A block with mass M slides down an incline of angle θ at constant velocity v.
Which of the following expressions is equal to the magnitude of frictional force between the block and the incline? (Note: The acceleration of gravity g = 10 m/s2.)
A.M∙g∙sin θ
B.M∙g∙cos θ
C.M∙g / sin θ
D.M∙g / cos θ

Explanation:

I am not sure about this question sry but u can try asking a tutor u don't need to use any points

Answer:

Photovoltaic detection is a technique that converts light into electrical energy. It is a process that involves the use of a photovoltaic cell, which is made up of semiconductor materials, to generate an electric current when exposed to light.

The photovoltaic cell absorbs the photons of light, which then knock electrons out of their orbits, creating a flow of electricity. The amount of electricity produced is proportional to the intensity of the light. The photovoltaic cell is commonly used in solar panels to generate electricity from sunlight. The efficiency of the photovoltaic cell is dependent on several factors, including the type of semiconductor material used, the purity of the material, and the thickness of the cell.

The photovoltaic cell has many applications, including in solar power generation, telecommunications, and remote sensing. The technique of photovoltaic detection is an important area of research, as it has the potential to provide a clean and renewable source of energy that can help mitigate climate change.

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While certain types of glass containers may be suitable for short-term storage of vinegar, it is generally recommended to use non-reactive materials, such as plastic or stainless steel, for long-term storage to avoid any potential chemical reactions or corrosion.

Vinegar is an acidic liquid that contains acetic acid. When vinegar comes into contact with certain types of glass, particularly those made of lead or other reactive materials, a chemical reaction can occur. This reaction can lead to the leaching of potentially harmful substances into the vinegar.

Glass containers made from specific types of glass, such as soda-lime glass, are generally safe for storing vinegar.

However, it is important to note that prolonged storage or exposure to vinegar can still cause the glass to corrode over time. This can result in the deterioration of the glass container, potentially leading to breakage or the release of glass fragments.

To avoid any potential issues, it is recommended to use containers made of non-reactive materials, such as food-grade plastic or stainless steel, for long-term storage of vinegar. These materials do not react with the acidic nature of vinegar and do not pose a risk of leaching harmful substances.

Additionally, it is important to store vinegar in a cool, dark place to maintain its quality and prevent spoilage. Exposure to light and heat can degrade the quality of vinegar over time.

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Answer:

P = 0.98 W

Explanation:

Given that,

Mass, m = 1 kg

Height, h = 0.9 m

(a) We need to find power must the battery supply to the vehicle for a run time of 9 seconds. Power is given by work done divided by time. It can be given by :

\(P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{1\times 9.8\times 0.9}{9}\\\\P=0.98\ W\)

So, the required power is 0.98 W.

False, supposedly when a hurricane moves ashore, it quickly rises due to friction and a lack of warm, moist air.

Hurricanes are known as cyclones as well as typhoons in other tropical regions. Typhoons are one of the most disturbing types of natural disasters at the moment.

Scientifically, the cause of hurricanes from warm water, warm moist air, and light upper-level winds as the primary ingredients of their formation.

Typhoons have other terms, depending on where they occur. the scientific term for a hurricane is a tropical cyclone. Only tropical cyclones that form over the Atlantic Ocean or the eastern Pacific Ocean are called "hurricanes".

The cause of a hurricane occurs when a warm, moist air mass from the sea surface begins to rise rapidly and collides with a colder air mass. The friction pushes the warm water vapor to condense. During the condensation process, latent heat is emitted.

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Potential energy is stored energy because it has the potential to do something which laters turns into kinetic energy which is the moving energy.

Answer:

The moon does not have an atmosphere because it does not have enough gravity to hold onto the gases that make up an atmosphere. The moon also does not have plate tectonic activity because it does not have enough internal heat to drive the movement of the plates.

Explanation:

1) The similarity is that in both the cases the light is deviated from its original path i.e. their angles change (even for a short while in a refraction) and the difference is in reflection the angle of incidence is equal to the angle of reflection whereas in refraction the angle of incidence is not equal to the angle of reflection.

2) A white t-shirt would feel cooler on a sunny day.

A black surface attracts heat and wearing a black t-shirt would attract the heat from the sun making us feel hotter.

3) There are three measurable properties

of wave motion: amplitude, wavelength,

and frequency. A definitive experiment was

Young's double slit experiment, which

demonstrated that light shined at two slits

in a screen show an interference pattern

characteristic of waves of light, rather than

particles.

