Physics, 29.07.2019 06:00 jpsaad00

Calculate the force exerted on a rocket when the propelling gases are being expelled at a rate of 1300 kg/s with a speed of 4.5 × 104 m/s.

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Answer from: kevonmajor

This question involves the concept of Newton's Second Law of Motion.

The force exerted on the rocket is "5.85 x 10⁷ N".

NEWTON'S SECOND LAW OF MOTION

According to Newton's Second Law of Motion, whenever an unbalanced force is applied to an object, it produces an acceleration in the direction of the force. Mathematically,

F=ma

where,

F = force = ?a = acceleration = $\frac{\Delta v}{t}$

Therefore,

$F = \frac{m\Delta v}{t}$

where,

$\frac{m}{t}$ = mass flow rate of gases = 1300 kg/sΔv = change in velocity = 4.5 x 10⁴ m/s

Therefore,

F = (1300 kg/s)(4.5 x 10⁴ m/s)

F = 5.85 x 10⁷ N

Learn more about Newton's Second Law of Motion here:

link

Answer from: averiemiranda1

Considering the rocket+gases as an isolated system, the variation of momentum of the rocket should be equal to the variation of momentum of the gases, which is
$\Delta p = \Delta m \cdot v$
since the speed v at which the gas is expelled is constant.
If we divide both terms per the time interval, $\Delta t$ , we get
$\frac{\Delta p}{\Delta t}= \frac{\Delta m}{\Delta t} v$
But $\frac{\Delta p}{\Delta t}$ is equal to the force F exerted on the gas by the rocket (and for Newton's third law, this is equal to the force exerted by the gas on the rocket), while $\frac{\Delta m}{\Delta t}$ is the rate at which the gas is expelled, 1300 kg/s. Therefore, the force exerted on the rocket is
$F= \frac{\Delta m}{\Delta t} v = (1300 kg/s)(4.5 \cdot 10^4 m/s)=5.85 \cdot 10^7 N$

Answer from: Quest

i don't understand. explain it clearly

Answer from: Quest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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