Which type of soil is the most permeable?

A 525 kg satellite is in a circular orbit at an altitude of 575 km above the Earth's surface. Because of air friction, the satel

Dafna1 [17]

Answer:

$1.69\cdot 10^{10}J$

Explanation:

The total energy of the satellite when it is still in orbit is given by the formula

$E=-G\frac{mM}{2r}$

where

G is the gravitational constant

m = 525 kg is the mass of the satellite

$M=5.98\cdot 10^{24}kg$ is the Earth's mass

r is the distance of the satellite from the Earth's center, so it is the sum of the Earth's radius and the altitude of the satellite:

$r=R+h=6370 km +575 km=6945 km=6.95\cdot 10^6 m$

So the initial total energy is

$E_i=-(6.67\cdot 10^{-11})\frac{(525 kg)(5.98\cdot 10^{24} kg)}{2(6.95\cdot 10^6 m)}=-1.51\cdot 10^{10}J$

When the satellite hits the ground, it is now on Earth's surface, so

$r=R=6370 km=6.37\cdot 10^6 m$

so its gravitational potential energy is

$U = -G\frac{mM}{r}=-(6.67\cdot 10^{-11})\frac{(525 kg)(5.98\cdot 10^{24}kg)}{6.37\cdot 10^6 m}=-3.29\cdot 10^{10} J$

And since it hits the ground with speed

$v=1.90 km/s = 1900 m/s$

it also has kinetic energy:

$K=\frac{1}{2}mv^2=\frac{1}{2}(525 kg)(1900 m/s)^2=9.48\cdot 10^8 J$

So the total energy when the satellite hits the ground is

$E_f = U+K=-3.29\cdot 10^{10}J+9.48\cdot 10^8 J=-3.20\cdot 10^{10} J$

So the energy transformed into internal energy due to air friction is the difference between the total initial energy and the total final energy of the satellite:

$\Delta E=E_i-E_f=-1.51\cdot 10^{10} J-(-3.20\cdot 10^{10} J)=1.69\cdot 10^{10}J$

8 0

3 years ago

what term is used to describe the block of organs (heart, lungs, liver, kidneys and spleen) that are removed during the autopsy?

aliya0001 [1]

Answer:

Thoracic organs

Explanation:

5 0

3 years ago

A motor and generator perform opposite functions, but their fundamental structure is the same. Their structure is a coil mounted

dmitriy555 [2]

<u>Answer :</u>

correct choice is option A

Motors convert electrical energy into mechanical energy. Generators convert mechanical energy into electrical energy.

Explanation :

Their difference is described as;

Premise MOTOR

The Motor Converts Electrical imperatives into vitality .
It uses control. (power)
In partner degree motor this is to be given to the curl winding
The Shaft of the motor is driven by the drawing in power made among loop and field.
Engine seeks after Fleming's left guideline.

GENERATOR

Generator changes over Mechanical essentialness to Electrical imperatives .
It produces control (electricity)
In the generator current is conveyed inside the curl winding.
The Shaft is associated with the rotor and is driven by mechanical power.
Generator seeks after Fleming's correct guideline. .

6 0

3 years ago

A coin rests on a record 0.13 m from its center. The record turns on a turntable that rotates at variable speed. The coefficient

igor_vitrenko [27]

Answer:

Maximum speed of the coin, v = 0.607 m/s

Explanation:

It is given that,

A coin rests on a record 0.13 m from its center i.e. the radius of the circular path, r = 0.13 m

The coefficient of static friction between the coin and the record is, $\mu=0.29$

The centripetal force acting on the coin is balanced by the frictional force. Its mathematical relation is given by :

$\dfrac{mv^2}{r}=\mu mg$

$v=\sqrt{\mu gr}$

$v=\sqrt{0.29\times 9.8\times 0.13}$

v = 0.607 m/s

So, the maximum coin speed at which it does not slip is 0.607 m/s. Hence, this is the required solution.

3 0

3 years ago

Select the correct answer.

soldi70 [24.7K]

Answer:

3

Explanation:

first you find the original component of the force be a cause in 36 degrees then with ka sin 36 find the average interforce by multiplying it with hundred Newton then divide the original force by the mass 25 Kg is equals tto ma

8 0

3 years ago