A 2kg book is held against a vertical wall. The coefficient of friction is 0.45. What is the minimum force that must be applied on the book, perpendicular to the wall, to prevent the book from slipping down the wal

Answer:

I guess B

Explanation:

Because it stop by it self so that is digital

Answer:

The distribution of charge is the result of electron movement. Since conductors allow for electrons to be transported from particle to particle, a charged object will always distribute its charge until the overall repulsive forces between excess electrons is minimized.

Answer:

This is simply the movement and transportation of electrons

The student should have controlled the power of the mains supply, as this affects the amount of energy transferred to the heating element and the rate at which it increases in temperature.

A heating element is a device that produces heat by converting electrical energy into heat energy. It is commonly found in electric heaters, stoves, ovens, toasters, and other appliances. The heating element works by passing an electric current through a coil of wire or metal, typically made of nickel-chromium or iron-chromium alloy. When the current passes through the coil, it produces heat as a result of resistance to the flow of current. The heat is then transferred through the surrounding material and into the air. Heating elements are usually designed to operate at a certain temperature, and when this temperature is reached, the element turns off automatically. Heating elements are important components of many household appliances and are used to provide a safe and efficient source of heat.

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The net force is the hypotenuse of the triangle and the value of the net force is 14.14 N.

The net force is the force that has the same effect in magnitude and direction as two  or more forces acting together. We know that force is a vector quantity thus it does have both magnitude and direction.

Since force is a vector, we need to look at the direction of the forces in order to find out what the direction of the net force would have to be. A close look at the image would show us that the net force is the hypotenuse of the triangle.

The value of the net force is;

R = √(10)^2 + (10)^2

R = 14.14 N

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The speed of light in a vacuum is the same for all frames of reference.

so "Light travels through space at a speed of 3.0 x 10^8 m/s."

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Answer:

electromagnetic radiation hopefully

Answer:

Explanation:

Force of gravity is equal to mass times g

Fg=150 N

Fg=mg

150=m(9.81)

m=150/9.81 kg

FnetX=20-10=10 N

Fnetx=ma

10=150/9.81(a)

a=0.654 ms^-2

Note acceleration might need significant figures so it a=0.7 ms^-2

For the normal force, if the object isn't moving up or down. Then you can assume it's equal to the gravitational force which is 150 N.

If the object is accelerating up or down. I don't know how you would find normal force because not enough information.

Answer:

1.) 400s

2.) 1.875 m/s

3.) 1.125 m/s

Explanation:

Given that you traveled 150.meters south at a speed of 1.50m/s,

Time = distance/ speed

Substitute speed and distance into the formula

Time = 150/1.5

Time = 100 s

and then traveled 600. Meters north at a rate of 2.00 m/s.

Time = 600 / 2

Time = 300 s

1.) Total time = 100 + 300

Total time = 400 s

2.) The average speed will be total distance travelled over total time.

Total distance travelled = 150 + 600

Total distance travelled = 750 m

Substitute all the parameters into the formula

Average speed = 750/400

Average speed = 1.875 m/s

3.) Average velocity will be displacement over total time

Displacement = 600 - 150

Displacement = 450 m

Average velocity = 450/400

Average velocity = 1.125 m/s

Cost estimated is ₹[19/4]y/-.

Given :- Power=3kW  , Time=1hr 35min

Now to convert this time completely into hours following steps can be adopted:- 1 min =1/60 hour,       so 35min =35/60 hour

35min= 35/60 =7/12 hour

So total computed time = 1hr + [7/12]hr

computed time =19/12hr

Now since in the question there is no mention about cost , so let the cost be ₹y/unit.

Mathematically , Energy is the product of power and time , i.e.

E= Power x Computed time = 3 x 19/12 = 19/4 units.

Now the energy estimated is 19/4 units whose cost equivalent will be ₹[19/4]y/- , as cost of one unit energy  is ₹y/- so cost of 19/4 energy units will be ₹[19/4]y/-.

Once the cost of one unit energy is known to us then just its value in the place of y and we will get the exact amount expended on the total energy consumption.

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The Rio Grande is one of the largest river systems in the United States, running over 3,000 kilometers from the mountains of Colorado to the Gulf of Mexico. The river flows from north to south and passes through several states, including Colorado, New Mexico, and Texas.

A comparison of the discharge of the Rio Grande at Albuquerque and at Otowi Bridge (located upstream, near Santa Fe) is as follows: Albuquerque: It is the largest city in New Mexico, situated in the central part of the state. The Rio Grande flows through the city, where it is dammed to form a large lake known as Elephant Butte Reservoir. The discharge of the Rio Grande at Albuquerque is around 100 cubic feet per second (cfs) during normal conditions.

