Under normal conditions, what color do we expect diamonds to be?​

Answer:

friction reduces the efficiency of machines, thus we must reduce the friction force that is acting upon it.

Answer:

Because it causes a lot of wear and tear in machine parts that move against each other. It erodes the surfaces and destroys their symmetries

Explanation:

The normal force exerted by the seat of the chair on the person when he passes through the highest point is 1,040 N.

The normal force exerted by the seat of the chair on the person when he passes through the highest point is calculated as;

Fn = ma - W

where;

The centripetal acceleration is calculated as follows;

a = v² / r

a = ( 10² ) / 5

a = 20 m/s²

The mass of the person is calculated as follows;

m = W / g

m = 1000 / 9.8

m = 102 kg

Fn = ma - W

Fn = ( 102 x 20) N  -  1000 N

Fn = 1,040 N

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Answer:

current must flow and chemical energy must take place

The initial velocity of the train is 20m/s when the train decelerates uniformly at a rate of 2m/s2. It means that initially, at time = 0 seconds, the train was moving with a velocity of 20m/s.

We know that,

v = u +at

where, v = final velocity

u = initial velocity

a = acceleration

t = time taken

In this case, as the train is decelerating we will use a negative sign with acceleration.

Substituting the values we get,

v = u + (-2)(10)

v will be equal to zero, as the train comes to a stop.

0 = u - 20

u = 20 m/s

Hence, the initial velocity of the train is 20m/s when the train decelerates uniformly at a rate of 2m/s2 and comes to a stop in 10 seconds.

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Answer:

Its b

Explanation:

I just did this question

The question that can be answered by scientific investigation is that can be answered by gathering  data during an experiment. Thus option B is correct.

Investigation on a natural phenomenon or process to solve a scientific question or to solve a social or environmental issue by well designed experiments based on reasonable observations is called scientific investigation.

A scientific investigation includes, variables, hypothesis , observations, research  methodology. Scientific experiments have to well designed to address all the outcomes of the observations and  must be feasible to prove whether the hypothesis is true or not.

Scientific investigations cannot be conducted based on only opinions from scientists or scientific record. The data have to be collected through experiments conducted by well designed research methodology.

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Room heater. The electric current's magnetic action is not the foundation of the space heater. Devices that depend on the magnetic effect of electric current to work include the magnetic crane, , and loudspeaker.

The magnetic crane creates a magnetic field that can lift large things using an electromagnet. The magnetic field produced by the electric bell's usage of an electromagnet forces a metal clapper to strike a bell, emitting a ringing sound. An electromagnet in the loudspeaker causes a diaphragm to vibrate, creating sound waves that can be perceived by the human ear. In contrast, the usual mechanism of a room heater is the use of a resistor or heating element to transform electrical energy into heat energy. After that, the heat is radiated or convected.

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Wavelength is defined by Velocity of the wave by Frequency

Symbolically

\(\\ \ast\bull\rm\longmapsto \lambda=\dfrac{c}{v}\)

Answer:

In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.

An  example of diffraction is being able to hear sounds from outside a room throughout the whole room.

The term diffraction has to do with the bending of waves around an obstacle which causes the waves to spread out as they emerge on the other side.

One typical example of diffraction is being able to hear sounds from outside a room throughout the whole room.

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(A) The two additional forces that act on the sled as it travels from the top of the hill to the bottom are friction force and weight of the children.

(B) The force of friction is opposing the motion while the weight of the children is assisting the downward motion.

The forces that act on the sled as it travels from the top of the hill to the bottom with either aid the downward motion or oppose the downward motion.

The forces acting on the sled include the following;

The weight of the children is acting downwards and it will increase the motion downwards since there in the same direction.

The force of friction between the surface of the sled and the hill will oppose the downward motion of the children as the father exerts the downward force.

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a) The rms current is 0.52A.

b) The Voltage-to-current ratio is 4.17 and effective resistance is 5.99 Ω.

c)  The effective resistance is 5.99 Ω.

a. To find the rms current in the series RLC circuit, we need to calculate the impedance of the circuit first using the formula Z = sqrt(R² + (XL - XC)²), where R is the resistance, XL is the inductive reactance, and XC is the capacitive reactance.

