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Marrrta [24]
3 years ago
5

A bicycle rider sees a car up ahead, and slows down to avoid a collision. He starts off traveling at 15 m s and slows down to 5

m s in 7.5 s. Find the acceleration of the bike rider.
Physics
1 answer:
kkurt [141]3 years ago
8 0

Answer:

a = -1.33 m/s^2

Explanation:

As we know that acceleration is rate of change in velocity

So here we have

a = \frac{v_f - v_i}{t}

so we will have

v_f = 5 m/s

v_i = 15 m/s

t = 7.5 s

now we have

a = \frac{5 - 15}{7.5}

a = -1.33 m/s^2

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How is the position vs. time graph with the cart moving towards the sensor with decreasing speed different than the position vs.
IrinaVladis [17]

Answer:

if Y is the position and X the time: in the first one you will see a crescent function that starts sharp and starts to curve down as the time pases. as the cart is slowing down, you will need more time to move the same as before.

Y (position)

I

sensor-------------------------------------------------------------------

I                                                    o

I                                     o

I                           o

I                   o

I            o

I       o

I   o

I------------------------------------------------------------------------------------- X (time)

in the second case the cart starts close to the sensor and starts getting sharper and sharper as the time pases. This is because the velocity is increasing, so for each second that pases, you will travel more distance that the second before it.

Y (position)

I

sensor ----------------------

I       o

I                 o

I                          o

I                                 o

I                                       o

I                                            o

I                                              o

I------------------------------------------------------------------------------------- X (time)

i hope you can understand it, kinda hard to do graphs here.

6 0
4 years ago
A ball has a mass of 4.65kg and approximates a ping pong ball of mass 0.060kg that is at rest by striking it in an elastic colli
Alona [7]

Answer:

Look at work

Explanation:

Elastic Collision: Ki=Kf

M1=4.65kg

M2: 0.060kg

v1=5m/s

v2=0m/s

4.65*5+0.060*0=4.65*v1'+0.060*v2'

23.25+0=4.65v1'+0.060v2'

Also since it is an elastic collision we can use

v1+v1'=v2+v2'

4.65+v1'=v2'

4.65+v1'=v2'

Substitute into the earlier equation

23.25=4.65v1'+0.060(4.65+v1')

Expand

23.25=4.65v1'+0.279+0.06v1'

Solve for v1'

22.971=4.71v1'

v1'=4.88m/s

v2'=4.65+4.88=9.53m/s

7 0
3 years ago
At what distance (in m) is the electrostatic force between two electrons equal to the weight of one?
Ksivusya [100]

Answer:

Explanation:

Given

Electrostatic force between two electrons is equal to weight of one electron

i.e.

\frac{kq_1q_2}{r^2}=m_e\cdot g

where q_1,q_2 are the charge of particles

m_e=mass of electron

r=distance between them

\frac{9\times 10^{9}\times 1.6\times 10^{-19}\times 1.6\times 10^{-19}}{r^2}=9.11\times 10^{-31}\times 9.8

r=5.08\ m  

3 0
3 years ago
Evaluating alternative options and choosing one option among them is called the theory of bounded rationality.
VikaD [51]

It is false, bounded rationality is the idea that rationality is limited when individuals make decisions. ... Limitations include the difficulty of the problem requiring a decision, the cognitive capability of the mind, and the time available to make the decision.

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2 years ago
What is star wars 1313
Vinvika [58]

star wars 1313 is a cancelled  video game ( action / adventure ) that was under development by lucas arts.

6 0
3 years ago
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