The reverse of the process of sublimation is called
a freezing.
b vaporization.
c deposition.
d condensation.
Science

Quality helps to distinguish the sound waves having same loudness and same pitch through the distinctive tone which is observed.

This is also referred to as timbre and is a feature which helps to distinguish sounds which have the same loudness. This means that the same loudness denotes the same amplitude while a similar pitch denotes the same frequency.

Quality is however the distinguishing factor it can be deciphered with the use of our sense of hearing which is ears and in the identification of sounds with such properties and is the reason why it was chosen as the correct choice.

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The net forces on the box acting perpendicular and parallel to the floor are

∑ F[perp] = F[normal] - 325 N + (475 N) sin(-35°) = 0

∑ F[perp] = (475 N) cos(-35°) - F[friction] = ma

where m is the mass of the box and a is its acceleration.

Solve for F[normal] :

F[normal] = 325 N + (475 N) sin(35°) ≈ 597 N

Then the frictional force has magnitude

F[friction] = 0.55 F[normal] ≈ 329 N

and so

60.5 N ≈ (325 N) a/g

(note that sin(-35°) = -sin(35°), cos(-35°) = cos(35°), and mg = 325 N so m = (325 N)/g)

Solve for a :

a = (60.5 N) / (325 N) g ≈ 1.82 m/s²

(a) Assuming this acceleration is constant, starting from rest, the box achieves a final velocity v such that

v² = 2a∆x

v² = 2 (1.82 m/s²) (5.80 m)

⇒   v ≈ 4.60 m/s

which happens in time t such that

v = at

4.60 m/s = (1.82 m/s²) t

⇒   t ≈ 0.177 s

(b) Let µ be the coefficient of static friction. The box just begins to slide if the magnitude of the parallel component of the applied force matches the magnitude of friction, i.e.

∑ F[para] = (475 N) cos(-35°) - F[friction] = 0

We have

F[friction] = µ F[normal] = (597 N) µ

so that

(597 N) µ = (475 N) cos(35°)

⇒   µ ≈ 0.651

Answer:

3820000000

Explanation:

Explanation:

the no of proton of an element is found in the inner part of the orbital of an element along with the neutron ,also knowing that this two add up to give mass no an element

where neutron+proton=mass no=nucleon no,where proton= electron, unless it carries charges call ion

Answer:

With regards to NASA's ambition to send humans to Mars, is an encouraging idea.  Also, the aim of sending food supply by unmanned spacecraft before the 2030 project though noble is filled with constraints and design problems.

For the constraints,

1. The spacecraft could be lost on the space before it reaches its destination being Mars. This is because, lack of communication between the control unit on earth and the spacecraft signify it being lost forever.

2. The food supply is bound to spoil on Mars since it would be stored unrefrigerated. This is as a result of the actions of the micro organisms acting on them.

For the criteria for the engineering design problem:

1. The distance between earth and Mars is very far

2. Not factoring in the preservation method into the unmanned aircraft.

Explanation:

Explanation:

The rate of consumption of electric energy in an electric appliance is called electric power. Hence, the rate at which energy is delivered by a current is the power of the appliance.

Answer: 2

Explanation:

Solve the given problem as

If you look at courage and if you look at the brain, there is one particular brain structure that plays a very important role when it comes to courage and your own performance. This part of the brain is called the amygdala. The amygdala is a brain structure that is very small, and we have two of them, one of the left side of the brain, one on the right side of the brain. They’re very small and look like an almond. Amygdala is also the Latin word for almond. Even though they are small, they amygdala is also extremely powerful. It plays a very important role in our survival. Whenever there is a real danger outside, it will trigger a fight, flight or freeze response, so you will fight danger, run away, or just be blocked in your own emotions, you will freeze, perhaps you will hide. The amygdala is very important for our survival and for many emotions in general, but in many situations, the amygdala will also become active when there is no real danger, for example, standing on stage and holding a presentation, leading a difficult conversation. These are two examples where there’s no real danger, but nevertheless, the amygdala can be triggered and cause this feeling of nervousness and anxiety. It’s these feelings of nervousness, anxiety or insecurity that will also block us in our potential to hold a presentation or to lead a good conversation.

The magnetic flux through the square loop at any time t is given by Φ = 0.009408t² Wb.

To find the magnetic flux through the square loop at any time t, we need to calculate the dot product of the magnetic field vector and the area vector of the loop.

