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Ksenya-84 [330]
3 years ago
8

Not everything in science is clear-cut, with obvious problems, experiments, theories, and solutions. Sometimes scientists gather

data
and evidence for which there is no apparent explanation
This was the case when early European astronomers recorded data of the planets' movements through the sky. While the stars.
Moon, and Sun all revolved around the Earth in simplo, seemingly circular patters, the planets moved forward and backward in wild
loops, and no one know exactly why this happened.
This was until Johannes Kepler guessed that maybe the planets move around the Sun, not in circular orbits, but in ellipses. This was
an idea that no one else had thought of, and when it was compared to recorded data, it proved to be correct
What does this example illustrate about the process of science?

A. Science sometimes requires creativity

B. Creative ideas are not useful in science

C. Mathematical theories always lead to scientific theories

D. Guessing should have no place in modern science
Physics
1 answer:
sergij07 [2.7K]3 years ago
4 0
A. science sometimes requires creativity
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A helium-neon laser emits light of wavelength 632.8 nm and has a power output of 16 mw. how many photons are emitted per second
NemiM [27]
The power of the laser is
P=16 mW=0.016 W
by using the relationship between power, energy and time, we can find the energy delivered by the laser in 1 second:
E=Pt=(0.016 W)(1 s)=0.016 J

The frequency of the photons of this light is given by
f= \frac{c}{\lambda}= \frac{3\cdot 10^8 m/s}{632.8 \cdot 10^{-9} m} =4.74 \cdot 10^{14} Hz
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In order to find the number of photons emitted per second, we must divide the total energy emitted by the laser by the energy of a single photon, and we get:
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7 0
3 years ago
A radio transfers 270 j of energy electrically, 94.5 j is transferred by sound. Work out the efficiency of this radio. Give your
MakcuM [25]

Answer:

35%

Explanation:

Given data

Amount of energy transferred (Input) = 270J

Amount of energy converted to sound (Output)=  94.5J

Efficiency = output/input*100

Efficiency= 94.5/270*100

Efficiency=0.35*100

Efficiency=35%

Hence the efficiency is 35%

6 0
3 years ago
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Zigmanuir [339]
4 times as much distance to stop
8 0
4 years ago
Step 2: Apply NEwton's second law Apply ∑Fy = may , what should ay be equal to, since the block doesn't move in the y direction
andrey2020 [161]

Answer:

∑Fy = 0, because there is no movement, N = m*g*cos (omega)

Explanation:

We can solve this problem with the help of a free body diagram where we show the respective forces in each one of the axes, y & x. The free-body diagram and the equations are in the image attached.

If the product of mass by acceleration is zero, we must clear the normal force of the equation obtained. The acceleration is equal to zero because there is no movement on the Y-axis.

3 0
3 years ago
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