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3 years ago

7

Can a car moving with a negative velocity moves faster than a car moving with a positive velocity? explain.

1 answer:

Nesterboy [21]3 years ago

6 0

Answer:

Yes.

Explanation:

This is because "negative velocity" just means it is in the negative in relation to the point of 0. Negative velocity doesn't equal a decrease in velocity. For example lets say you were parked next to a cone (this cone represents zero) if you accelerate forwards then that would be positive acceleration. If you were to accelerate backwards, this would be in the negative direction, aka negative velocity.

SUMMARY:

A negative velocity means that the object which has the negative velocity is moving in the opposite direction of an object moving at a positive velocity. This is a question of frame of reference. The possibility for the velocity is what makes it different to the speed. Speed is only positive.

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A pen contains a spring with a spring constant of 270 N/m. When the tip of the pen is in its retracted position, the spring is c

vodka [1.7K]

Answer:

-0.9045 j

Explanation:

Here K= 270 N/m

distance 1 = 4.60 mm=0.0046 m

when pen is compressed ;

distance 2 = 6.70 mm + distance1 = 0.0067 m+0.0046 m= 0.0113 m

The pen store in itself two types of PE

Which is Initial PEi = 1/2 ×K× [ $distance 1^{2}$ =0.5×270×0.0046 =0.621 j

and Final PEf = 1/2 × K × $distance 2^{2}$ = 0.5×270×0.0113=1.5255 j

When the pen gets ready - it goes ahead distance d2 and is then pressed back distance d1 for writing.

Total PE when ready = 0.621-1.5255= - 0.9045 j

so, work = -0.9045 j

8 0

3 years ago

A moving particle fragments or decays into a particle moving at .53c, mass 135 MeV/c2, and a particle moving at .98c, mass 938 M

Svetllana [295]

Answer:

M = 1073 Mev/c2

u = 0.95 C

Explanation:

given data:

m1 =135 Mev/c2

v1 = 0.53 c

m2 = 938 Mev/c2

v2 = 0.98 c

from conservation of momentum principle we have

$\frac{mu}{\sqrt{1-\frac{u^2}{C^2}}} = \frac{m1v1}{\sqrt{1-\frac{V1^2}{C^2}}} +\frac{m1v1}{\sqrt{1-\frac{V2^2}{C^2}}}$

$\frac{mu}{\sqrt{1-\frac{u^2}{C^2}}} = \frac{135*0.53c}{0.848} +\frac{938*0.98c}{0.2}$

$\frac{mu}{\sqrt{1-\frac{u^2}{C^2}}} = 4680.6 C$ ...............1

Total mass of INITIAL particle M =m1+m2 = 1073 Mev/c2

using equation 1

$\frac{1073 u}{\sqrt{1-\frac{u^2}{C^2}}}= 4680.6C$

solving for u we get

u = 0.95 C

8 0

4 years ago

Two foam peanuts become equally charged as they fall out of a cardboard box. Each foam peanut carries a charge of 8 x 10^-4 C. I

jok3333 [9.3K]

Answer:

Answer labeled B : 2,304,000 N

Explanation:

Recall the formula for the electric force:

$F_e=9\,\,10^9\, \, \frac{q_1*q_2}{d^2} \\F_e=9\,\,10^9\, \, \frac{8\,10^{-4}*8\,10^{-4}}{0.05^2} \\F_e=2,304,000\,\,N$

which agrees with answer B provided.

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3 years ago

What is a creative name for an element? (like oxygen, phosphorus) try to make it good

Inga [223]

Oxyles i think this suite Oxyles what do you think.

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3 years ago

Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 44.0mph and half the

sashaice [31]

Answer:

52.47706 mph

54.5 mph

Explanation:

The average speed is given by

$V_{av}=\dfrac{Distance}{Time}$

$V_{av}=\dfrac{100}{\dfrac{50}{44}+\dfrac{50}{65}}\\\Rightarrow V_{av}=52.47706\ mph$

Julie's average speed on the way to Grandmother's house is 52.47706 mph

$V_{av}=\dfrac{44+65}{2}\\\Rightarrow V_{av}=54.5\ mph$

Average speed on the return trip is 54.5 mph

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3 years ago