Step 1: Calculate the area vector
The area of the square loop is A = L², where L is the side length.
A = 14cm × 14cm = 196cm² (convert this to m²)
A = 0.0196 m²

Since the loop lies in the xy-plane, the area vector is perpendicular to the plane, which is in the z-direction.
Area vector = A × k^ = (0.0196 × k^) m²

Step 2: Calculate the dot product
The magnetic field vector is B = (0.26ti^ + 0.48t²k^) T
The area vector is A = (0.0196k^) m²

Magnetic flux (Φ) is the dot product of B and A:
Φ = B . A = (0.26ti^ + 0.48t²k^) . (0.0196k^)

Since i^ . k^ = 0 and k^ . k^ = 1,
Φ = 0 + 0.48t² × 0.0196

Step 3: Calculate the magnetic flux
Φ = 0.48t² × 0.0196
Φ = 0.009408t² Wb (Weber)

So, the magnetic flux through the square loop at any time t is given by Φ = 0.009408t² Wb.

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The energy of UVC radiation with a wavelength of 212 nm is 9.38 × 10^(-19) Joules.

To calculate the energy of radiation, we can use the equation:

Energy = Planck's constant × speed of light / wavelength

Planck's constant (h) is approximately 6.626 × 10^(-34) Joule-seconds, and the speed of light (c) is approximately 3.00 × 10^8 meters per second.

Converting the wavelength from nanometers (nm) to meters (m) by dividing by 10^9, we can substitute the values into the equation:

Energy = (6.626 × 10^(-34) J·s) × (3.00 × 10^8 m/s) / (212 × 10^(-9) m)

Energy = 9.38 × 10^(-19) Joules

Therefore, the energy of UVC radiation with a wavelength of 212 nm is approximately 9.38 × 10^(-19) Joules.

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Answer:

The coefficient  of kinetic friction is 0.51.

Explanation:

Given that,

Applied force, F = 75 N

Mass of a box, m = 15 kg

The acceleration of the box is 3 m/s²

We need to find the coefficient  of kinetic friction. It is given by the formula as follows :

\(F=\mu_k F_N\)

Where,

\(F_N=mg\), is the normal force

\(\mu_k=\dfrac{F}{mg}\\\\\mu_k=\dfrac{75}{15\times 9.8}\\\\\mu_k=0.51\)

So, the coefficient  of kinetic friction is 0.51.

Explanation:

Gravity

Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996).

Answer: its flowing, reaction

Explanation: this is because currents in a device have a flowing object inside

Answer:

More energy

Explanation:

Steam is hotter than boiling water because it contains more energy

The principles of stoichiometry are based upon the law of conservation of mass.

Answer:

\( v = {75}ms {}^{ - 1} \)

Explanation:

The formula to calculate speed when given the momentum and mass is

\(v = \frac{p}{m} \)

\(v = \frac{120000}{1600} \\ v = 75 ms {}^{ - 1} \)

For the book to move in the direction of the movement arrow, a force in the direction of the desired movement must be applied causing the forces to be unbalanced.

option D is the correct answer.

Newton's first law of motion states that an object at rest or uniform motion in a straight line will continue in that path unless it is acted upon by an external force and it will move in the direction of the applied force.

Also, from Newton's second law of motion, which states that the force applied to an object is directly proportional to the product of mass and acceleration of the object.

Mathematically, Newton's second law of motion is written as;

F (net) = ma

F - Ff = ma

where;

Thus, for the book to move, the force of friction must be overcame by the applied force and this create an unbalanced force acting on the book. Also, the book will move in the direction of the net force acting on it.

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Answer:

1.76923077 meters

Explanation:

wavelength is denoted by the letter lambda it is equal to the speed (v) of a wave in a medium (air , water, light) divided by frequency , equals wavelength . so wavelength = v/f or = 23m/s ÷13hz

1. Connect the DC motor with a potentiometer to the Arduino board, along with a temperature sensor and an IR sensor with an LED.

2. Write the necessary code to integrate all the sensors and control the motor based on the inputs.

To connect a DC motor with a potentiometer to an Arduino board, you will need to use a motor driver module that can handle the power requirements of the motor. The motor driver module allows you to control the speed and direction of the motor using the Arduino. Connect the motor to the appropriate terminals on the motor driver module and the potentiometer to an analog input pin on the Arduino. The potentiometer will act as a voltage divider, allowing you to vary the input voltage to control the motor speed.

Next, connect a temperature sensor that can measure temperatures in the range of -10 to +45 degrees Celsius. Depending on the type of temperature sensor you are using, you may need to follow specific wiring instructions provided by the manufacturer. Connect the temperature sensor to the appropriate digital or analog input pin on the Arduino board.

