What is the efficiency of a 10 hp DC motor that draws 31 amps at 300 volts?

Answer:

Explanation:

The force acting on an object given the mass and acceleration we use the formula

We have

force = 15 × 20

We have the final answer as

Hope this helps you

Answer:

Radio waves

Explanation:

I hope it helps u dear^_^

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The electromagnetic waves with the longest wavelength are radio waves .

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Hope it helps!

Error is the difference between actual value and the calculated value.

Uncertanity of a measured value in an interval around that value such that any repetition of measurement will produce a new result that lies within the interval.

Hence, error and uncertanity are interchangeable words that describes the same concept.

Answer:

An article written by a scientist .

Explanation:

Primary sources information are those that contain first  hand information probably from the place of the activities or by the original contact of the information (source ) .

So primary information is normally contained in artifact , journals , letter , dissertations manuscripts  , videos and audio recordings .

The fact that the article is written by the scientist means he is the one who has the original information hence he is the first person to access the information , meaning he is the original owner .

A. the frequency of the wave

8.29×10⁸ Hz

B. the magnetic-field amplitude.

= 2.07 x 10⁻¹⁰ T

C. intensity of the wave

I = 1.08×10⁻¹⁶ W/m²

A) The frequency of an electromagnetic wave can be calculated using the equation

c = λf

where

c is the speed of light in a vacuum

λ is the wavelength and

f is the frequency.

Substituting the values

c = 3.00×10^8 m/s (speed of light in a vacuum)

λ = 36.2 cm = 0.362 m (wavelength)

f = c/λ

f = (3.00×10⁸)/(0.362 m)

f = 8.29×10⁸ Hz

B. the magnetic-field amplitude.

= E/c

= (6.20 x 10⁻² ) / (3 x 10⁸ )

= 2.07 x 10⁻¹⁰ T

C) The intensity of an electromagnetic wave

I = (cε/2) E²

where

I is the intensity

c is the speed of light in a vacuum

ε is the electric constant = 8.85×10⁻¹² F/m

E is the electric-field amplitude = 6.20×10⁻² V/m

Substituting the values given in the problem

I = (cε/2) E²

I = ((3 × 10⁸ m/s × 8.85 × 10⁻¹²) /2) (6.20×10⁻²)²

I = 1.08×10⁻¹⁶ W/m²

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Answer:

hai >.<

Explanation:

Answer:

hello!

Explanation:

~evita

Answer:

80/1

Explanation:

to figure out the answer of how many miles/meters per second divide the meters/miles by the second

so 400÷5 would be 80

80 meters per second

hope this helps :))

The vertical vector component of a ball kicked at an angle of 58 degrees with an initial velocity of 82 feet per second is 57.568 feet per second.

The vertical vector component is found by multiplying the initial velocity by the sine of the angle of inclination.

In this case, the sine of 58 degrees is 0.814155, so the vertical vector component is

82 * 0.814155 = 57.568 feet per second.

The vertical vector component represents the velocity of the ball in the vertical direction.

As the ball travels through the air, the vertical vector component will decrease due to the force of gravity.

However, the horizontal vector component will remain constant.

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Answer:

Explanation:

B

Answer: B.It uses a renewable resources

Explanation:

Answer:

last one.Condution and convection are equzlly efficentmethods of heat transfer.

Explanation:

Answer: B convection is a more efficient method of heat transfer  

Explanation:

Two blocks, \(m_1\) and \(m_2\), are connected by a spring and placed on a frictionless surface. The compression force for the spring in terms of F is (2/3) * F

To draw the free body diagram for both blocks, consider the forces acting on each block individually. Block \(m_1\) experiences the applied force F and the tension in the spring (T). Block \(m_2\) experiences only the tension in the spring (T). Since the surface is frictionless, there is no friction force acting on either block.

Now, determine the relationship between the forces acting on the blocks. Since both blocks accelerate together, the net force acting on them must be the same. The net force on m1 is F - T, and the net force on \(m_2\) is T. Since they have the same acceleration, can equate their net forces:

F - T = T

Simplifying this equation,

F = 2T

Since \(m_2\)'s mass is only a third of \(m_1\), the equation is:

\(m_2 = (1/3) * m_1\)

Substituting this into the equation for T, solve for T:

F = 2T

\(F = 2 * (m_2/m_1) * T\)

F = (2/3) * T

Therefore, the compression force for the spring in terms of F is (2/3) * F.

