An electric motor delivers a shaft torque of 15 lb. ft at 1800 rpm. what is the motor power?

Answer:

A disturbance or vibration in matter

Explanation:

Answer:

A mechanical wave is a distance in matter that transfer energy through the matter. A mechanical wave starts when matter is disturbed. A source of energy is needed to disturb matter and start a mechanical wave.

Answer:

Your answer is C~

Explanation:

It takes the ball 3.06 seconds to reach its highest point

The time it takes for a ball to reach its highest point is given by the equation:

t = v / g

where

In this case, the initial velocity is 30.0 m/s and the acceleration due to gravity is \(9.8 m/s^2\). Therefore, the time it takes for the ball to reach its highest point is:

\(t = 30.0 m/s / 9.8 m/s^2 = 3.06 s\)

Therefore, it takes the ball 3.06 seconds to reach its highest point.

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The type of circuit does this traffic situation model will be a parallel circuit because there is more than one path.

A parallel circuit has branches that split the current such that just a portion of it passes through each branch.

The voltage or potential difference between each branch of a parallel circuit is the same, but the currents might differ.

A parallel circuit is having more than one path in order to reach it on time he has to take a different path.

Hence the type of circuit does this traffic situation model will be a parallel circuit because there is more than one path.

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Answer:

C) a parallel circuit because there is more than one path

Explanation: edge

The dew point, at which the relative humidity (RH) reaches 100%, can be determined from the given RH and temperature.

a) To determine the dew point, we need to find the temperature at which the air reaches 100% RH. This occurs when the air is cooled down to a temperature where it can no longer hold all the moisture, resulting in condensation.

b) The size of CCNs activated into cloud droplets depends on the supersaturation level, which is determined by the temperature. As the air is cooled to 7 °C, the supersaturation increases, leading to the activation of insoluble CCNs into cloud droplets. The exact size of the CCNs cannot be determined without more information.

c) The activation of CCNs into cloud droplets depends on their critical supersaturation, which is related to their size. Smaller CCNs (50 nm) have a higher critical supersaturation and are more likely to be activated into cloud droplets compared to larger CCNs (200 nm). This is because smaller CCNs require less supersaturation to reach the critical threshold for activation, while larger CCNs require higher supersaturation levels

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To produce thermal effects, microwave energy is converted to heat in the body or organism.

The answer is d. heat.

Microwave energy, like all forms of electromagnetic radiation, can interact with matter and be absorbed, which can result in the production of heat. In the context of the human body, this heat can cause thermal effects such as tissue damage or changes in cellular metabolism.

When microwave energy is absorbed by matter, it can cause the molecules in that matter to vibrate and generate heat. This is because the energy of the microwaves is converted into kinetic energy of the molecules.

In the human body, certain tissues may absorb more microwave energy than others, depending on their composition and density. For example, the eyes and testes are particularly sensitive to microwave radiation because they contain fluids that can absorb this energy.

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The amount of force needed by the truck to move the boulder is 200 N.

This can be defined as the product of mass and acceleration. The S.I unit of force is Newton or kgm/s²

To calculate the newton's of force a block needs to move, we use the formula below.

Formula:

Where:

Make F the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, the amount of force needed by the truck to move the boulder is 200 N.

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Answer:

True

Explanation:

Mitosis is the process of cell division that produces two identical daughter cells. Occasionally mutations can occur during DNA replication or the other stages of mitosis. However, cells have mechanisms for DNA repair that can correct these mutations, ensuring the integrity of the genetic material.

The false statement is Affect algebraic equations for boundary nodes only. Therefore the correct option is option B.

The values of the fluxes or gradients of the solution variable at the boundary are often included in natural boundary conditions, which are conditions that are stated on the boundaries of a domain.

Due to the fact that these conditions affect the behaviour of the solution across the entire domain and not only at the boundary nodes, they can have an impact on both the stiffness matrix [K] and the force vector [f].

Natural boundary conditions are frequently imposed in finite element analysis through the use of numerical integration techniques, which translate the boundary conditions into equivalent equations that are incorporated into the larger system of equations being solved.

Therefore, the system of equations as a whole, and not simply the equations linked to the boundary nodes, can be affected by natural boundary conditions. Therefore the correct option is option B.

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At horizontal angles, relative to the original direction of the waves, will be  1.4597 rad and the intensity will be 1.576 W/m².

A radar antenna is a device that sends out radio waves and listens for their reflections. The ability of an antenna to identify the exact direction in which an item is placed determines its performance.

