter cannot be exchanged.

A closed system sightly permits the only certain types of exchange.
These systems are usually used to control and limit the impact of the environment on a system.
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2 years ago

The CERN particle accelerator is circular with a circumference of 7.0 km.

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Answer:

$a_c=2.0196\times 10^{13}\ m/s^2$

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Explanation:

m = Mass of proton = $1.67\times 10^{-27}\ kg$

v = Speed of proton = 0.5c = $0.5\times 3\times 10^8=1.5\times 10^8\ m/s$

Circumference of the colider is 7 km

$P=2\pi r\\\Rightarrow r=\frac{P}{2\pi}\\\Rightarrow r=\frac{7000}{2\pi}\ m$

$a_c=\frac{v^2}{r}\\\Rightarrow a_c=\frac{\left(1.5\times 10^8\right)^2}{\frac{7000}{2\pi}}\\\Rightarrow a_c=2.0196\times 10^{13}\ m/s^2$

Centripetal acceleration is $2.0196\times 10^{13}\ m/s^2$

$F_c=ma_c\\\Rightarrow F_c=1.67\times 10^{-27}\times 2.0196\times 10^{13}\\\Rightarrow F=3.37273\times 10^{-14}\ N$

Force on protons is $3.37273\times 10^{-14}\ N$

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3 years ago

Which pair of elements has the most similar properties?

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The answer is B, because oxygen and sulfur are in the same group (group 6A)

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2 years ago

A train is pulling four train cars and each car has a mass of 40,000 kg. The train is accelerating at 1.1 m/s^2. What is the for

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Answer:

176,000 N

Explanation:

Newton's second law:

∑F = ma

F = (4 × 40,000 kg) (1.1 m/s²)

F = 176,000 N

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3 years ago

Read 2 more answers