Rays of light incident on a lens and parallel to the principal axis of the lens converge

2 answers:

8 0

<span>D. in back of the lens, because the rays are unaffected until it goes through the lens. In that moment the direction of the rays is modified, making them get closer to each other and all of them converge in a point behind the lens.</span>

N76 [4]4 years ago

3 0

Focal point of the lens

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The speed limit on some interstate highways is roughly 80 km/h. What is this in meters per second? How many miles per hour is th

sergey [27]

Answer:

1) Speed in m/s equals 22.22 m/s.

2) Speed in miles per hour equals 49.712 mph.

Explanation:

Since we know that in 1 kilometer there are 1000 meters and in 1 hour there are 3600 seconds hence we can write

$80km/h=\frac{80\times 1000m}{3600s}=22.22m/s$

Now we know that 1 mile equals 1.609 kilometer hence we conclude that 1 kilometer equals $\frac{1}{1.609}=0.6214$ mile

Hence

$80km/h=\frac{80\times 0.6214miles}{1h}=49.712mph$

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4 years ago

An object example to decrease pressure.

Olin [163]

Answer:

To reduce pressure - decrease the force or increase the area the force acts on. If you were standing on a frozen lake and the ice started to crack you could lie down to increase the area in contact with the ice. The same force (your weight) would apply, spread over a larger area, so the pressure would reduce.

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4 years ago

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A piano of mass 852 kg is lifted to a height of 3.5 m. How much gravitational potential energy is added to the piano? Accelerati

JulsSmile [24]

$m=852 \ kg \\ h=3,5 \ m \\ g=9,8 \ m/s^2 \\ \boxed{P_e-?} \\ \bold{Solving:} \\ \boxed{P_e=m \cdot g \cdot h} \\ P_e=852 \ kg \cdot 9,8 \ m/s^2 \cdot 3,5 \ m =8 \ 349,6 \ N \cdot 3,5 \ m \\ \Rightarrow \boxed{P_e=29 \ 223,6 \ J}$