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3 years ago

3. | Amanda has just entered an elevator. The elevator rises and

Physics

1 answer:

rjkz [21]3 years ago

7 0

Answer:

The speed of elevator fast and slows down shows through the diagram.

Explanation:

Given that,

Amanda has just entered an elevator. The elevator rises and stops at the third floor.

Let us consider the elevator at rest then the speed will be zero.

When elevator start from rest then the speed increases with constant acceleration and near the third floor it slow down with constant deceleration and finally becomes at rest at third floor.

We need to draw the diagram distance and time

Using given data,

First, the displacement A to B will be increases fastly and B to C the displacement increases slowly slowly.

Hence, The speed of elevator fast and slows down shows through the diagram.

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If a wave y(x, t) (6.0 mm) sin(kx (600 rad/s)t f) travels along a string, how much time does any given point on the string take

kipiarov [429]

Answer:

t₁ - t₂ = 0.0011 s

Explanation:

given,

y(x, t) = (6.0 mm) sin( kx + (600 rad/s)t + Φ)

now,

y m = 6 mm ω = 600 rad/s

y₁ = + 2.0 mm y₂ = -2 .0 mm

now,

2 = (6.0 mm) sin( kx + (600 rad/s)t + Φ)

-2 = (6.0 mm) sin( kx + (600 rad/s)t + Φ)

so,

kx + (600 rad/s)t₁ + Φ = $\dfrac{\pi}{180}sin^{-1}(\dfrac{1}{3})$ ......(1)

we have multiplied with π/180 to convert angle into radians

kx + (600 rad/s)t₂ + Φ = $\dfrac{\pi}{180}sin^{-1}(-\dfrac{1}{3})$ ......(2)

subtracting both the equation (1)-(2)

600(t₁-t₂) = $\dfrac{2\pi}{180}sin^{-1}(\dfrac{1}{3})$

now,

t₁ - t₂ = 0.0011 s

time does any given point on the string take to move between displacements is equal to 0.0011 s

3 0

4 years ago

you have two solid substances that look the same. What measurements would you take and which tests would you preform to determin

musickatia [10]

To see how much they weigh

7 0

3 years ago

A skateboarder is moving at a constant speed of

Flauer [41]

The amount of time that passes from when this skateboarder begins to slow down until she begins to move back down the incline is 8.75 seconds.

<u>Given the following data:</u>

Speed = 1.75 m/s

Acceleration = -0.2 $m/s^2$

To calculate the amount of time that passes from when this skateboarder begins to slow down until she begins to move back down the incline, we would apply the first equation of motion;

<h3>The formula for the first equation of motion.</h3>

Mathematically, the first equation of motion for a decelerating object is given by this formula;

$V=U-at$

<u>Where:</u>

a is the acceleration.

V is the final speed.

U is the initial speed.

t is the time measured in seconds.

Substituting the given parameters into the formula, we have;

$1.75 = 0-(-0.2)t\\\\1.75=0.2t\\\\t=\frac{1.75}{0.2}$

Time, t = 8.75 seconds.

Read more on acceleration here: brainly.com/question/24728358

8 0

3 years ago

Suppose that in a lightning flash the potential difference between a cloud and the ground is 1.3×109 V and the quantity of charg

Georgia [21]

Answer:

A) ΔU = 3.9 × 10^(10) J

B) v = 8420.75 m/s

Explanation:

We are given;

Potential Difference; V = 1.3 × 10^(9) V

Charge; Q = 30 C

A) Formula for change in energy of transferred charge is given as;

ΔU = QV

Plugging in the relevant values gives;

ΔU = 30 × 1.3 × 10^(9)

ΔU = 3.9 × 10^(10) J

B) We are told that this energy gotten above is used to accelerate a 1100 kg car from rest.

This means that the initial potential energy will be equal to the final kinetic energy since all the potential energy will be converted to kinetic energy.

Thus;

P.E = K.E

ΔU = ½mv²

Where v is final velocity.

Plugging in the relevant values;

3.9 × 10^(10) = ½ × 1100 × v²

v² = [7.8 × 10^(8)]/11

v² = 70909090.9090909

v = √70909090.9090909

v = 8420.75 m/s

4 0

3 years ago

5. An ion consist of 12 electrons and 11 proton. What is the charge<br> on the ion?

sammy [17]

Answer:

-1

Explanation:

Electrons have a negative charge and protons have a positive charge. (+11) + (-12) = -1

5 0

3 years ago