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AleksandrR [38]

2 years ago

10

Graphs often permit scientists to make estimations for items when there is no data. Please select the best answer from the choic

es provided

1 answer:

Zinaida [17]2 years ago

3 0

Answer:

no they don't but I think it's 8

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What would the color of this star cluster appear to be if you observed it from a distance so great that you could not make out t

makkiz [27]

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D. blue

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2 years ago

A railroad car of mass 2.50 3 104 kg is moving with a speed of 4.00 m/s. It collides and couples with three other coupled railro

ipn [44]

Answer:2.5 m/s

37.5KJ

Explanation:

Let $u_1, u_2 , v_f$ be the initial velocity of rail road car ,coupled cars & Final velocity of system respectively.

$m=2.50\times 10^{4}$

Conserving momentum

$mu_1+3mu_2=4mv_f$

$4m+6m=4mv_f$

$v_f=2.5 m/s$

Therefore Final velocity of system is 2.5m/s

(b)Mechanical Energy lost =Initial Kinetic Energy -Final Kinetic Energy

$Initial Kinetic Energy=\frac{1}{2}m\left ( 4^2\right )+\frac{1}{2}m\left ( 2^2\right )=14m J$

$Final Kinetic Energy=\frac{1}{2}4m\left ( 2.5^2\right )=12.5m J$

$Mechanical Energy lost=14m-12.5m=3.75\times 10^4=37.5 KJ$

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3 years ago

melisa1 [442]

Answer:

D. mass to see how it affected stretch length of a rubber band

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2 years ago

Which of the following examples show increasing potential energy?

son4ous [18]

D. Riding a bike uphill
Increased height = increased potential energy

8 0

2 years ago

the body Will remain at rest or move at constant velocity unless acted by external net force are unbalance force

Vikentia [17]

Answer:

law of motion states that a body at rest remains at rest, or, if in motion, remains in motion at a constant velocity unless acted on by a net external force. This is also known as the law of inertia. Inertia is the tendency of an object to remain at rest or remain in motion.

can u give me

your crown to me please brainliest me id you like my answer

4 0

2 years ago