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3 years ago

Which gives the correct relationship for kinetic energy?

Physics

2 answers:

Karolina [17]3 years ago

6 0

Answer: K = (m/2)*v^2

Explanation: The kinetic energy is the enrgy that an object has because of the movement of the object, and as the mass of the moving object increases, also should increase the energy (more mass requires more energy to ve moved)

So the equation of the kinetic energy is:

K = (m/2)*v^2

where m is mass and v is velocity squared, this also cna be written as:

half the product of the mass and the squared velocity

lisabon 2012 [21]3 years ago

5 0

Answer:

MV/2

Explanation:

Because that is what I've been taught

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A 20 metric ton train moves toward the south at 50 m/s. At what speed must it travel to have four times its original momentum

OverLord2011 [107]

Answer:

200 m/s

Explanation:

as momentum is a product of mass and speed, and mass is not changing, four times the speed will result in four times the momentum.

p = mv

4p = m(4v)

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2 years ago

A sling psychrometer works because the amount of cooling that occurs in the wet bulb is directly proportional to the ----- of th

ad-work [718]

<u>Temperature of the air</u>

According to sources, the most probable answer to this query is that the wet bulb is directly proportional to the temperature of the air. Thank you for your question. Please don't hesitate to ask in Brainly your queries.

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2 years ago

A satellite is spinning at 6.0 rev/s. The satellite consists of a main body in the shape of a sphere of radius 2.0 m and mass 10

bearhunter [10]

Answer:

605447.7066 kgm²/s

Explanation:

$m_1$ = Mass of sphere = 10000 kg

$m_2$ = Mass of rod = 10 kg

r = Radius of sphere = 2 m

l = Length of antenna = 3 m

Angular speed

$\omega=6\times 2\pi\\\Rightarrow \omega=37.69911\ rad/s$

Angular momentum is given by

$L=I\omega$

Moment of inertia of the satellite is

$I_s=\frac{2}{5}m_1r^2$

Moment of antenna of the satellite is

$I_a=\frac{1}{3}m_2l^2$

The angular momentum of the system is

$L=I_s\omega+I_a\omega\\\Rightarrow L=\left(\frac{2}{5}m_1r^2+2\times \frac{1}{3}m_2l^2\right)\omega\\\Rightarrow L=\left(\frac{2}{5}10000\times 2^2+2\times \frac{1}{3}\times 10\times 3^2\right)\times 37.69911\\\Rightarrow L=605447.7066\ kgm^2/s$

The angular momentum of the satellite is 605447.7066 kgm²/s

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3 years ago

A spring has a force constant of 310.0 N/m. (a) Determine the potential energy stored in the spring when the spring is stretched

skad [1K]

Answer:

(a) 0.2618 J

(b) 0.1558 J

(c) 0 J

Explanation:

from Hook's Law,

The energy stored in a stretched spring = 1/2ke²

Ep = 1/2ke² ......................... Equation 1

Where k = spring constant, e = extension, E p = potential energy stored in the spring.

(a) When The spring is stretched to 4.11 cm,

Given: k = 310 N/m, e = 4.11 cm = 0.0411 m

Substituting these values into equation 1

Ep = 1/2(310)(0.0411)²

Ep = 155(0.0016892)

Ep =155×0.0016892

Ep = 0.2618 J.

(b) When the spring is stretched 3.17 cm

e = 3.17 cm = 0.0317 m.

Ep = 1/2(310)(0.0317)²

Ep = 155(0.0317)²

Ep = 155(0.0010049)

Ep = 0.155758 J

Ep ≈ 0.1558 J.

e = 0 m, k = 310 N/m

Ep = 1/2(310)(0)²

Ep = 0 J.

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2 years ago

What is a matrix and reinforcement in the simplest explanation.

lesantik [10]

Matrix is an environment or material in which something develops. And reinforcement is a consequence that will strengthen an organism's future behavior.

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2 years ago