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Step2247 [10]
4 years ago
15

Momentum of a system is conserved only when question 16 options: there are no internal forces acting on the system. the system i

s not moving. there are no forces acting on the system. there is no net external force acting on the system. the system has zero momentum.
Physics
1 answer:
svp [43]4 years ago
6 0
Like mass and energy, it is already part of the natural phenomena that momentum is always conserved. However, just like energy, there are exception to this rule. This is when an external force is applied to the system which causes it to work reversely. <em>Therefore, momentum is conserved when no net external force is applied. </em>
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A busy waitress slides a plate of apple pie along a counter to a hungry customer sitting near the
Ostrovityanka [42]

Answer:

a. 0.5307 sec

b. 0.4458 m

c. =v_x=0.84\ m/s\ ,\ v_y=5.2\ m/s

Explanation:

Horizontal Motion

It describes the dynamics of an object thrown horizontally in free air. The initial horizontal velocity is maintained all the time since no horizontal forces are acting. The initial vertical velocity is zero at launch time, but it grows downwards powered by the acceleration of gravity.  

The object hits the ground at a distance x from the point of launching, after having traveled a vertical distance y_o, taking a time t to complete the travel. The formulas who relate the different magnitudes are

v_x=v_o

The horizontal velocity v_x is the same regardless of the elapsed  time

v_y=gt

x=v_ot

\displaystyle y=y_o-\frac{gt^2}{2}

The plate of apple pie left the counter at a speed  

v_o=0.84\ m/s

The counter is y_o=1.38\ m high.

a.

Knowing that

y_o=1.38\ m

We use this formula to compute t

\displaystyle y=y_o-\frac{gt^2}{2}

At the moment when the plate hits the floor y=0

\displaystyle 0=y_o-\frac{gt^2}{2}

\displaystyle y_o=\frac{gt^2}{2}

Solving for t

\displaystyle t=\sqrt{\frac{2y_o}{g}}

\displaystyle t=\sqrt{\frac{2(1.38)}{9.8}}

t=0.5307\ sec

b.

x=(0.84)(0.5307)

x=0.4458\ m

c.

v_x=0.84\ m/s

v_y=(9.8)(0.5307)

v_y=5.2\ m/s

3 0
4 years ago
¿Por qué si cargas a uno de tus compañeros por cierto tiempo no estás realizando un trabajo mecánico?
VladimirAG [237]

Answer:

I will answer this in English, we can translate it to:

Why if you charge a mate by an amount of time you are not doing work?

This happens because work is defined as the displacement done by a force:

W = d*F

where W is work, d is the distance, and F is the force.

This means that the amount of time that you are charging your mate does not affect the mechanical work, the only time that you are doing work is when you are lifting him.

4 0
4 years ago
An electric kettle is rated at 2 kW when connected to a 230 V electrical supply
Oliga [24]

Explanation:

a) P = IV

2000 W = I (230 V)

I = 8.7 A

b) The fuse must be rated for a higher current than the kettle, so use the 13A fuse.

c) Double insulation means there are two layers of insulation, insuring that the wires cannot touch the outer casing of the kettle and protecting the user from electrical shock.

d) V = IR

230 V = (8.7 A) R

R = 26.5 Ω

6 0
3 years ago
Which of the following is an example of a renewable natural resource?
borishaifa [10]

Answer:

c. lumber      

Explanation:

Lumber is considered a renewable natural resource because it is gotten from trees and trees are grow-able. A renewable natural resource is a resource which can be used repeatedly and replaced naturally. Examples of renewable natural resources are solar energy from the sun, water, oxygen, biomass, trees etc. Trees can be harvested and processed into lumber. The harvested trees can be planted again by humans or they can naturally reproduce through seedlings or fruits that drop and germinate on their own. This renewable germinating process of trees makes lumber a renewable natural resource.

6 0
3 years ago
When two volleyball players strike the ball on opposite sides of the net with the same amount of force, what happens?
cricket20 [7]

Answer:

The net force is zero because both volleyball players are hitting the ball with same force.

Explanation:

8 0
3 years ago
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