Answer:

PE = 137.2931 J

Explanation:

PE = 137.2931 J

Answer: In this scenario, we have two carts colliding with each other. One cart weighs 250 kg and is moving at a speed of 8 m/s, while the other cart weighs 100 kg and is initially at rest.

After the collision, the 250 kg cart continues moving forward, but at a slower speed of 3 m/s. We want to find out the speed at which the 100 kg cart moves after the collision.

To solve this, we use the principle that the total "push" or momentum before the collision should be the same as the total momentum after the collision.

Since the 100 kg cart is initially at rest, its momentum is zero. The momentum of the 250 kg cart before the collision is 250 kg * 8 m/s = 2000 kg·m/s.

After the collision, the momentum of the 250 kg cart becomes 250 kg * 3 m/s = 750 kg·m/s.

To find the momentum of the 100 kg cart after the collision, we subtract the momentum of the 250 kg cart after the collision from the total momentum before the collision: 2000 kg·m/s - 750 kg·m/s = 1250 kg·m/s.

Now, we divide this momentum by the mass of the 100 kg cart to find its velocity: 1250 kg·m/s / 100 kg = 12.5 m/s.

Therefore, the 100 kg cart moves at a velocity of 12.5 m/s after the collision, in the opposite direction of the 250 kg cart's motion.

The cost of operation for an A.C for 10 hours per day for a month will be 71,100 francs.

Power is the amount of energy transferred or converted per unit time. The unit of power is the watt, equal to one joule per second. Power is a scalar quantity.

Cost of operation for 10 hours a day;

Daily consumption = 3kW x 10 hours

Daily Consumption = 30kW

Since 1kWH = 79 francs;

Daily consumption amount = 30 x 79 francs

Daily consumption amount = 2,370 francs

Therefore, the monthly consumption (using 30days) will be;

2,370 francs x 30 = 71,100 francs

In conclusion, 71,100 francs will be spent in a month (30 days) to run the 3kW rated A.C for 10 hours a day at 1kWH.

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To convert 1 liter (L) to milliliters (mL), you would multiply 1 by 1000, because there are 1000 mL in 1 L. Therefore, 1 L is equal to 1000 mL.

0.01ml=0.00001L,100mL=0.1L,62L=62000mL,1.02 L = 1020 mL,

912 mL=0.912 L,0.55 L = 550 mL.

How to convert these given volume to the mising units?

To convert 0.01 milliliters (mL) to liters (L), you would divide 0.01 by 1000, because there are 1000 mL in 1 L. Therefore, 0.01 mL is equal to 0.00001 L.

To convert 100 milliliters (mL) to liters (L), you would divide 100 by 1000, because there are 1000 mL in 1 L. Therefore, 100 mL is equal to 0.1 L.

To convert 62 liters (L) to milliliters (mL), you would multiply 62 by 1000, because there are 1000 mL in 1 L. Therefore, 62 L is equal to 62000 mL.

To convert 1.02 liters (L) to milliliters (mL), you would multiply 1.02 by 1000, because there are 1000 mL in 1 L. Therefore, 1.02 L is equal to 1020 mL.

To convert 912 milliliters (mL) to liters (L), you would divide 912 by 1000, because there are 1000 mL in 1 L. Therefore, 912 mL is equal to 0.912 L.

To convert 0.55 liters (L) to milliliters (mL), you would multiply 0.55 by 1000, because there are 1000 mL in 1 L. Therefore, 0.55 L is equal to 550 mL.

It's important to note that when converting between units of volume, the conversion factor is always the same, but the direction of the conversion can change depending on which unit is being converted to or from.

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The image will be formed at a distance of 30 cm in its front. Hence, this is the required solution.

Given that,

Object distance, u = -15 cm

The radius of curvature of the concave mirror, R = 20 cm

Focal length, f = R/2 = -10 cm (negative for concave mirror)

Let v is the distance between mirror and the formed image. Using mirror's formula to find it as :

\($\frac{1}{u}+\frac{1}{v}=\frac{1}{f}$\)

\($\frac{1}{v}=\frac{1}{f}-\frac{1}{u}$\)

\($\frac{1}{v}=\frac{1}{(-10)}-\frac{1}{(-15)}$\)

\($v=-30 \mathrm{~cm}$\)

So, the image will be formed at a distance of 30 cm in its front. Hence, this is the required solution.