This means that the river has twice the volume of water at Otowi Bridge than at Albuquerque.During times of drought, the river's discharge can drop to dangerously low levels, affecting wildlife and human communities that rely on the river for water. The river's discharge can also increase during periods of heavy rainfall or snowmelt, leading to flooding in downstream communities.

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The part of a sound during which amplitude increases is known as C. attack.

In the context of sound, the attack refers to the initial part of a sound waveform where the amplitude rapidly increases from silence or a low level to its maximum level. It represents the onset or the beginning of a sound. The attack phase is responsible for the perception of the sound's initial intensity or strength.

After the attack phase, the sound may enter the decay phase, where the amplitude decreases over time. The decay is followed by other phases of the sound envelope, such as sustain and release, depending on the characteristics of the sound source.

Pitch, on the other hand, refers to the perceived frequency of a sound, while an octave represents a specific interval between two frequencies. "Start note" is not a term commonly used in the context of describing the characteristics of a sound.

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Answer:

\(a=0.45\ m/s^2\)

Explanation:

Given that,

The radius of a bend, r = 20 m

Velocity of motorcyclist, v = 3 m/s

The combined mass of motorcyclist and the motorcycle is 50 kg

We need to find the motorcyclist’s centripetal acceleration. The formula used to find the centripetal acceleration is given by :

\(a=\dfrac{v^2}{r}\\\\a=\dfrac{(3)^2}{20}\\\\a=0.45\ m/s^2\)

So, the acceleration of the motorcyclist is \(0.45\ m/s^2\).

The man who set up the first psychology laboratory was Wilhelm Wundt

The psychology laboratories are specially designed spaces where psychology students can gather data from human subjects using the same tools as licensed psychologists.

It can be noted that in 1879, Wundt founded the first psychological laboratory of the world in Leipzig, Germany, where he mainly studied sensations and feelings by employing experimental methods.

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The frequency of green apples is 0.3. To find the frequency of green apples, we need to use the fact that the sum of frequencies for all possible outcomes is equal to 1.

Let the frequency of green apples be denoted by x. It is given that the frequency of red apples is 0.7. Therefore, the frequency of green apples can be determined using the formula: Frequency of green apples + Frequency of red apples = Total frequency of applesx + 0.7 = 1 (as the total frequency of apples is 1)

Subtracting 0.7 from both sides,x + 0.7 - 0.7 = 1 - 0.7x = 0.3

Therefore, the frequency of green apples is 0.3.

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Answer: 8.75 km/hr

Explanation:

Concept to know

Average speed: total distance/total time

-------------------------------------------------------

 total distance/total time

=(12.2+19.3)/(1.4+2.2) ⇔ add the numbers of two time running together

=31.5/3.6 ⇔ simplify

=8.75 km/hr

Hope this helps!! :)

Please let me know if you have any question

Answer:The equation is balanced for both charge and nucleon number, as required.

Explanation:2713Al + 42He → 3015P + n

The difference in speed that occurs when a student sits in a fixed position on a boat and throws an object to the right with a velocity V while the boat moves to the left at a velocity that is much slower than the object's velocity can be explained as follows:

When the student throws the object to the right with a velocity V, the boat moves to the left due to the conservation of momentum. This movement of the boat to the left is very small, and its velocity is much slower than that of the object. When the object is in flight, the velocity of the student and the boat is the same as it was before the object was thrown to the right.The difference in speed between the boat and the object is due to the conservation of momentum. The boat and student move in the opposite direction with a velocity that is much smaller than that of the object.

The momentum of the object is equal to its mass multiplied by its velocity, and this momentum must be conserved. When the object is thrown to the right, the momentum of the object is transferred to the boat and the student.

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Explanation:

1 Kilocalories = 4,184 Joules

Answer:

The relationship between calorie and joule are proportionate. Which implies, the calorie is directly proportional to the joule. That means-

When the value in terms of calorie increases, its corresponding value in joules also increases at a rate of 4.2.

When the value in terms of calorie decreases, its corresponding value in joules also decreases at a rate of 4.2.

If you wax the hood of a car, when it rains, the raindrops do not stick to the car. Instead, they BEAD UP on the car (bonding with other water molecules) due to adhesion. So the correct option is D.

Adhesion is a property in which a substance with the same properties will unite when they come into contact, staying attached by the force of intermolecular bonds.

As in the example, the water molecules are going to be in an environment where the wax molecules are going to have neutral charges, they are going to be more potentiated to unite with each other due to their different positive and negative charges, which will make them unite closely. This will then cause the water molecules to join together to form water droplets on the surface of the car instead of just spreading.

