3 years ago

NEED HELP HELP HELP WILL GIVE BRAINLIST PLEASE

Physics

1 answer:

Elena-2011 [213]3 years ago

8 0

When the object is between the pole and the focus the image formed is behind the mirror

The image formed will be virtual , erect and magnified

Hope it helps

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The power of a red laser (λ = 630 nm) is 3.25 watts (abbreviated w, where 1 w = 1 j/s). how many photons per second does the las

lisabon 2012 [21]

The energy delivered by the laser in 1 second is $E_t=Pt = (3.25 W)(1.0 s)=3.25 J$
In order to find how many photons correspond to this energy, we must calculate the energy of a single photon.
Calling h the Planck constant, c the speed of light and $\lambda=630 nm=630 \cdot 10^{-9}m$ the wavelength of the light, the energy of a single photon is given by
$E=h \frac{c}{\lambda}=(6.6 \cdot 10^{-34} Js) \frac{3 \cdot 10^8 m/s}{630 \cdot 10^{-9}m}= 3.1 \cdot 10^{-19} J$

So, the number of photons emitted by the laser in 1 second is equal to the total energy delivered by the laser divided by the energy of a single photon:
$N= \frac{E_t}{E}= \frac{3.25 J}{3.1 \cdot 10^{-19} J} =1.0 \cdot 10^{19}$ photons

5 0

3 years ago

PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!! I CANNOT RETAKE THIS!!

Dennis_Churaev [7]

The answer to your question is,

Direction.

-Mabel <3

8 0

3 years ago

Read 2 more answers

10. Discrimination refers to behaviors that

salantis [7]

Answer:

Explanation:

the only one that makes sense

4 0

3 years ago

if you throw a 0.25-kg ball with a force of 20 n, what's the acceleration of the ball? a. 80 m/s2 b. 12.5 m/s2 c. 5 m/s2 d. 40 m

nata0808 [166]

To answer this question, we can use Newton's Second Law:

F = ma

We know that:
F = 20N
m = 0.25kg

So, we can plug what we know into the equation and isolate for the acceleration.

20 = 0.25a

a = 80m/s^2 which corresponds to answer A

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3 years ago

A boat is headed with a velocity of 18 meters/second toward the west with respect to the water in a river. If the river is flowi

artcher [175]

Answer:

20.5

Explanation:

in this case, the two vectors are in the same direction, so they simply add:

total motion = 18m/s + 2.5m/s = 20.5m/s to the west

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3 years ago