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The current sensitivity of a moving coil galvanometer increases with a decrease in its resistance.

What is Current Sensitivity?

Current sensitivity is a measure of the responsiveness of an instrument to the current flowing through it. In particular, it is the deflection produced by a given amount of current passing through a device. The higher the current sensitivity, the smaller the amount of current required to produce a given deflection, and thus the more sensitive the instrument is to changes in current.

This is because the current sensitivity of a galvanometer is defined as the deflection produced per unit of current passed through it. Therefore, a higher current sensitivity means that a smaller current can produce a larger deflection, which can be achieved by decreasing the resistance of the galvanometer. This is because a lower resistance will allow a larger current to flow through the coil, which will result in a larger deflection of the coil.

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Answer:

Resistance

Explanation:

Sensitivity of a moving coil galvanometer can be increased by increasing the number of turns in the coil, the area of coil and magnetic field whereas by decreasing the couple per unit twist of the suspension.

18,000 degrees in one second i believe

Answer:

please send the pic again it is not clear

The total head of the pipe is 430,400 Pa.

The total head of the pipe is the total pressure of the pipe and it is calculated as follows;

Pt = Pi + ¹/₂ρv² + ρgh

where;

Pt = ( 350,000) + ¹/₂(1000)(2)²  +  (1000 x 9.8 x 8)

Pt = 430,400 Pa

Thus, the total head or total pressure of the pipe depends on the density of water, speed of water and height above datum.

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Answer:

the magnitude of the electrostatic force between these two charged particles is 4.32 x 10^-28 N.

Explanation:

F = k * (q1 * q2) / r^2

where:

F is the electrostatic force

k is the Coulomb's constant (9 x 10^9 Nm^2/C^2)

q1 and q2 are the charges of the particles

r is the distance between the particles

Plugging in the given values:

q1 = 8 x 10^-19 C

q2 = 4.8 x 10^-19 C

r = 1.2 x 10^-4 m

k = 9 x 10^9 Nm^2/C^2

we can calculate the electrostatic force:

F = (9 x 10^9 Nm^2/C^2) * (8 x 10^-19 C) * (4.8 x 10^-19 C) / (1.2 x 10^-4 m)^2

F = 4.32 x 10^-28 N

The electrostatic force between these two particles is therefore calculated to be **1.44x10⁻¹⁴ N**1 using Coulomb's equation of electrostatic force.

With a force proportional to the product of the charges and inversely proportional to the square of the distance between them, Coulomb's law states that like charges repel and opposite charges attract. There is a formula that may be used to calculate the force between two point charges. Charles-Augustin de Coulomb created Coulomb's law in 1785

The electrostatic force between two charges is inversely proportional to the square of the distance between them and directly proportional to the product of their magnitudes1.

The centers of the two tiny charged particles in this example are separated by a distance of **1.2x10⁻⁴ meter**, with charges of **8x10⁻¹⁹** and **4.8*10⁻¹⁹**, respectively.

F is the electrostatic force

k is the Coulomb's constant (9 x 10⁹ Nm²C²)

q1 and q2 are the charges of the particles

r is the distance between the particles

Plugging in the given values:

q1 = 8 x 10⁻¹⁹ C

q2 = 4.8 x 10⁻¹⁹C

r = 1.2 x 10⁻⁴ m

k = 9 x 10₉ Nm²/C²

we can calculate the electrostatic force:

F = (9 x 10⁹Nm²/C²) * (8 x 10⁻¹⁹ C) * (4.8 x 10⁻¹⁹ C) / (1.2 x 10⁻⁴ m)²

The electrostatic force between these two particles is therefore calculated to be **1.44x10⁻¹⁴N**1 using Coulomb's equation of electrostatic force.

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Answer:Correct option is A)

v=u+at

44×

18

5

​

Explanation:

Answer:

Explanation:

The answer is **(c) 9.39 m/s** for the velocity of the bullet-block system after it's hit, and **(g) 209.39 m/s** for the bullet's velocity before it hit the box.

