2 years ago

Which system protects us from radiation and the vacuum of space

2 answers:

6 0

It is the Earth's atmosphere that protects us from radiation and the vacuum of space--specifically UV radiation from the Sun, which can be very dangerous even with the atmosphere's intervention.

mars1129 [50]2 years ago

4 0

Ozone Layer, Atmosphere.

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2 years ago

Illustrate a body of mass 5.0kg pulled by horizontal force F . if the body accelerates 2.0ms² and experience a frictional force

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Explanation:

a. Net force is mass times acceleration (Newton's second law).

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c. Friction force here is mgμ.

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A uniform ladder 5.0 m long rests against a frictionless, vertical wall with its lower end 3.0 m from the wall. The ladder weigh

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Answer:(a)360N,(b)171N,(c)2.702m

Explanation:

(a)Maximum Friction Force = $\mu \left ( N\right )=0.4\times \left ( 740+160\right )$

=360 N

$cos\theta =\frac{3}{5}$

$sin\theta =\frac{4}{5}$

(b)Moment about Ground Point

$740\times 1\times cos\theta +2.5\times 160\times cos\theta -N_15sin\theta$

$N_1tan\theta =1140$

$N_1=171 N$

$N_1=f=171 N$

(c)

$740\times x\times cos\theta +2.5\times 160\times cos\theta -N_15sin\theta$

Here maximum friction force can be 360 N

Therefore $N_1=360 N$

Where x is the maximum distance moved by man along the ladder

$360\times 5\times \frac{4}{3}=740x+160\times 2.5$

740x=2000

x=2.702m

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2 years ago