which machine have 100% efficiency​

Answer:

W= work

F= force

D= Displacement

Explanation:

Work can be calculated with the equation: Work = Force × Distance.

Answer:

A

Explanation:

Image result for Which describes refraction? the reflection of light as it passes through a substance the focusing of light as it passes through a substance the emission of light as it passes through a substance the bending of light as it passes through a substance

When electromagnetic radiation, in the form of visible light, travels from one substance or medium into another, the light waves may undergo a phenomenon known as refraction, which is manifested by a bending or change in direction of the light.

Explanation:

Motor evoked potentials (MEPs) are the electrical signals recorded from the descending motor pathways or from muscles following stimulation of motor pathways within the brain.

Espero eso ayude. Marque como más inteligente.

Answer:

0.75m

Explanation:

V=FX

3×10^8=4×10^8×X

X= 3×10^8/4×10^8= 0.75m

Newton's second law allows us to find the force applied to the student so that it has an upward acceleration of 27.4 m / s² is:

            F = 1.94 10³ N

Newton's second law says that the force is proportional to the product of the mass and the acceleration of the body.

         ∑ F = m a

Where F is the force, m the mass and the acceleration of the body.

A free body diagram is a diagram of the forces without the details of the bodies, in the attachment we have a free body diagram of the system.

They indicate that the student's mass is 52.1 kg and his acceleration is 27.4 m / s², let's write Newton's second law.

           F - W = ma

            F = m a + W

Body weight is.

            W = mg

            F = m (a + g)

We calculate.

            F = 52.1 (27.4+ 9.8)

            F = 1.94 10³ N

In conclusion using Newton's second law we can find the force applied to the student is:

            F = 1.94 10³ N

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Answer:

PLS MARK BRAINLIEST

Explanation:

f=m (v- u)/t

u=0m/s

v=10m/s

t=4 secs

m=1500kg

f=1500(10-0)/4

f=3750N

Phát biểu nào sau đây sai?

A. Hàm lượng cacbon trong thép cao hơn trong gang.

B. Sắt là kim loại màu trắng hơi xám, dẫn nhiệt tốt.

C. Quặng pirit sắt có thành phần chính là FeS2.

D. Sắt (III) hiđroxit là chất rắn, màu nâu đỏ, không tan trong nước.

D. Sắt (III) hiđroxit là chất rắn, màu nâu đỏ, không tan trong nước.

CARRY ON LEARNING

CAN YOU BRAINLEST ME

Answer:4.99km

Explanation:

We'll use s for distance, and t for time in seconds.

s = (1/2)at²

t = 0.5 minute*(60sec/1min)=30 sec

s = (1/2)*(2.2m/s²)(30sec)²

s = 990m

Reference point is 4km at start.  Distance from reference point is 9km + 0.990km = 4.99km

Answer:

c for me

Explanation:

I don't think so

if I'm correct if I'm wrong

Answer:

a. points u and z

Explanation:

amplitude, in physics, the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position

Answer:

as we know Speed=Distance÷Time

Distance=Speed×Time

Velocity=Displacement÷Time

Displacement=Velocity×Time

u haven't given the speed and all give it and I will tell the answer

The vertical force P, that will just be sufficient to lift the end Y from the ground is 600 N.

If the force P is applied at end X, it will not be sufficient to lift end X from the ground because the force P is acting downwards.

The sketch of the rod is presented as follows;

|---- 2 ----------|---------------------- 3 ----------------------|

X-----------------------------------------------------------------Y

P                    ↓

                      40 kg

Take moment about the center of gravity;

P(2) = 40 x g (3)

2P = 40 x 10 (3)

2P = 1200

P = 600 N

Thus, the vertical force P, that will just be sufficient to lift the end Y from the ground is 600 N.

If the force P is applied at end X, it will not be sufficient to lift end X from the ground because the force P is acting downwards.

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Answer:

Tropical region

Explanation:

because the regions near the equator are called tropical regions

Answer:

Water is a liquid at standard temperature and pressure (25 degrees Celsius and 1 atm, for liquids). Water is is tasteless and odorless.

Explanation:

Answer:

Water and power come from external sources.

Explanation:

Answer:

Explanation:

Think about hockey for little to no friction if you push on the puck it moves fast and far.

Now imagine taking the same puck and pushing it on gravel or grass it will not have the same motion.

The integral of the function of the force applied to the time of application

of the force gives the impulse of the force.

The speed with which the ball rebounds from the plate is approximately

34.23 m/s.