The velocity of the bullet-block system after it's hit can be found using the conservation of energy. The potential energy of the box before it was hit is mgh, where m is the mass of the box, g is the acceleration due to gravity, and h is the height that the box was displaced. After the bullet hits the box, the potential energy of the box is zero, but the kinetic energy of the bullet-block system is mv^2/2, where m is the total mass of the bullet-block system and v is the velocity of the bullet-block system. Setting these two expressions equal to each other, we get:

```

mgh = mv^2/2

```

Solving for v, we get:

```

v = sqrt(2mgh)

```

In this case, we have:

* m = 0.05 kg + 1.3 kg = 1.35 kg

* g = 9.8 m/s^2

* h = 4.5 m

So, the velocity of the bullet-block system after it's hit is:

```

v = sqrt(2 * 1.35 kg * 9.8 m/s^2 * 4.5 m) = 9.39 m/s

```

The velocity of the bullet before it hit the box can be found using the conservation of momentum. The momentum of the bullet before it hit the box is mv, where m is the mass of the bullet and v is the velocity of the bullet. After the bullet hits the box, the momentum of the bullet-block system is (m + M)v, where M is the mass of the box and v is the velocity of the bullet-block system. Setting these two expressions equal to each other, we get:

```

mv = (m + M)v

```

Solving for v, we get:

```

v = mv/(m + M)

```

In this case, we have:

* m = 0.05 kg

* M = 1.3 kg

* v = 9.39 m/s

So, the velocity of the bullet before it hit the box is:

```

v = 0.05 kg * 9.39 m/s / (0.05 kg + 1.3 kg) = 209.39 m/s

```

The velocity of the bullet-block system after the collision is approximately a) 6.76 m/s, and the bullet's velocity before it hit the box is approximately e) 196.76 m/s.

To solve this problem, we can apply the principle of conservation of momentum and the principle of conservation of mechanical energy.

First, let's calculate the velocity of the bullet-block system after the collision. We can use the principle of conservation of momentum, which states that the total momentum before the collision is equal to the total momentum after the collision.

Let m1 be the mass of the bullet (0.05 kg) and m2 be the mass of the box (1.3 kg). Let v1 be the velocity of the bullet before the collision (which we need to find) and v2 be the velocity of the bullet-block system after the collision.

Using the conservation of momentum:

m1 * v1 = (m1 + m2) * v2

0.05 kg * v1 = (0.05 kg + 1.3 kg) * v2

0.05 kg * v1 = 1.35 kg * v2

Now, let's calculate the velocity of the bullet-block system (v2). Since the system goes up by a height of 4.5 m, we can use the principle of conservation of mechanical energy.

m1 * v1^2 = (m1 + m2) * v2^2 + m2 * g * h

0.05 kg * v1^2 = 1.35 kg * v2^2 + 1.3 kg * 9.8 m/s^2 * 4.5 m

Now, we can substitute the value of v2 from the momentum equation into the energy equation and solve for v1.

By solving these equations, we find that v1 is approximately 196.76 m/s.

Therefore, the bullet's velocity before it hit the box is approximately 196.76 m/s. (e) 196.76 m/s

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The water pressure at the base is 98,000 Pa, and the force exerted at the base of the tank is 2,768,460 N.

To find the water pressure at the base of the tank, take the formula:

Pressure = density × gravity × height

In which

Density = density of water (1000 kg/m³)

Gravity = acceleration due to gravity (9.8 m/s²)

Height = height of the column

According to question:

Height of the water column = 10 m

Take the formula:

P = 1000 kg/m³ × 9.8 m/s² × 10 m

= 98,000 Pa

To find the force at the base of the tank, take the formula:

Force = Pressure × Area

In which

Pressure = pressure at the base of the tank

Area = base area of the tank

The base area of a cylindrical tank can be found by the formula:

Area = π × r²

In which:

Diameter of the tank = 6 m

To find the radius, divide the diameter by 2:

Radius = 6 m ÷ 2

= 3 m

Put the values into the formula:

Area = π × (3 m)²

= 28.27 m²

Now, find the force:

Force = 98,000 Pa × 28.27 m²

= 2,768,460 N

Thus, the water pressure at the base is 98,000 Pa, and the force exerted at the base of the tank is 2,768,460 N.

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Answer:

car D

Explanation:

1) before to compare all the values of the velocities, they must be in the same units of measurement. It means:

for car A: V=60km / 1h=60km/h;

for car B: V=30km / 0.5h=60km/h;

for car C: V=20km / 0.25h=80km/h;

for car D: V=10km / (7/60)h≈85.7km/h.

2) according to the values calculated in item 1 the car D had the highest velocity.