Using the given values, we can calculate the impedance as:

XL = ωL = 2πfL = 2π(60 Hz)(25 mH) = 9.42 Ω

XC = 1/(ωC) = 1/(2πfC) = 1/(2π(60 Hz)(18 μF)) = 147.2 Ω

Z = sqrt((260 Ω)² + (9.42 Ω - 147.2 Ω)²) = 231.4 Ω

Now, we can find the rms current using Ohm's law, I = V/Z, where V is the voltage supplied by the wall outlet (120 V):

I = 120 V / 231.4 Ω = 0.52 A (rounded to two significant figures)

b. The effective resistance of the transformer can be found using the formula R_eff = V_secondary / I_secondary, where V_secondary is the voltage at the secondary and I_secondary is the current through the load connected to the secondary.

We are given that the secondary voltage is 25 V and the load resistance is 6.0 Ω. To find the current through the load, we can use Ohm's law:

I_secondary = V_secondary / R_load = 25 V / 6.0 Ω = 4.17 A

Now we can calculate the effective resistance of the transformer as:

R_eff = V_secondary / I_secondary = 25 V / 4.17 A = 5.99 Ω (rounded to two significant figures)

c. The effective resistance of the transformer when connected to the given load is approximately 5.99 Ω.

This value represents the equivalent resistance that would produce the same voltage-to-current ratio as the transformer, which depends on the turns ratio between the primary and secondary coils.

This effective resistance is important for calculating the power delivered to the load, as well as for designing and analyzing electrical systems that use transformers.

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Using a cable with a tension of 1350 N , a tow truck pulls a car 5.00 km alone a horizontal roadway. Therefore,

(a) Cable work: 6,750,000 J horizontally.

(b) Cable work: 6,308,250 J at 35.0° above horizontal.

(c) No work by gravity.

To calculate the work done by the cable in each scenario, we need to consider the angle between the direction of the force applied and the displacement.

(a) If the cable pulls horizontally (0° above the horizontal):

In this case, the angle between the force and the displacement is 0 degrees, so the work done can be calculated as:

Work = Force * Displacement * cos(Ф)

Work = 1350 N * 5000 m * cos(0°)

Work = 1350 N * 5000 m * 1

Work = 6,750,000 J

The cable does 6,750,000 Joules of work on the car when it pulls horizontally.

(b) If the cable pulls at 35.0 degrees above the horizontal:

In this case, the angle between the force and the displacement is 35.0 degrees, so the work done can be calculated as:

Work = Force * Displacement * cos(Ф)

Work = 1350 N * 5000 m * cos(35.0°)

Work = 1350 N * 5000 m * 0.819

Work = 6,308,250 J

The cable does approximately 6,308,250 Joules of work on the car when it pulls at 35.0 degrees above the horizontal.

(c) The work done by gravity on the car is zero because gravity acts vertically downward, perpendicular to the displacement along the horizontal roadway. Therefore, the gravitational force does not contribute to the work done on the car in this scenario.

In both cases (a) and (b), the cable does the same amount of work on the tow truck as on the car since they are connected by the cable. So the work done by the cable on the tow truck would be equal to the values calculated above: 6,750,000 J in case (a) and 6,308,250 J in case (b).

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Answer:

1)  10 kg-m/s

2)  2 kg

3)  20 m/s

Explanation:

The momentum of an object can be calculated using the equation:

\(\large\boxed{p=mv}\)

where:

\(\hrulefill\)

For this question we need to find the momentum of a bowling ball whose mass is 4.0 kg is rolling at a rate of 2.5 m/s.

Given values:

Substitute the given values into the momentum formula and solve for p:

\(p=4.0\;\text{kg} \cdot 2.5\;\text{m/s}\)

\(p=10\;\text{kg m/s}\)

Therefore, the momentum of the bowling ball is 10 kg-m/s.

\(\hrulefill\)

For this question we need to find the mass of a skateboard rolling at a velocity of 3.0 m/s with a momentum of 6.0 kg-m/s.

Given values:

As we want to find mass, rearrange the momentum formula to isolate m:

\(\large\boxed{m=\dfrac{p}{v}}\)

Substitute the given values into the formula and solve for m:

\(m=\dfrac{6.0\; \text{kg m/s}}{3.0\; \text{m/s}}\)

\(m=2\;\text{kg}\)

Therefore, the mass of the skateboard is 2 kg.

