3 years ago

A car changes its speed by 2 meters per second each second. What is its acceleration?

Physics

2 answers:

svetoff [14.1K]3 years ago

8 0

Answer:

c. 2 m/s2

is the right answer.

KatRina [158]3 years ago

4 0

Answer:

2 m/s²

Explanation:

If changes speed by 2 meters per second each second means:

2 m/s²

Because it changes constantly it veloctity.

Remember the aceleration changes the velocity.

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The wavelengths of light emitted by a firefly span the visible spectrum but have maximum intensity near 550 nm. A typical flash

Reil [10]

Answer:

$3.3\cdot 10^{15}$

Explanation:

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$E_1 = \frac{hc}{\lambda}=\frac{(6.63\cdot 10^{-34}Js)(3\cdot 10^8 m/s)}{5.5\cdot 10^{-7} m}=3.6\cdot 10^{-19} J$

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$P=1.2 mW=0.0012 W$

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$t=100 ms=0.1 s$

so the total energy delivered in one flash is

$E=Pt=(0.0012 W)(0.1 s)=1.2\cdot 10^{-3}J$

This energy contains exactly N photons each of energy $E_1$ , so the number of photons emitted in one flash is

$N=\frac{E}{E_1}=\frac{1.2\cdot 10^{-3} W}{3.6\cdot 10^{-19}J}=3.3\cdot 10^{15}$

3 0

3 years ago