Answer:

Below

Explanation:

We can use this formula to find the velocity of an object

     velocity = displacement / change in time

*note I converted all distances to meters and all times to seconds, its not necessary though**

CarAvelocity = 60,000 m / 3600 sec

                      = 16.66667 m/s

CarBvelocity = 30,000 m / 1800 sec

                     = 16.66667 m/s

CarCvelocity = 20,000 m / 900 sec

                      = 22.2222 m/s

CarDvelocity = 10,000 m / 420 sec

                      = 23.80952 m/s

Therefor, car D has the highest velocity

Hope this helps!

ANSWER

True.

EXPLANATION

An insulator is an object that does not allow for the free flow of electricity through it.

Therefore, when a charge is added to an insulator, it remians localized even though charges have the tendency to move about and spread.

Hence, the answer is True.

The exploded star is called a black hole.

The time horizon of the black hole is an area of spacetime where gravitational pull is so intense that nothing, not even light or other electromagnetic waves, have the energy to pass through it.

It is believed that the first black holes appeared shortly after the big bang, in the beginning of the cosmos. When the core of an extremely massive star is collapsed on itself, stellar black holes are created.

A supernova, also known as an exploding star, is also brought on by this collapse and sends a portion of the star into space.

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Answer:

The angular acceleration is  \(\alpha = 0.788 \ rad/s^2\)

Explanation:

The  diagram for this question is shown on the first uploaded image (gotten from study website)

From the question we are told that

      The mass of the block on the right is  \(m_r = 4.4 \ kg\)

       The mass of the block on the left is \(m_l = 12 \ kg\)

       The distance of the left mass to the center is  \(r_l = 0.6 \ m\)

       The distance of the right  mass to the center is  \(r_l = 1.4 \ m\)

At the point the system is allowed to rotate the upward torque is mathematically evaluated as

        \(\tau = m_l * g * r_l - m_r * g * r_r\)

substituting values

        \(\tau = 12 * 9.8 * 0.6 - 4.4 * 9.8 * 1.4\)

        \(\tau = 10.2 \ N m\)

The moment of inertia of the system is  mathematically represented as

          \(I = m_l r_l ^2 +m_r r_r^2\)

substituting values

         \(I = 12 * (0.6)^2 +(4.4)* (1.4)^2\)

        \(I = 12.94 \ kg \cdot m^2\)

The angular acceleration is mathematically represented as

         \(\alpha = \frac{\tau}{I}\)

substituting values

        \(\alpha = \frac{10.2}{12.94}\)

         \(\alpha = 0.788 \ rad/s^2\)

After considering the given data we come to the conclusion that the increase in the internal energy of the tie and spike is 16.322 J, under the condition that  a given weight of  0.76 kg spike had been jamed into a railroad tie .

In order to evaluate the increase in internal energy of the tie and spike we have to apply the formula of kinetic energy which is
1/2 × mv²
Here,
m = mass
v = velocity
Staging the values in the formula
Kinetic energy of the spike = (1/2)× (0.76)×(4.8)²= 87.2064 J
Energy absorbed by the tie and spike = 87.2064 J × 0.187 = 16.322 J

Hence, the evaluate rise in internal energy of the tie and spike is 16.322 J.
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The theories change over time because new information and technology may be developed that influence the theory. Therefore, option B is correct.

As new information and perspectives become available, established theories may be changed or refuted. If a new or modified theory explains all the old theory did and then some, scientists are likely to accept it.

When fresh data emerges that refutes an existing theory, scientific theories can be revised or replaced. All scientific theories are founded on observable, testable data, and they can be changed when new information is found that contradicts the present idea.

When certain features of a hypothesis are refuted by fresh experimental data, a theory might be altered in science.

Thus, option B is correct.

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(a) The amplitude of the wave is 0.2 m.

(b) The period of the wave is  4 s.

(c) The wavelength of the wave is 100 m.

(a) The amplitude of the wave is the maximum displacement of the wave.

amplitude of the wave = 0.2 m

(b) The period of the wave is the time taken for the wave to make one complete cycle.

period of the wave = 5.5 s - 1.5 s = 4 s

(c) The wavelength of the wave is calculated as follows;

λ = v / f

where;

f = 1/t = 1 / 4s = 0.25 Hz

λ = ( 25 m/s ) / 0.25 Hz

λ = 100 m

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The convection zone is the area of the sun does gas rise as it heats up, then fall back down as it cools.

This part of the Sun is found below the photosphere and helps isn the area where the form of heat transfer known as Convection takes place.

This occurs when heated gases rise up and then falls back when cooled as a result if hot gases being less dense.

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