\(\hrulefill\)

For this question we need to find the velocity of a baseball with a mass of 0.5 kg and a momentum of 10 kg-m/s.

Given values:

As we want to find velocity, rearrange the momentum formula to isolate v:

\(\large\boxed{v=\dfrac{p}{m}}\)

Substitute the given values into the formula and solve for v:

\(v=\dfrac{10\; \text{kg m/s}}{0.5\; \text{kg}}\)

\(v=20\;\text{m/s}\)

Therefore, the velocity of the baseball is 20 m/s.

Answer:

5Hz

Explanation:

Frequency = No. of waves per second

10 waves are produced in 2 seconds

in one second 10/2 waves are produced

(ie) 5 waves are produced in 1 second

Therefore the frequency of wave is 5 Hz

The centripetal acceleration of the object is 4 m/s^2.The centripetal acceleration of an object undergoing uniform circular motion can be calculated using the formula:

centripetal acceleration = (velocity^2) / radius

In this case, we are given the radius of the circular motion as 5.67 m and the period (time taken to complete one full revolution) as 3.25 sec. To find the velocity, we can use the equation:

velocity = (2 * π * radius) / period

Substituting the given values, we get:

velocity = (2 * 3.14 * 5.67) / 3.25 = 11.38 m/s

Now, we can calculate the centripetal acceleration using the formula mentioned earlier:

centripetal acceleration = (11.38^2) / 5.67 = 22.76 / 5.67 = 4 m/s^2

Therefore, the centripetal acceleration of the object is 4 m/s^2.

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The centripetal acceleration of the object is 4 m/s^2.The centripetal acceleration of an object undergoing uniform circular motion can be calculated using the formula:

centripetal acceleration = (velocity^2) / radius

In this case, we are given the radius of the circular motion as 5.67 m and the period (time taken to complete one full revolution) as 3.25 sec. To find the velocity, we can use the equation:

velocity = (2 * π * radius) / period

Substituting the given values, we get:

velocity = (2 * 3.14 * 5.67) / 3.25 = 11.38 m/s

Now, we can calculate the centripetal acceleration using the formula mentioned earlier:

centripetal acceleration = (11.38^2) / 5.67 = 22.76 / 5.67 = 4 m/s^2

Therefore, the centripetal acceleration of the object is 4 m/s^2.

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Answer:

A. 50 W

Explanation:

Power = work / time

P = 500 J / 10 s

P = 50 W

The mass given is 25.0 grams. As for the change in temperature, I will assume that it start off at room temperature, 25°C.

Maxwell's equations describe the behavior of electromagnetic waves. In this particular electromagnetic field, we can see that the electric field (E) and magnetic field (B) are perpendicular to each other and both vary sinusoidally with time and distance.

To show that this field satisfies Maxwell's equations, we need to confirm that it satisfies the wave equation.
The wave equation relates the second derivative of the electric field with respect to distance (x) to the second derivative of the electric field with respect to time (t), and similarly for the magnetic field. When we apply the wave equation to this field, we find that w^2 = c^2k^2, where w is the angular frequency and c is the speed of light.

This relationship between w and k is known as the dispersion relation and it ensures that this particular electromagnetic field satisfies Maxwell's equations. In summary, the electromagnetic field given by (9.64) can satisfy Maxwell's equations if the angular frequency (w) and wave number (k) are related through the dispersion relation w^2 = c^2k^2.

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The initial temperature of the water, the heat source, and the volume of water being boiled are some of the variables that affect how long it takes to boil water.

4.18 J/g/°C is the specific heat capacity of water. What we are interested in is the quantity of heat, or Q. To do this, we would apply the formula Q = m•C•T. The m, C, and T can be calculated using the initial and final temperatures.

How much heat is gained or lost by a sample can be calculated using the equation q = mcT, where m is the mass of the sample, c is the T represents the change in temperature, while S is specific heat (q).

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The given statement "In general, as a reaction proceeds to make more products, reaction rate decreases" is true.

This is because as the concentration of reactants decreases, there are fewer collisions between particles, leading to a slower rate of reaction. Additionally, some reactions may also be limited by factors such as the availability of reactants or the presence of catalysts.

