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Ronch [10]
3 years ago
5

which of the following does not represent a significant negative environmental impact of using nuclear fuel

Physics
1 answer:
Brrunno [24]3 years ago
3 0

Nuclear energy has practically no harmful emission (unless you consider water vapour to be bad).

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Two blocks, joined by a string, have masses of 6.0 kg and 9.0 kg. They rest on a frictionless horizontal surface. A 2nd string,
Gennadij [26K]

Answer:

Explanation:

30 N force is pulling total mass of 15 kg , so acceleration in the system of masses

= 30 / 15

= 2 m / s²

Let us now consider forces acting on 9 kg . 30 N is pulling it in forward direction . Tension T in the string attached to it is pulling it in reverse direction

so net force on it

30 - T

Applying Newton's law of motion on it

30 - T = mass x acceleration

30 - T = 9  x 2

30 - 18 = T

T = 12 N

4 0
4 years ago
The wavelength of red helium-neon laser light in air is 632.8 nm.
e-lub [12.9K]

(a) 4.74\cdot 10^14 Hz

The frequency of an electromagnetic wave is given by:

f=\frac{c}{\lambda}

where

c=3.0\cdot 10^8 m/s is the speed of the wave in a vacuum (speed of light)

\lambda is the wavelength

In this problem, we have laser light with wavelength

\lambda=632.8 nm=6.33\cdot 10^{-7} m. Substituting into the formula, we find its frequency:

f=\frac{3.0\cdot 10^8 m/s}{6.33\cdot 10^{-7} m}=4.74\cdot 10^14 Hz

(b) 427.6 nm

The wavelength of an electromagnetic wave in a medium is given by:

\lambda=\frac{\lambda_0}{n}

where

\lambda_0 is the original wavelength in a vacuum (approximately equal to that in air)

n is the index of refraction of the medium

In this problem, we have

\lambda_0=632.8 nm

n = 1.48 (index of refraction of glass)

Substituting into the formula,

\lambda=\frac{632.8 nm}{1.48}=427.6 nm

(c) 2.03\cdot 10^8 m/s

The speed of an electromagnetic wave in a medium is

v=\frac{c}{n}

where c is the speed of light in a vacuum and n is the refractive index of the medium.

Since in this problem n=1.48, we find

v=\frac{3\cdot 10^8 m/s}{1.48}=2.03\cdot 10^8 m/s

3 0
4 years ago
Performs Parts 1-3 in lab, Part 4 you answer by using your information gathered through Parts 1-3.
elena55 [62]
Oh okie oh gosh lol lol
5 0
3 years ago
NEED ASAP, WILL GIVE BRAINLIEST ANSWER
Brrunno [24]
12kN is equal to 12000 N
and the perpendicular component will be
[email protected]
mg = 12000 N
cos10°= 0.984
thus it will be 12000*0.984 = 11808N
the frictional force will be
[email protected]
sin10° = 0.1736
and hence it will be = 2083N
3 0
4 years ago
To a stationary, a bus moves south with a speed of 15 m/s. a man inside walks toward the front of the bus with a speed of 0.2 m/
marta [7]
It is 15.2 m/s South.
8 0
3 years ago
Read 2 more answers
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