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Answer: cool things

Explanation:

Answer:

Unlike protons, electrons can move from atom to atom. If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.

Explanation:

The voltage at the inverting terminal is 7.5 V. V out is -12.5 V. The current flowing through R4 is 0.5 mA.

Given that Vn, Vout, and lout for the circuit shown below and op amp is ideal.In the circuit, current I2 flows through the 2.5 kΩ resistor.

Therefore, the voltage drop across the 2.5 kΩ resistor is given by,

Vn = I2 x R2Vn = 3 mA x 2.5 kΩ = 7.5 V

Therefore, the voltage at the inverting terminal is 7.5 V.

Since op-amp is assumed to be ideal, no current flows into the inverting and non-inverting terminals.

Therefore, current through R3 is given by,

I3 = (Vn - Vout) / R3=> Vout = Vn - I3 x R3=> Vout = 7.5 V - 4 mA x 5 kΩ=> Vout = - 12.5 V

Therefore, Vout is -12.5 V.

Let's calculate the current flowing through R4:

This current will also flow through the 5 kΩ resistor.

Let lout be the current flowing through R4.

Therefore, current through the 5 kΩ resistor is also lout.

Now, I4 + lout = I3=> I4 = I3 - lout=> I4 = 4 mA - lout

Also, I4 = (5 V - Vout) / R4=> 4 mA - lout = (5 V - (-12.5 V)) / 5 kΩ=> 4 mA - lout = 3.5 mA=> lout = 0.5 mA

Therefore, lout is 0.5 mA.

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Answer:

An open system.

Explanation:

An isolated system allows the exchange of neither energy nor matter with the surroundings. A closed system allows the exchange of energy, but not matter. An open system allows the exchange of both energy and matter.

Notice that in this question, light (electromagnetic wave) is a form of energy. The entry and exit of light allows this system to exchange energy with its surroundings- just as how the earth receives energy from the sun. Additionally, this system could exchange energy with its surroundings through the exchange of matter (in particular, air) with its surroundings.

Thus, the system in this question is an open system.

Answer: 1.5 × 10^-17

Explanation:

Given the following :

Frequency(f) = 2.2 × 10^16 Hz

Planck's constant(h) = 6.63 × 10^-34

The energy of a photon 'E' is given as the product of frequency and the planck's constant

E = hf

E = (6.63 × 10^-34) × (2.2 × 10^16)

E = 6.63 × 2.2 × 10^(-34 +16)

E = 14.586 × 10^-18

E = 1.4586 × 10^-17

E = 1.5 × 10-17 (2 S. F)

Answer:

C. 1.5 × 10–16 J

Explanation:

The maximum height reached by the apple thrown with an initial velocity of 8.50 m / s at 72° is 6.65 m

H = u² sin²θ / g

H = Maximum height

u = Initial velocity

g = Acceleration due to gravity

u = 8.5 m / s

g = 9.8 m / s²

θ = 72°

H = 8.5² sin² ( 72° ) / 9.8

H = 72.25 * 0.9 / 9.8

H = 6.65 m

If an object is thrown with an initial velocity at angle with the ground, it will move in a projectile motion. The object thrown is called as a projectile.

Therefore, the maximum height reached by the apple is 6.65 m

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Given,

The weight, W = 190 N

The height, H = 45 m

The potential energy is calculated by the formula,

Calculate the potential energy by substituting the given values.

Thus, the potential energy is 8,550 Joules.

Together, the two cars are traveling at a speed of 29.11 m/s.

As a result,

The car's mass is 1 m = 1250 kg.

Initially, the car's speed was 1, u = 32 m/s.

Car 2 mass, m' = 875 kg

The starting speed of vehicle 2 is 25 m/s.

both vehicles stick together. An inelastic collision is a situation here. The pace is maintained. Let V be the combined speed of the two vehicles.

Using conV = 29.11 m/s, it is determined.