However, there are some reactions where the opposite may be true, such as in a chain reaction where the formation of one product can trigger the formation of more products, leading to an increase in reaction rate.

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Answer:

vitamins don't contain calories

A 60 g ball of clay traveling at speed 6.5 m/s m / s hits and sticks to a 1.0 kg k g block sitting at rest on a frictionless surface. The speed of the block after the collision is approximately 0.368 m/s.

After the collision, the speed of the block can be found using the conservation of momentum principle.

The initial momentum of the system is equal to the final momentum of the system.

Initial momentum = (mass of clay * velocity of clay) + (mass of block * velocity of block)

Final momentum = (mass of clay + mass of block) * final velocity
60 g = 0.06 kg (convert to kg)
1.0 kg block is at rest, so its initial velocity = 0 m/s.

Initial momentum = (0.06 kg * 6.5 m/s) + (1.0 kg * 0 m/s) = 0.39 kg m/s
Final momentum = (0.06 kg + 1.0 kg) * final velocity
Since, Initial momentum = Final momentum, we have

0.39 kg m/s = (1.06 kg) * final velocity
Final velocity = 0.39 kg m/s / 1.06 kg

Final velocity  ≈ 0.368 m/s

The speed of the block after the collision is approximately 0.368 m/s.

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When a force is applied to an object, it can cause a change in the object's motion or state of rest.

If the force is unbalanced, it can cause the object to accelerate or decelerate, resulting in a change in speed or direction. The effect of the applied force depends on the mass and nature of the object, as well as the magnitude and direction of the force. Additionally, the object may experience other effects, such as deformation or compression, depending on the type and direction of the force applied. Understanding the effects of applied forces is crucial in fields such as engineering, physics, and mechanics.

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--The complete question is, When force is Applied  on an object describe effect of action applied. --

To obtain the required 8400 kj of energy per day, one would need to consume approximately 18.53 pounds of carbohydrates at 16.74 Kj/g.

To determine the number of pounds of carbohydrates needed to obtain 8400 kj of energy per day, we can use the conversion factor of 16.74 Kj/g.

First, we need to convert 8400 kj to grams. Since 1 kj is equal to 1 gram, 8400 kj is equal to 8400 grams.

Next, we can convert grams to pounds. There are 453.592 grams in a pound, so dividing 8400 grams by 453.592 gives us approximately 18.53 pounds.

Therefore, to obtain 8400 kj of energy per day, one would need to consume approximately 18.53 pounds of carbohydrates.

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Answer:

gracias

Explanation:

Hello.

Brainly points can be used for better situations, brainly points are experience that you receive by answering well.

Answer:

Explanation:

i think this will help

Explanation: Research highlights the individuals with ASDS are nutritionally vulnerable because they exhibit a selective or pick eating pattern and sensory sensitivity that predisposes them to restricted intakes.

I hope this helps!

The stunt coordinator needs to collect a variety of measurements in order to determine if the car will hit its target or not. He needs the height of the cliff, the mass of the car, and the speed of the car.

Correct option is 2.

These measurements are essential in order to accurately calculate the trajectory of the car when it is dropped from the cliff. The car's mass will affect its speed, while the speed will affect how far the car can travel. The height of the cliff will determine the starting point of the car's trajectory and the amount of time it will take for the car to reach the bottom.

If any of these measurements are incorrect, the stunt coordinator will not be able to accurately predict the path that the car will take. Therefore, it is necessary for the stunt coordinator to collect all of these measurements in order to know if the car will hit its target.

Correct option is 2.

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The stunt coordinator needs more measurements besides just the speed of the car, the mass of the car, and the height of the cliff. These factors also include the angle of launch, the trajectory of the stunt and various environmental factors.

The question involves understanding whether the stunt coordinator has collected all necessary measurements. The answer is 4) No, he needs to collect more measurements. Understanding whether a car will hit its target in a stunt involves various factors: the speed of the car, the angle of launch, the mass of the car, the height of the cliff, the trajectory of the stunt, and environmental factors like air resistance and wind. It's not just about the height of the cliff and the mass of the car or just the speed of the car. Therefore, more measurements and considerations are necessary to ensure the stunt's success.

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