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3 years ago

What force does a window washer want acting on him when trying to keep the same position

Physics

2 answers:

Ksenya-84 [330]3 years ago

8 0

That would be balanced.

svp [43]3 years ago

8 0

<h2>Answer:</h2>

The force he applies on himself is balanced force.

<h3>Explanation:</h3>

Balanced force means the net forces applied on himself will be zero. Which is forces applied on right side will be equal to left side forces. And upward forces will be equal to downward forces.
According to first law of motion, an object in rest can never be in motion except some force is exerted on it to do so.
Hence if force on window washer will be balanced force ( Net force = 0 ), then there will be no motion and he will be in same position.

<h3 />

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2 1100 kg cars drive east; the first moving at 30 m/s the 2nd at 15 m/s what is the magnitude of the total momentum of the syste

11Alexandr11 [23.1K]

<h3>Answer:</h3>

49500 kgm/s

<h3>Explanation:</h3>

Data given;

First car; Mass = 1100 kg
Velocity = 30 m/s
Second car; mass = 1100 kg
Velocity = 15 m/s

We are required to calculate the total momentum of the system.

We need to know that momentum is calculated by multiplying the velocity of a body by its mass.
Therefore;

Momentum of the first car = 1100 kg × 30 m/s

= 33,000 kgm/s

Momentum of the second car = 1100 kg × 15 m/s

= 16,500 kgm/s

Therefore;

Total momentum = 33,000 kgm/s + 16,500 kgm/s

= 49500 kgm/s

Thus, the total momentum of the system is 49500 kgm/s

4 0

4 years ago

A circular loop of wire lies in the plane of your screen. An increasing magnetic field (produced by another source) points out o

Rashid [163]

Answer:

clockwise direction

Explanation:

Direction of induced current is found with the help of Lenz's law . According to this law , the direction of induced current is such that it tries to neutralize or oppose the reason which creates this current .

In the given case , magnetic field is towards the viewer of the screen and it is increasing , so the induced current will have to create magnetic field in opposite to it . It means magnetic field will be created towards the screen into it . So the current will be induced in clockwise direction . This current will create magnetic field into the screen which will oppose increasing magnetic field out of screen .

7 0

3 years ago

An object has one force acting on it. It is a 33- Newton force pointing downward. To create a net force of zero on the object, w

Kamila [148]

As soon as I see "Which...", I know that the last part of the question is the list of answer choices, but you decided not to let us see them.

The answer is: A 33-Newton force pointing upward.

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3 years ago

Which law states that a charge cannot be created or destroyed?. A. Law of Conservation of Charge . B. Law of Conservation of Mot

Sedbober [7]

The correct answer for the given question above would be option D. The law that states that a charge cannot be created nor destroyed is the Law of Conservation of Energy. The Law of Conservation of Energy s<span>tates that the total amount of energy in an isolated system remains constant over time. Therefore, it can never be created nor destroyed.</span>

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4 years ago

Two 22.7 kg ice sleds initially at rest, are placed a short distance apart, one directly behind the other, as shown in Fig. 1. A

boyakko [2]

Newton's third law of motion sates that force is directly proportional to the rate of change of momentum produced

(a) The final speeds of the ice sleds is approximately 0.49 m/s each

(b) The impulse on the cat is 11.0715 kg·m/s

The reason for arriving at the above values is as follows:

The given parameters are;

The masses of the two ice sleds, m₁ = m₂ = 22.7 kg

The initial speed of the ice, v₁ = v₂ = 0

The mass of the cat, m₃ = 3.63 kg

The initial speed of the cat, v₃ = 0

The horizontal speed of the cat, v₃ = 3.05 m/s

(a) The required parameter:

The final speed of the two sleds

For the first jump to the right, we have;

By the law of conservation of momentum

Initial momentum = Final momentum

∴ m₁ × v₁ + m₃ × v₃ = m₁ × v₁' + m₃ × v₃'

Where;

v₁' = The final velocity of the ice sled on the left

v₃' = The final velocity of the cat

Plugging in the values gives;

22.7 kg × 0 + 3.63 × 0 = 22.7 × v₁' + 3.63 × 3.05

∴ 22.7 × v₁' = -3.63 × 3.05

v₁' = -3.63 × 3.05/22.7 ≈ -0.49

The final velocity of the ice sled on the left, v₁' ≈ -0.49 m/s (opposite to the direction to the motion of the cat)

The final speed ≈ 0.49 m/s

For the second jump to the left, we have;

By conservation of momentum law, m₂ × v₂ + m₃ × v₃ = m₂ × v₂' + m₃ × v₃'

Where;

v₂' = The final velocity of the ice sled on the right

v₃' = The final velocity of the cat

Plugging in the values gives;

22.7 kg × 0 + 3.63 × 0 = 22.7 × v₂' + 3.63 × 3.05

∴ 22.7 × v₂' = -3.63 × 3.05

v₂' = -3.63 × 3.05/22.7 ≈ -0.49

The final velocity of the ice sled on the right = -0.49 m/s (opposite to the direction to the motion of the cat)

The final speed ≈ 0.49 m/s

(b) The required parameter;

The impulse of the force

The impulse on the cat = Mass of the cat × Change in velocity

The change in velocity, Δv = Initial velocity - Final velocity

Where;

The initial velocity = The velocity of the cat before it lands = 3.05 m/s

The final velocity = The velocity of the cat after coming to rest =

∴ Δv = 3.05 m/s - 0 = 3.05 m/s

The impulse on the cat = 3.63 kg × 3.05 m/s = 11.0715 kg·m/s

(c) The required information

The average velocity

Impulse = $F_{average}$ × Δt

Where;

Δt = The time of collision = The time it takes the cat to finish landing = 12 ms

12 ms = 12/1000 s = 0.012 s

We get;

$F_{average} = \mathbf{\dfrac{Impulse}{\Delta \ t}}$

∴ $F_{average} = \dfrac{11.0715 \ kg \cdot m/s}{0.012 \ s} = 922.625 \ kg\cdot m/s^2 = 922.625 \ N$

The average force on the right sled applied by the cat while landing, $\mathbf{F_{average}}$ = 922.625 N

Learn more about conservation of momentum here:

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8 0

3 years ago