How to find gravitational potential energy?

What is the moment of inertia of a cube with mass M=0.500kg and side lengths s=0.030m about an axis which is both normal (perpen

prisoha [69]

Answer:

The moment of inertia I is

I = 2.205x10^-4 kg/m^2

Explanation:

Given mass m = 0.5 kg

And side lenght = 0.03 m

Moment of inertia I = mass x radius of rotation squared

I = mr^2

In this case, the radius of rotation is about an axis which is both normal (perpendicular) to and through the center of a face of the cube.

Calculating from the dimensions of the the box as shown in the image below, the radius of rotation r = 0.021 m

Therefore,

I = 0.5 x 0.021^2 = 2.205x10^-4 kg/m^2

8 0

3 years ago

How long it take a train to cover 630km having a speed of 30 km/hr

noname [10]

Answer:

21 hours

Explanation:

well 30 x 20 = 600 than 21 = 630

4 0

3 years ago

The perimeter of a sector of a circle is the sum of the two sides formed by the radii and the length of the included arc. A sect

snow_tiger [21]

Answer:

Length of the arc of this sector, l = 14 cm

Explanation:

It is given that, the perimeter of a sector of a circle is the sum of the two sides formed by the radii and the length of the included arc.

Perimeter of sector, P = 28 cm

Area of sector, $A=49\ cm^2$

According to figure,

2r + l = 28 ............(1)

Area of sector, $A=\dfrac{\theta}{360}\times \pi r^2$

Where, $\theta$ is in radian and $\theta=\dfrac{l}{r}$

Since, $1^{\circ}=\dfrac{\pi}{180}\ radian$

$A=\dfrac{l}{2\pi r}\times \pi r^2$

$r=\dfrac{98}{l}$

Put the value of r in equation (1) so,

$2\times (\dfrac{98}{l})+l=28$

$l^2-28l+196=0$

On solving above equation for l we get, l = 14 cm. So, the length of the arc of this sector is 14 cm. Hence, this is the required solution.

5 0

3 years ago

A proton moving along the positive x-axis enters an electric field that is directed along the positive y-axis. What is the direc

katrin2010 [14]

Answer:

Direction of the electric force acting on the proton after it enters the electric field is along the positive y-axis.

Explanation:

In an electrical field electrical field lines goes from positive to negative. Therefore, electrical force vector is on exactly the same way with electrical field lines for a proton. Which means if the electrical field directed along the positive y-axis, electrical force for proton will be on the same way.

8 0

3 years ago

True or False <br><br> All objects emit electromagnetic waves.

MariettaO [177]

Answer:

true

explanations: especially hot body ie.above -273 tends to emit infrared type radiation

7 0

3 years ago