Lastly, connect an IR sensor with an LED to detect motor overspeed. The IR sensor can be used to measure the rotational speed of the motor by detecting interruptions in the infrared beam caused by the rotating motor shaft. If the motor speed exceeds the threshold of 25,000 rpm, the IR sensor will trigger an output to activate the LED as a signal.

To make all the sensors work together, you will need to write code using the Arduino programming language. Use appropriate libraries and functions to read the sensor values and implement the desired logic for motor control and overspeed detection. You can define temperature thresholds and motor speed limits in the code and take appropriate actions based on the sensor readings.

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The minimum value of f is approximately 37.45 N.

There are two boxes resting on the floor: the first box weighs 50 N, and the second box weighs 30 N. A plank of mass 10 kg and length 6 m connects the two boxes. Friction can be neglected.

$$a_{total} = \frac{f - m_{board}g}{m_{box_1}+m_{box_2}+m_{board}}$$$$a_{total} = \frac{f - 10\cdot9.81}{50+30+10}$$$$a_{total} = \frac{f - 98.1}{90}$$

$$a_{box_1} = \frac{f}{m_{box_1}}$$$$a_{box_1} = \frac{f}{50}$$We can simplify the expression for the acceleration of the board by making the common denominator of the two accelerations equal:

$$a_{board} = \frac{f - 98.1}{90}$$$$a_{board} = \frac{f}{50} + \frac{f-98.1}{90}$$

Now, we just have to find the minimum value of f so that |aboard|>|abox|.|a_board|>|a_box_1|$$\left|\frac{f}{50} + \frac{f-98.1}{90}\right|>\left|\frac{f}{50}\right|$$$$\left|\frac{f}{50} + \frac{f-98.1}{90}\right| > \left|\frac{f}{50}\right|$$$$\left|\frac{9f + 5(f - 98.1)}{450}\right| > \frac{f}{50}$$$$\left|\frac{14f - 490.5}{450}\right| > \frac{f}{50}$$$$\left|\frac{28f - 981}{900}\right| > \frac{f}{50}$$$$28f - 981 > \frac{9f}{5}$$$$140f - 4905 > 9f$$$$131f > 4905$$$$f > \frac{4905}{131}$$

The minimum value of f is approximately 37.45 N.

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Gravity is the force that is responsible for the moon revolving around the earth.

The gravitational force of the earth is strong enough to keep the moon in orbit around it, and this force is what keeps the moon from flying off into space. Gravity is an attractive force that exists between any two objects in the universe. The force of gravity is proportional to the mass of the objects and inversely proportional to the distance between them. The closer two objects are to each other, the greater the force of gravity between them. Gravity is a fundamental force that plays a critical role in shaping the universe.

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Answer:cross-sectional area, and thus surface area, increases the amount of air resistance an object experiences

Explanation:

Answer: B

Explanation: It states they have the same mass so the eliminates the majority of the answers. Density = mass/volume so if sample A & B have the same mass but A is heavier that means A has more volume than sample B

Answer:the distance it travels in each second is decreasing

Explanation:

The minimum coefficient of friction required is 0.885  for a 925kg car rounds an unbanked curve at a speed of 25m/sec.

We know that if a body wants to travel from one place to another place, we need friction to move along the surface.

Now,we know that centripetal force is required to move along a curve.Also,due to friction same amount of force acts on the car to move along the surface.

It means centripetal force=mv²/r where v is the velocity of the body and r is the radius of the body is equal to force applied by the friction which is equal to =μmg  

So,mv²/r=μmg  

=>v²/r =μg

=>μ= v²/rg

On putting the values of speed, radius and acceleration due to gravity

=>μ=(25)²/(72×9.8)

=>μ=625/705.6

=>μ=0.885

Hence, required value of coefficient of friction is 0.885.

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Answer:

Newton's First Law of Motion (aka Law of Inertia)

Explanation:

Answer:

C. -35N/m

Explanation:

Using Hooke's Law, we know that the elastic constant of a spring can be found with this formula:
\(F=-kx\)

where:

\(F\) is the force ( in Newtons)
\(k\) is the constant ( in Newtons per meter)
\(x\) is the extension ( in meters)

thus, by rearranging the formula we can get:
\(k=-\frac{F}{x}\)

\(k = -\frac{10}{0.286}\)

\(k=-34.96503N/m\)

Rounding off the answer, we get -35N/m