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2 years ago

I need help with this one ! Explanation needed ~

Physics

1 answer:

weqwewe [10]2 years ago

5 0

Answer:

Please find here some hints :

Rule. Newton’s second law, or fundamental principle of dynamics, mentions that a resultant force exerted on an object is always equal to the product of the mass of that object by its acceleration. ... Each force applied to an object causes this object to accelerate in the direction of the force applied.

Is acceleration a force?

The acceleration force, sometimes called the inertia force, is the vehicle’s resistance to speed variations. It holds you back when you increase your speed and pushes you back when you slow down.

Explanation:

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A 2 kg block is pushed by an external force against a spring with spring constant 131 N/m until the spring is compressed by 2.1

Andrej [43]

Answer:

d = 19.92 m

Explanation:

As in this exercise there is friction we must use the relationship between work and energy

W = ΔEm

Look for energy in two points

Initial. Fully compressed spring

Em₀ = $K_{e}$ = ½ k x²

Final. When the block stopped

$Em_{f}$ = 0

Let's look for the work of the rubbing force

W = fr d cos θ

Since rubbing is always contrary to movement, θ = 180

W = - fr d

Let's use Newton's second Law, to find the force of friction

Y Axis

N- w = 0

N = mg

The equation for the force of friction is

fr = μ N

fr = μ mg

We substitute in the work equation

W = - μ m g d

We write the relationship of work and energy

-μ m g d = 0 - ½ k x²

d = ½ k x² / μ m g

Let's calculate

d = ½ 131 2.1 2 / (0.74 2 9.8)

d = 19.92 m

7 0

4 years ago

Which of the following are good safety measures during a thunderstorm? A. Talk on a phone with a cord. B. Go inside a closed bui

Alex73 [517]

B and C are the correct answers because when you stand in an open space the ground is an conductor therefore adding and electric shock to your day

7 0

3 years ago

Read 2 more answers

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sashaice [31]

Answer:

The answer is: Increase the Number of Ropes/Pulleys.

Explanation:

A "pulley" is an object that supports a particular movement such as supporting a force's change in direction (provided that the direction is applied to a cord). This is regarded as a "simple machine" consisting of a wheel on an axle. This helps guide cables or ropes.

This machine is used in order to decrease the amount of time it takes to do work, such as lifting of objects.

Remember that "mechanical advantage" refers to the ratio between the force applied to a machine and the force produced by it. So, when it comes to pulleys, the mechanical advantage increases when the number of ropes are also increased. They are directly proportional. This goes the same way with increasing the number of pulleys. Once you increase the number of pulleys, the mechanical advantage also increases.

8 0

3 years ago

What's the answer plz help?!

eimsori [14]

I think the answer is c chemical change

6 0

3 years ago

Read 2 more answers

Imagine you are in an open field where two loudspeakers are set up and connected to the same amplifier so that they emit sound w

Scilla [17]

Answer:

d= 5.62 m

Explanation:

In order to have destructive interference, the path difference from the sources to the listener must be an odd multiple of half wavelengths, as follows:

d = (2n+1) * λ/2

In orfer to know which is the wavelength, we can use the relationship between propagation speed (in this case speed of sound), frequency and wavelength:

v= λ*f ⇒ λ = v/f = 344 m/s / 688 1/sec = 0.5 m

So, the path difference must be, at least, λ/2:

d = b-a = λ/2, where b is the distance to the speaker B, and a, the distance to the speaker A.

Applying Pithagorean Theorem, as the perpendicular distance d (which is our unknown) is the same for the triangles defined by the horizontal distance to the listener, and the straight line from the new position to the sources, we can write:

d² = a²- (3.0)²

d² = b²- (3.5)²

As the left sides are equal, so do right sides:

a² - (3.0)² = b² - (3.5)²

⇒ b² - a² = (3.5)² - (3.0)² = 3.25

We can replace (b²- a²) as follows:

b² - a² = (b+a)(b-a) = 3.25 (2)

We know that b-a = λ/2 = 0.25

Replacing in (2), we have:

b+a = 3.25 / 0.25 = 13 m

b-a = 0.25 m

Adding both sides:

2*b = 13.25 m ⇒ b= 13.25 /2 = 6.63 m

⇒ d² = (6.63)² - (3.5)² = 31.6 m²

⇒ d=√31.6 m² = 5.62 m

3 0

3 years ago

I need help with this one ! Explanation needed ~ ​

I need help with this one ! Explanation needed ~