The horizontal angle for the given condition is;

sinθ∝1

sinθ=(nλ)/a

n∝(λ/a)

\(\rm n = \frac{88.9 \times 10^6 \times 15}{3 \times 10^8 } \\\\ n=4.4454\)

\(\rm n_{max}=4\)

The maximum angle is;

\(\rm \theta_4=\frac{4 \times 3 \times 10^8}{15 \times 88.9 \times 10^6 } \\\\ \rm \theta_4=64.14^0\)

The value of the wavelength is;

\(\rm \lambda= \frac{c}{v} \\\\ \rm \lambda= \frac{3 \times 10^8 }{88.9 \times 10^6} \\\\ \lambda= 3.3745 \ m\)

The value of the intensity is;

\(\rm I= I_{max}[\frac{sin \frac{\beta}{2}}{\frac{\beta}{2}} ]\\\\ \frac{\beta}{2} =\frac{\pi}{4} (a sin\theta)\\\\ \beta=\frac{\pi}{3.3745} (15 sin 6^0)\\\\ \beta=1.4597 \ rad\)

\(\rm I = 3.4[ \frac{sin 1.4597}{1.4597} ]^2\\\\ I=1.576 \ W/m^2\)

Hence,at horizontal angles, relative to the original direction of the waves, will be  1.4597 rad and the intensity will be 1.576 W/m².

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Answer:

\(6\:\mathrm{m/s}\)

Explanation:

Denote average speed by \(S=\frac{d}{t}\) where \(d\) is total distance travelled and \(t\) is time.

Plugging in given values, we get:

\(S=\frac{30}{5}=\fbox{$6\:\mathrm{m/s}$}\).

Answer:

s

Explanation:

Answer:

Grounded ( neutral)

Explanation:

In electrical works there are usually safety measures which needs to be specially adhered to.

We have to take into perspective the dangers associated with the open neutral (grounded conductor) which is the main treason why NEC 300.13(B) does not permit the continuity of the grounded(neutral) conductor to depend on a receptacle.

Answer:

2ms-2

Explanation:

F = ma

a = F/m

= 0.5 / 0.25

= 2ms-2

Answer 2m/s^2

Explanation:

mass=0.25kg

Force =0.5N

Acceleration=force/ mass

Acceleration=0.5/0.25

Acceleration=2

Acceleration =2m/s^2

The error in the biceps force is determined from the ratio of the precision of the mass measurement and actual mass measurement.

The error obtained in the measurement of the bicep force is determined from the precision measurement of the masses, since the product of mass and acceleration gives the force applied to the biceps.

F = ma = mg

where;

Error percent = (precision/measured mass) x 100%

Error percent = (0.1/50) x 100% = 0.2%

Error percent = (0.1/100) x 100% = 0.1%

Error percent = (0.1/200) x 100% = 0.05%

Error percent = (0.1/500) x 100% = 0.02%

Thus, the error in the biceps force is determined from the ratio of the precision of the mass measurement and actual mass measurement.

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A leftward force of 50 N is applied to an 8 kg object to move it across a rough surface with a leftward acceleration of 5 \(m/s^{2}\) , its

gravitational force = 78.4 N

normal force = 78.4 N

frictional force = 10 N rightward

net force =  40 N leftward

coefficient of friction = 0.128

given

force = 50 N

mass = 8 kg

acceleration = 5 \(m/s^{2}\)

gravitational force = mg = 8 * 9.8 = 78.4 N

normal force = mg = 78.4 N ( as N= mg )

- F (applied) + frictional force  = - F (net )

F (applied)  - fr = F (net )

50 - fr = mass * acceleration

50 - fr = 8 * 5

fr = 10 N

Fnet = ma = 8 * (-5) = -40 N

Frictional force = mu * N

10 = mu * 78.4

mu (coefficient of friction ) = 10 / 78.4 = 0.128

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Answer:

672000 J.

Explanation:

From the question,

q = cm(t₂-t₁)............................ Equation 1

Where q = heat energy supplied to the water, c = specific heat capacity of water, m = mass of water, t₂ = final temperature, t₁ = Initial temperature.

Given: m = 8.0 kg, c = 4200 J/kg°C, t₂ = 40°C, t₁ = 20°C

Substitute these values into equation 1

q = 8×4200×(40-20)

q = 8×4200×20

q = 672000 J.

Hence the energy suplied to the water is 672000 J.

