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pantera1 [17]
3 years ago
11

Which type(s) of electromagnetic radiation emitted by the Sun are absorbed by Earth’s atmosphere and do not reach Earth’s surfac

e?
A. long-wave radio waves, X-rays, and gamma rays
B. short-wave radio waves and gamma rays
C. infrared light, X-rays, and gamma rays
D. X-rays
Physics
1 answer:
gregori [183]3 years ago
5 0
Gamma rays, X-rays, most ultraviolet rays, and some infrared are absorbed by the atmosphere but do not reach the Earth's surface
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A car traveling 77 km/h slows down at a constant 0.45 m/s^2 just by "letting up on the gas." --Part a : Calculate the distance t
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Answer:

(a) 508.37 m

(b) 47.53 s

(c) 21.165 m

(d) 19.365 m

Explanation:

initial velocity, u = 77 km/h = 21.39 m/s

acceleration, a = - 0.45 m/s^2

(a) final velocity, v = 0

Let the distance traveled is s.

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v^{2}=u^{2}+2as

0^{2}=21.39^{2}-2 \times 0.45 \times s

s = 508.37 m

(b) Let t be the time taken to stop.

Use first equation of motion

v = u + at

0 = 21.39 - 0.45 t

t = 47.53 s

(c) Use the formula for the distance traveled in nth second

s_{n^{th}=u+\frac{1}{2}a\left ( 2n-1 \right )}

where n be the number of second, a be the acceleration, u be the initial velocity.

put n = 1, u = 21.39 m/s , a = - 0.45m/s^2

s_{n^{th}=21.39-\frac{1}{2}\times 0.45\left ( 2\times 1-1 \right )}

s_{n^{th}=21.165m

(d)  Use the formula for the distance traveled in nth second

s_{n^{th}=u+\frac{1}{2}a\left ( 2n-1 \right )}

where n be the number of second, a be the acceleration, u be the initial velocity.

put n = 5, u = 21.39 m/s , a = - 0.45m/s^2

s_{n^{th}=21.39-\frac{1}{2}\times 0.45\left ( 2\times 5-1 \right )}

s_{n^{th}=19.365m

5 0
3 years ago
Can some one help me with number 2 urgent?!
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A) I = 0
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