¿Cual es la fuerza ejercida por el sol sobre la luna ?

(II) A 0.72-m-diameter solid sphere can be rotated about an axis through its center by a torque of 10.8 m • N which accelerates

kozerog [31]

Answer:

$m = 23.3 kg$

Explanation:

As we know that it will have constant torque on it

so the acceleration of the ball will be constant so here we can say that we can use kinematics equation

$\theta = \omega_i t + \frac{1}{2}\alpha t^2$

$160(2\pi) = 0 + \frac{1}{2}\alpha (15^2)$

$320 \pi = 112.5 \alpha$

so we have

$\alpha = \frac{320\pi}{112.5}$

$\alpha = 8.94 rad/s^2$

now we know that

$\tau = I \alpha$

$10.8 = I(8.94)$

$I = 1.21 kg m^2$

so we know that

$I = \frac{2}{5}mR^2$

here we know that

diameter = 0.72 m

so radius (R) = 0.36 m

$\frac{2}{5}m(0.36^2) = 1.21$

$m = 23.3 kg$

8 0

3 years ago

If one gram of matter could be completely converted into energy, the yield would be

noname [10]

Answer:

Energy, $E=9\times 10^{13}\ J$

Explanation:

It is given that,

Mass of matter, m = 1 g = 0.001 Kg

If this matter is completely converted into energy, we need to find the yield. The mass of an object can be converted to energy as :

$E=mc^2$

c = speed of light

$E=0.001\ kg\times (3\times 10^8\ m/s)^2$

$E=9\times 10^{13}\ J$

So, the energy yield will be $9\times 10^{13}\ J$ . Hence, this is the required solution.

5 0

4 years ago

Really need help with this Physics question!

mojhsa [17]

As we know that block of steel is continue to be in moving state

so here the friction must be kinetic friction between two surface

so we know that formula of kinetic friction must be

$F_k = \mu_k mg$

now we have

$\mu_k = 0.57$

$mg = 25 N$

now from the above equation we have

$F_k = 0.57\times 25$

$F_k = 14.25 N$

So here we need atleast 14.25 N force to continue sliding the box now as per given options all forces which are less than 14.25 N is not correct

Hence correct answer must be 18.0 N

8 0

3 years ago

An 8-inch dinner knife is sitting on a circular plate so that its ends are on the edge of the plate. if the minor arc that is in

Makovka662 [10]

When we form a right triangle connecting the edge of the knife to the center of the circle and the center of the knife to the center of the circle, the radius of the circle becomes the hypotenuse. Using the trigonometric function,
sin 60° = opposite / hypotenuse = 4 / hypotenuse
The value of the hypotenuse is 4.62 inches. Then, the diameter is twice this value which is 9.24 inches.

5 0

4 years ago

For a body falling freely from rest (disregarding air resistance), the distance the body falls varies directly as the square o

My name is Ann [436]

Answer:

The distance is 199.98 ft.

Explanation:

Given that,

Distance = 512 feet

Time = 88 sec

The distance the body falls varies directly as the square of the time.

$s\propto t^2$