Reasons:

Force = Rate of change of momentum

F × t = m·(v₂ - v₁)

Where;

Speed of the ball, v₁ = 16 m/s

v₂ = The speed with which the ball rebounds from the plate

The impulse, I, of the force is given by the area under the curve.

The height of the triangular curve, h = 2,500 N

The base length of the triangular curve = 7 ms.

Area of a triangle = [tex]\frac{1}{2}[/tex] × Base length × Height

Therefore, we have;

[tex]Area \ under \ the \ curve, \, I = \dfrac{0.007 \times 2500}{2} = 8.75[/tex]

8.75 = 0.48 × (v₂ - 16)

v₂ ≈ 34.23 m/s

Therefore, the speed with which the ball rebounds, v₂ ≈ 34.23 m/s.

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https://brainly.com/question/20595307

https://brainly.com/question/13769802

Answer:

F = 1200 N

General Formulas and Concepts:

Forces

Newton's Second Law of Motion: F = ma

Explanation:

Step 1: Define

Identify variables

m = 300 kg

a = 4 m/s²

Step 2: Find Force

Topic: AP Physics 1 - Algebra Based

Unit: Forces

Answer:

Amplitude

Explanation:

Answer:

the wave trough.

Explanation:

As is shown on the figure, wave height is defined as the height of the wave from the wave top, called the wave crest to the bottom of the wave, called the wave trough. The wave length is defined as the horizontal distance between two successive crests or troughs.

Hi there!

On a horizontal circular track with friction, the net force acting in the horizontal direction is:

∑F = Fκ, or the force of kinetic friction.

We know that ΣF = Mv²/r, so:

Mv²/r = Fκ

Plug in the given values to solve:

(1750)(35²)/80 = Fκ

Thus:

Fκ = 26796.875 N

Answer:

When two surfaces slide against each other, a force called friction makes them stick very slightly together. Smooth surfaces, like ice and glass, are easy to slide over

Explanation:

They create very little friction. Rough surfaces like rock and sand create much more friction, and are easy to grip on to.

Hello There!

Smooth Surfaces are easier to slide over. That's true.

Take an object and slide it across a rough surface. Now, slide the same object across a smooth surface.

What do you see?

I expect you wil find out that smooth surfaces are easier to slide over.

Reason:

Smooth surfaces have less friction than rough ones.

Hope it helps!

Answer:

Radio telescopes .

Explanation:

They have a modest size that can't make out as much detail (have a lower resolution) than visible light telescopes

At the bottom left,

Increasing potential energy.

At ascending,

Increasing kinetic energy.

At the peak,

Greatest potential energy.

At the descending,

Greatest kinetic energy.

Answer:

The answer is true. Hope this helps!

Answer:

Characterization is the process by which the writer reveals the personality of a character. Characterization is revealed through direct characterization and indirect characterization. Direct Characterization tells the audience what the personality of the character is.

Answer:

After 3 seconds, the velocity is 4.5+3×1.5=9 m/s.

The greatest acceleration that the elevators motor can produce without breaking the cable is 5 m/s².

The given parameters;

The total mass the elevator can support;

M = 500 kg + 20(75 kg)

M = 2000 kg

The greatest acceleration that the elevators motor can produce without breaking the cable occurs when the elevator is moving upwards;

T = M(a + g)

[tex]2.96 \times 10^4 = 2000 (a + 9.8)\\\\2.96 \times 10^4 = 2000a + 19600\\\\29600 - 19600 = 2000a\\\\10,000 = 2000a\\\\a = \frac{10,000}{2000} \\\\a = 5 \ m/s^2[/tex]

Thus, the greatest acceleration that the elevators motor can produce without breaking the cable is 5 m/s².

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Answer:

Avg speed

[tex] \frac{dp}{dt } = \frac{5 - 4}{12 - 0} = \frac{1}{12} m \: per \: s[/tex]

avg velocity

[tex] \frac{5}{4} m \: per \: s[/tex]

Hi there!

Average speed = Distance / time

From the previous question, distance = 17m, so:

Speed = 17/12 ≈ 1.417 m/s

Average velocity = DISPLACEMENT/ time

Displacement = 1m, so:

Average velocity = 1/12 ≈ 0.083 m/s

Answer:

False

Explanation:

You could weigh less on the moon then on Earth because the moon has a smaller gravitational force compared to Earth.

Answer:

Below

Explanation:

To find the frequency of a wave you can use this formula :

     f = v / λ

     f = 340m/s / 0.5m

     f = 680 Hz

Hope this helps!