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3 years ago

If a spring stores 5 J of energy when it's compressed by .5 m, what is the spring constant of the spring?

Physics

2 answers:

adell [148]3 years ago

4 0

EPE= 0.5 * spring constant * (extension)^2

Spring constant=EPE/0.5*extension^2

5J/0.5*0.5^2

=40N/m

SVETLANKA909090 [29]3 years ago

4 0

Energy stored in a spring = (1/2) (spring constant) (stretch)²

5 Joules = (1/2) (spring constant) (0.5 m)²

10 Joules = (spring constant) (0.25 m²)

Spring constant = 10 joules / 0.25 m²

Spring constant = 40 Newton/meter

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3 years ago

A light ray incident on a block of glass makes an incident angle of 50.0° with the normal to the surface. The refracted ray in t

Andru [333]

Answer:

$n_{glass} = 1.65$

Explanation:

As we know that the angle of incidence is given as

$i = 50.0^o$

also we have angle of refraction as

$r = 27.7^o$

now by Snell's law we know that

$n_{air} sin i = n_{glass} sin r$

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3 years ago

What is the momentum of a man of mass 10kg when he walks with a uniform velocity of 2m/s.

Stolb23 [73]

Answer:

$Momentum(p) = 20kgm/s$

Explanation:

Given

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Velocity = 2m/s

Required

Calculate the momentum of the man

Momentum is calculated as thus

$Momentum(p) = Mass(m) * Velocity(v)$

$p = mv$

So; to solve this question; we simply substitute 10kg for mass and 2m/s for velocity in the above formula;

The formula becomes

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At what speed does a 1,248 kg compact car have the same kinetic energy as a 18,777 kg truck going 26 km/h?

notka56 [123]

The speed of car is 100.8km/h

$KE = \frac{1}{2} m(v \: truck ) {}^{2}$

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$= 489708.79j$

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$= 624v {}^{2}$

$so \: v {}^{2} = \frac{489708.7}{624}$

$= 784$

$v = \sqrt{784}$

$v = 28m/s$

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learn more about speed from here:

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