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3 years ago

When a cannon fires a cannonball, the cannon will recoil backward because the:

Physics

1 answer:

gulaghasi [49]3 years ago

4 0

C) total linear momentum of the ball and cannon is conserved.

Basically it happens that in the beginning before there is a momentum acting on the two bodies, these are a unique system. Here the total momentum of the System is 0. However, when the positive momentum of the cannonball is added, the system will be immediately affected by a negative momentum which will pull back the cannon. Could this be extrapolated as a condition of Newton's third law.

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Suppose an oxygen molecule traveling at this speed bounces back and forth between opposite sides of a cubical vessel 0.17 m on a

Nastasia [14]

Answer: The last part of the question has some details missing which is ; (Assume that the molecule's velocity is perpendicular to the two sides that it strikes.) molecule v=482 m/s molecule momentum=2.56 x 10^(-23)

Explanation:

The momentum of the molecule is 2.56 x 10^(-23) .
Particle hits the wall and bounces.
Momentum is reversed. Change in momentum = impulse
This is Force x time.
Momentum change happens at a wall after each trip.

time required = distance /speed

= 0.17 X 2/(482 m/s)

Average force = impulse / time

= 2 x 482 x 2.56 x 10^(-23) / (0.17 x 2)

= 7.76 x 10^20N, is the average force the molecule exerts on one of the walls of the container.

3 0

3 years ago

How much power is necessary to do 50 J of work in 5 seconds

Alex73 [517]

Power = Work / Time

If W = 50 J and T = 5s

P = W/T = 50J/5s = 10 Watts

7 0

4 years ago

Read 2 more answers

How does light travel from our light source? What kind of light is it and what is it made of?

suter [353]

Answer:

light is a form of energy produced by a light source. Light is made of photons that travel very fast. Photons of light behave like both waves and particles

Explanation:

4 0

3 years ago

Read 2 more answers

In a race, a runner traveled 12 meters in 4.0 seconds as she accelerated uniformly from rest. The magnitude of the acceleration

mestny [16]

The runner is moving by uniformly accelerated motion, starting from rest (so, his initial velocity is zero). The law of motion of the runner is
 $x(t) = \frac{1}{2} at^2$ 
where x(t) is the distance covered after time t, and a is the acceleration of the runner. By re-arranging the formula, we get
 $a= \frac{2S}{t^2}$ 
We know the runner has covered a distance of S=12m in t=4.0 s, and if we plug these numbers into the equation, we find the acceleration of the runner:
 $a= \frac{2S}{t^2} = \frac{(2*12m)}{(4s)^2} =1.5 m/s^2$

5 0

3 years ago

A 70.0-kg person rides in an elevator while standing on a scale. the scale reads 896 n. what is the magnitude and direction acce

Ksju [112]

If the elevator was stationary, the scale would read exactly the weight of the person:
$W=mg=(70 km)(9.8 m/s^2)=686 N$
However, the elevator is moving with an acceleration a, so the scale reads a new value of the weight, which we call W'. Newton's second law becomes
$W' = ma'$
where a' is actually the total acceleration of the person, so it's the sum of the acceleraion of the elevator and of the gravitational acceleration: $a'=a+g$
Taking the direction of g (downward) as the positive direction, we can find the value of a:
$W' = m(a+g)$
$a= \frac{W'}{m}-g= \frac{896 N}{70 kg}-9.8 m/s^2=3 m/s^2$
So, the acceleration of the elevator is $3 m/s^2$ , with same sign of g, so it's directed downward as well.

4 0

4 years ago