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3 years ago

Help ppl ..I don’t know nothing

Physics

1 answer:

Leto [7]3 years ago

7 0

#2 - A metal railing rusting in camp weather. Rusting is a chemical change.

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Question 36 pls<br> Physics

Lera25 [3.4K]

$R=\frac{U}{I}=\frac{0.5V}{180\cdot10^{-6}A}\approx2.78k\Omega$

7 0

3 years ago

Which of the following statements is true?

Tresset [83]

Answer:

option A

Explanation:

the correct answer is option A

when the air temperature increases the relative humidity decreases.

When temperature increase the ability to hold water vapor decreases.

higher the water vapor more will be the amount of moisture content.

it take less water vapor to saturate air in a city with low temperature compared with high air temperature.

8 0

3 years ago

What does the big bang theory suggest

Alika [10]

Answer:

The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.

Explanation: Hope this help! :)

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3 years ago

If a bicycle has an average acceleration of -0.44 m/s^2, and its initial forward velocity is 8.2 m/s, how long will it take the

Papessa [141]

Answer:

The value is $t = 18.6 s$

Explanation:

From the question we are told that

The average acceleration of the bicycle is $v = -0.44 \ m/s^2$

The initial forward velocity is $u = 8.2 \ m/s$

Generally from kinematic equations we have that

$v = u + at$

Here v is the final velocity of the bicycle and the value is v = 0 m/s

$0 = 8.2 + (-0.44)t$

=> t = 18.6 s

7 0

3 years ago

A steel playground slide is 5.25 m long and is raised 2.75 m on one end. A 45.0 kg child slides down from the top starting at re

Temka [501]

Answer:

$F=32.24N$

Explanation:

From the question we are told that:

Height $h= 2.75 m$

Length $l = 5.25 m$

Mass $m=45kg$

Final speed $v_f=6.81$

Generally the equation for Potential Energy P.E is mathematically given by

$P.E=mgh$

Therefore

Initial potential energy

$P.E_1=45*9.8*2.75 \\\\P.E_1= 1212.75 J$

Generally the equation for Kinetic Energy K.E is mathematically given by

$K.E=0.5mv^2$

Therefore

Final kinetic energy

$K.E_2= 1/2*45*6.81*6.81 \\\\K.E_2= 1043.46J$

Generally the equation for Work_done is mathematically given by

$W=P.E_1-K.E_2\\\\W=169.3$

Therefore

$F=\frac{W}{d}\\\\F=\frac{169.3}{5.25}$

$F=32.24N$

8 0

3 years ago