Thus, the combined speed of the two cars is 29.11 m/s. Therefore, this is the necessary solution. momentum preservation as:

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Answer:

I think the answer is D.)

Explanation:

If it means something needs to melt into liquid i would have gone with B.) or C.) but since it doesn't specifiy. I thought D.) since all you have to do is heat it and it melts or boils.

An object's mass, rather than its weight is used to indicate the amount of matter it contains because weight is defined as the amount of force due to an existing field (In most cases, gravitational field) that is experienced by the body. The weight of the same body can be different in different environments it's observed.

However, the mass of the body is the exact measure of the amount of matter contained in a body. Which is constant, regardless of the environment, or conditions the body is observed.

Hence, for real-world calculations and experimentation, the mass of the body is considered to represent the amount of matter it contains rather than its weight.

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Answer:

A. Forming a Hypothesis

Answer: C I think

Explanation:

Answer:

C. Semiconductors and conductors

Explanation:

this is because conductors let electrons flow through them and semiconductors only in some conditions

A. The period of vibration is the time it takes for one complete oscillation to occur. It is the reciprocal of the frequency. The period of vibration can be calculated using the formula:

Period = 1/Frequency

Given that the frequency of vibration is 5.0Hz, the period of vibration is:

Period = 1/5.0 s

Period = 0.2 s

B. If the cart's mass is doubled while the spring constant remains unchanged, the frequency of vibration will not change. This is because frequency is dependent on the spring constant and the mass of the cart and not on the amplitude of the oscillation.

C. If the spring constant doubles while the cart's mass remains the same, the frequency of vibration will also double. This is because frequency is directly proportional to the square root of the spring constant. Therefore, doubling the spring constant would lead to an increase in the frequency of vibration by a factor of square root of 2.

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I think its "a dropped penny sinks at the bottom of a pond". Because, non-contact force is a force that you don't touch, like gravity or weight, that falls but you didn't drop it on purpose nature did or gravity itself did.

Answer:

v = v +at = 22 + (1.6 6.8 s  ms) = 33 ms

Explanation:

Answer:

Although the Earth has a lesser mass than the Sun, it is far closer to you, allowing for a stronger pull.

Explanation:

Answer:

From Savos point of view, Gadros appear not to be moving

Explanation:

The given parameters are;

The distance between Godric and Savos = A few meters

The location of Godric and Savos = One end of the field

The location pf Peter = The other end pf the field

The speed with which Godric and Savos are moving towards Peter = 4 m/s

Let the positive x-direction be the direction in which Godric and Savos are moving

Therefore;

The speed and direction with which Godric is moving = The speed and direction with which Savos is moving = 4·i m/s

From Savos point of view, the relative speed with which Godric is moving = (The speed and direction in which Godric is moving) - (The speed and direction in which Savos is moving) = 4·i m/s - 4·i m/s = 0 m/s

Therefore, from Savos point of view, the relative speed with which Godric is moving = 0 m/s or Gadros appears stationary or not to moving.

Answer:

100m/s

Explanation:

speed of wave=frequency × wave length

=10 × 10

=100m/s

Answer:

100 m/s

Explanation:

Formula :

Solving using the given values :

The direction of the current when the north pole of the coil is facing the north pole of the magnet, according to Lenz's Law, will be counterclockwise. Lenz's Law states that the direction of an induced current in a conductor is always such that it opposes the change in magnetic field that caused it.


According to Lenz's Law, the direction of the induced current in a coil or circuit will be such that it opposes the change in magnetic field that is causing it.

When the north pole of a magnet is brought near the north pole of a coil, the magnetic field in the vicinity of the coil will increase. To oppose this increase, Lenz's Law states that the induced current will flow in such a direction that it produces a magnetic field that opposes the magnetic field of the approaching magnet.

Using the right-hand rule for the direction of induced current, if you extend your right hand with the thumb pointing in the direction of the approaching magnetic field (from the north pole of the magnet towards the north pole of the coil), then the curled fingers will indicate the direction of the induced current. In this case, the induced current will flow counterclockwise around the coil when viewed from above.

Therefore, the direction of the current when the north pole of the coil is facing the north pole of the magnet, according to Lenz's Law, will be counterclockwise.


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