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3 years ago

Can someone help me :)

Physics

2 answers:

zhenek [66]3 years ago

6 0

Answer:

undergone a chemical change

Explanation:

aivan3 [116]3 years ago

6 0

Answer:

undergone a chemical change

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A ball rolls down a hill, starting from rest. How long is it rolling if it accelerates at 3m/s2 and ends with a velocity of 35m/

Kryger [21]

<h2>Answer</h2>

The answer to this question is $11.67 s$

<h2>Explanation</h2>

As we know that accelartion is the rate of change of velocity. So, it can be write as

$a = (V_f -V_i) /t$

where

$V_f$ is the final velocity

$V_i$ is the initial velocity

t is the time

a is the accelartion

as we konw

$a = 3 ms^{-2}$

t = ?

From rest So,

$V_i$ = 0

$V_f = 35 ms^{-1}$

Putting values

$3 = (35 - 0)/t$

$3 = 35/t$

$t = 35/3$

$t = 11.67 s$

So, the right answe is $11.67 s$

6 0

3 years ago

Interactive LearningWare 8.1 reviews the approach that is necessary for solving problems such as this one. A motorcyclist is tra

STALIN [3.7K]

Answer:

The angular displacement of each wheel is 269.92 rad

Explanation:

Given:

Angular acceleration $\alpha = 6.10 \frac{rad}{s^{2} }$

Time to pass cyclist $t = 4.36$ s

Angular velocity $\omega _{f} = 75.2 \frac{rad}{s}$

According to the equation of kinematics,

$\omega _{f} = \omega _{i} + \alpha t$

$\omega _{i} = \omega _{f} - \alpha t$

$\omega _{i} = 75.2 - 6.10 \times 4.36$

$\omega _{f} = 48.60$ $\frac{rad}{s}$

For finding angular displacement,

$\omega _{f} ^{2} - \omega _{i} ^{2} = 2 \alpha \theta$

Where $\theta =$ angular displacement,

$\theta = \frac{\omega _{f}^{2} - \omega _{i} ^{2} }{2\alpha }$

$\theta = \frac{5655.04 - 2361.96 }{2\times 6.10 }$

$\theta = 269.92$ rad

Therefore, the angular displacement of each wheel is 269.92 rad

8 0

3 years ago

All electric charge is based on the protons and electrons in atoms. true or false

Free_Kalibri [48]

Answer:

true

Explanation:

electric charge is determined by electrons and protons, which are subatomic particles.

4 0

3 years ago

According to John daltons observations ,when elements combine in a compound

aalyn [17]

Answer:

Explanation:

A. The ratio of their masses is always the same

3 0

3 years ago

one layer of earth's atmosphere is called the stratosphere. At one point above earth's surface the stratosphere extends from an

masya89 [10]

According to all the given requirements

stratosphere x starts at an altitude of 16 km

that means

<span>16≤x

</span> and,as given ,stratosphere ends at an altitude of 30 km:
which means
<span>x≤30</span> combining both of them we get

<span>16≤x≤30</span> So the range of the stratosphere is from 16 to 30 km.

8 0

3 years ago

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