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3 years ago

action and reaction are equal in magnitude and opposite in direction then why do they not balance each other.

Physics

1 answer:

NeX [460]3 years ago

7 0

Answer:

Newton’s third law of motion states that every action has an equal and opposite reaction. This indicates that forces always act in pairs. Reaction forces are equal and opposite, but they are not balanced forces because they act on different objects so they don’t cancel each other out.

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An 870 N firefighter, F_ff, stands on a ladder that is 8.00 m long and has a weight of 355 N, F_ladder. The weight of the ladder

castortr0y [4]

Answer:

Explanation:

Weight of the ladder is 355N

WL = 355N

The weight of the ladder acts at center of the ladder I.e at 4m from the bottom

Weight of firefighters is 870N

Wf = 870N

The fire fighter is at 6.3m from the bottom of the ladder.

N1 is the normal force exerted by the wall

N2 is the normal force exerted by the ground

Using Newton law

Check attachment

ΣFy = 0, since body is in equilibrium

N₂ - WL - Wf = 0

N₂ = WL + Wf

N₂ = 870 + 355

N₂ = 1225 N

This the normal force exerted by the ground on the wall.

Now to get N₁, let take moment about point A

So, before we take the moment we need to make sure that the forces are perpendicular to the plane(ladder), we need to resolve the weight of the ladder, firefighter and the normal of the wall to be perpendicular to the plane.

ΣMa = 0

Clockwise moment is equal to anti-clockwise moment

Moment Is the produce of force and perpendicular distance.

M = F×r

So,

WL•Cos50 × 4 + Wf•Cos50 × 6.3 —N₁•Sin50 × 8 = 0

355•Cos50 × 4 + 870•Cos50 × 6.3 =

N₁•Sin50 × 8

1825.52 + 3523.12 = 6.13N₁

6.13N₁ = 5348.64

N₁ = 5348.64/6.13

N₁ = 872.54 N.

The normal force exerted by the wall is 872.54N

5 0

3 years ago

Nuclear fusion is the combining of atomic nuclei to produce energy and

GenaCL600 [577]

Answer:

D) Radiation

Explanation:

Nuclear fusion is the combining of atomic nuclei to produce energy and radiation.

5 0

3 years ago

A cylinder that is 15 cm tall is filled with water. If a hole is made in the side of the cylinder, 4.0 cm below the top level. A

olga55 [171]

Answer:

About 13 cm

Explanation:

We are given that

Length of cylinder,l=15 cm= $15\times 10^{-2} m$

1 m=100 cm

h=4 cm= $\frac{4}{100}=0.04 m$

Horizontal velocity of the existing water stream= $v=\sqrt{2gh}$

Where $g=9.8m/s^2$

Using the formula

$v=\sqrt{2\times 9.8\times 0.04}=0.885m/s$

h'=l-h=15-4=11 cm= $\frac{11}{100}=0.11 m$

Initial velocity of water stream,u=0

$t=\sqrt{\frac{2h'}{g}}=\sqrt{\frac{2\times 0.11}{9.8}}=0.15 s$

Distance, d=vt

Using the formula

$d=0.885\times 0.15=0.133 m$

$d=0.133\times 100=13.3 cm\approx 13 cm$

6 0

3 years ago

4. Consider a 1 kg block is on a 45° slope of ice. It is connected to a 0.4 kg block by a cable

icang [17]

If an icy surface means no friction, then Newton's second law tells us the net forces on either block are

• m = 1 kg:

∑ F (parallel) = mg sin(45°) - T = ma … … … [1]

∑ F (perpendicular) = n - mg cos(45°) = 0

Notice that we're taking down-the-slope to be positive direction parallel to the surface.

• m = 0.4 kg:

∑ F (vertical) = T - mg = ma … … … [2]

Adding equations [1] and [2] eliminates T, so that

((1 kg) g sin(45°) - T ) + (T - (0.4 kg) g) = (1 kg + 0.4 kg) a

(1 kg) g sin(45°) - (0.4 kg) g = (1.4 kg) a

==> a ≈ 2.15 m/s²

The fact that a is positive indicates that the 1-kg block is moving down the slope. We already found the acceleration is a ≈ 2.15 m/s², which means the net force on the block would be ∑ F = ma ≈ (1 kg) (2.15 m/s²) = 2.15 N directed down the slope.

8 0

3 years ago

One of the heating systems we talked about in this course comprises of a system of ducts. What is the process by which heat is t

madreJ [45]

Answer: b- covection

Explanation:

Conduction: It is the circulation or transfer of heat through a metal or solid. For example, heat generated inside an enclosure can be transferred to the outer surface by means of conduction.so therefore conduction can not be the answer.

Convection is the circulation or tansfer of heat from a surface by means of a fluid such as air. Natural convection happens when air is heated: it expands, rises, and is replaced by cooler air. The amount of convection may be increased by using a fan to increase the flow of air.Likewise,Ducts are used to circulate air in the system. Since, air is circulated in the system, heat is transfered by convection.Hence,the answer is B-convection.

Radiation: Here, energy is radiated through the air by means of electromagnetic radiation. Since heat transfer through raidation does not involve contact between the heated object and the heated source,so energy is lost as light or through electromagnetic radiation. So C is wrong.

7 0

3 years ago

action and reaction are equal in magnitude and opposite in direction then why do they not balance each other.​

action and reaction are equal in magnitude and opposite in direction then why do they not balance each other.