Answer:

23481.78 W

Explanation:

The computation of number of watts of power is shown below:

M = 978 kg

V = 4.9 m/s

Theeta = 60°

As we know that  

 P = Fcos(theeta).V

F = Mg

P = (Mg)cos(theeta).V

P = 978×9.8×cos(60)×4.9

P = 23481.78 W

Answer:

- There was a constant acceleration at 0 to 10s

- There was a zero acceleration at 10 to 25s

- There was a constant deceleration at 25 to 30s

Explanation:

See attachment for complete question.

Solving (a): What happens at 0s to 10s

There was a constant acceleration and this is proven below.

At time 0, velocity = 15

At time 10, velocity = 30

This is represented as:

\((t_1,v_1) = (0,15)\)

\((t_2,v_2) = (10,30)\)

Acceleration (A) is the rate of change of velocity against time.

So:

\(A = \frac{v_2 - v_1}{t_2-t_1}\)

\(A = \frac{30-15}{10 - 0}\)

\(A = \frac{15}{10}\)

\(A = 1.5\)

Since the acceleration is positive, then it shows a constant acceleration.

Solving (b): What happens at 10s to 25s

There was a zero acceleration and this is because the velocity do not change.

See proof below

At time 10, velocity = 30

At time 25, velocity = 30

This is represented as:

\((t_1,v_1) = (10,30)\)

\((t_2,v_2) = (25,30)\)

Acceleration (A) is the rate of change of velocity against time.

So:

\(A = \frac{v_2 - v_1}{t_2-t_1}\)

\(A = \frac{30-30}{25 - 10}\)

\(A = \frac{0}{15}\)

\(A = 0\)

Solving (c): What happens at 25s to 30s

There was a constant deceleration and this is proven below.

At time 25, velocity = 30

At time 30, velocity = 0

This is represented as:

\((t_1,v_1) = (25,30)\)

\((t_2,v_2) = (30,0)\)

Acceleration (A) is the rate of change of velocity against time.

So:

\(A = \frac{v_2 - v_1}{t_2-t_1}\)

\(A = \frac{0-30}{30-25}\)

\(A = \frac{-30}{5}\)

\(A = -6\)

Since the acceleration is negative, then it shows a constant deceleration

Answer:The first is the magnitude of the force applied on the body and the second is the perpendicular distance from the line of action of force and the axis of rotation of the body.

Explanation:

The acceleration of the skateboarder is calculated out to bbe -2.33 m/s^2, when travelled at 7 meters per second.

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Answer:

Thus, even though the velocity of an object at rest must be zero, acceleration can clearly be non-zero for objects at rest. A particle that is thrown vertically upwards stops momentarily at the highest point of motion.

Answer:

Everything is zero. Because it's at rest.

Answer: runner B

Explanation:

i did the test

Runner which has the weakest force is A.

The speed of any moving object is the ratio of the distance covered and the time taken to cover that distance.

The image attached shows the times for runners in a 100 m dash.

Force = mass x Acceleration

Force = mass x Velocity /Time

If each runner has the same mass, runner with the maximum time has the weakest or lowest force.

Among all the four runners, Runner A has the highest time for completing 100 m dash.

Thus, Runner A has the weakest force.

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Answer:

close the door your letting the cold in

Answer:

trying to push a rock that never moves

Explanation:

let me try my best to break the concepts down for you.

the definition of work done is

work done by a constant force on an object is the product of the force and the distance moved by the object in the direction of the force.

this means that when you apply a force, it must move.

basically it is like holding a book in your hands and not moving, are you fighting the gravitational force?

when you push a box, it definitely moves in the direction you push right?

when you raise the barbel, you are applying a upward force, and barbel us moving upwards, so work is done

hope it helps, if not please report it so that someone else gets to try it

Answer:

23 grams

Explanation:

The atomic weight of sodium (Na) is approximately 23. Therefore, one mole of sodium atoms weighs approximately 23 grams.

Answer:

No not at all. A car speeding up is an example of acceleration.

Answer:

No.

Explanation:

Its a example of decceleration because its slowing down not speeding up. If the car were to go faster then it would be an example of acceleration. Hope this helps :)

Answer:

During winter time the northern hemisphere leans away from the sun due to the rotation of earth and due to this change the sunlight is not direct on these areas instead it is spread and due to this the shadows are longer and the sunlight is not intense. The earths rotation around the sun causes the seasons to change and that is why we experience shorter hours of daytime.

Explanation:

During winter time the northern hemisphere leans away from the sun due to the rotation of earth and due to this change the sunlight is not direct on these areas instead it is spread and due to this the shadows are longer and the sunlight is not intense. The earths rotation around the sun causes the seasons to change and that is why we experience shorter hours of daytime.