Therefore, we can confirm that the correct option is D. adhesion.

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The magnitude of the final velocity of the car after the collision is 2.47 m/s.

To determine the final speed of the car, we need to use the impulse-momentum theorem, which states that the impulse (change in momentum) of an object is equal to the force applied to it times the time over which the force is applied. In this case, the impulse is equal to the change in momentum of the car during the collision.

We can use the graph provided to find the impulse by calculating the area under the curve. The area under the curve represents the change in momentum of the car. Since momentum is a vector quantity, we need to take into account the direction of the velocity before and after the collision. In this case, the car comes to a complete stop, so the velocity after the collision is in the opposite direction of the initial velocity.

Using the graph, we find that the impulse is equal to:

impulse = area under curve = 0.5 * 800 N * 0.0025 s = 1 Ns

Now we can use the impulse-momentum theorem to find the final velocity of the car:

impulse = change in momentum = mass * (final velocity - initial velocity)

Solving for the final velocity, we get:

final velocity = (impulse + mass * initial velocity) / mass

final velocity = (1 Ns + 0.300 kg * 0.860 m/s) / 0.300 kg

final velocity = 2.47 m/s

Therefore, the magnitude of the final velocity of the car after the collision is 2.47 m/s.

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The most common injury related to electrical hazards are Electrical burns.

What are electrical hazards?

An electrical burn is a type of skin burn that develops when your body comes into contact with electricity. It is possible for electricity to pass through your body when it comes into contact with it. When this occurs, the voltage has the potential to harm tissues and organs.

Hence, The most common injury related to electrical hazards are Electrical burns.

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Speed of the proton = v = 3 x \(10^{6}\) m/s

Angle between the velocity and magnetic field = 37°

magnitude of magnetic field = B = 0.3T

⇒ The magnitude of the magnetic field of the proton:-

    Using the relation F = q ( V x B) we can find the force

     F = q ( V x B ) can also be written as :-

     F = q x V x B x sin∅ , substituting B and V in this equation ,

     F = q x ( 3 x \(10^{6}\) m/s) x ( 0.3T) sin(37°)

     We know the charge of the proton (q)  = 1.6 x \(10^{-19}\)c

      F =  (1.6 x \(10^{-19}\))  x ( 3 x \(10^{6}\) m/s) x ( 0.3T)  x sin(37°)

         = 1.44 x \(10^{-13}\) x sin(37°)

         = 8.899 x \(10^{-14}\) N

⇒ To find the acceleration of the proton :-

  Now we know the value of the Force . So, we can use the relation

      \(f = m x a\)   to get the acceleration

     \(a = \frac{f}{m}\) = \(\frac{8.899 x 10^{-19}N }{1.6 x 10^{-27}kg }\) = 5.561 x \(10^8\) m /s

 ∴   the acceleration of proton  = 5.561 x \(10^8\) m /s

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The work done by the brakes to stop the car will be 56.25 kN-m.

If the amount of force is applied to the body and the body gets displaced from its original place. Then it is said to work is done on the system. The work done is given as,

WD = Force x Displacement

A vehicle is going along a street when the driver detects a hedgehog crossing ahead. The driver applies a slowing down the power of 2500 N and figures out how to stop the vehicle after 7.5 meters to stay away from the hedgehog.

The work done is calculated as,

WD = 7500 x 7.5

WD = 56,250 N-m

WD = 56.25 kN-m

The work done by the brakes to stop the car will be 56.25 kN-m.

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The time constant of the circuit can be determined from the formula τ = RC. The values given in the question are R = 4.00 MΩ and C = 3.00 µF. Thus, the time constant is given as:τ = RC = (4.00 × 10^6 Ω) × (3.00 × 10^-6 F) = 12 secondsb. The current in the circuit can be found by using Ohm’s law, which states that I = V/R, where V is the voltage across the circuit.

The voltage across the circuit is 12.0 V, so the current is given as:I = V/R = (12.0 V)/(4.00 MΩ) = 3.00 µAThe charge on the capacitor as a function of time can be found using the formula Q = Qmax (1 - e^(-t/τ)), where Qmax is the maximum charge that can be stored by the capacitor. The maximum charge can be found using the formula Qmax = CV, where V is the voltage across the capacitor.

The voltage across the capacitor is the same as the voltage across the circuit, which is 12.0 V. Thus, the maximum charge that can be stored by the capacitor is:Qmax = CV = (3.00 × 10^-6 F) × (12.0 V) = 36 µCThe charge on the capacitor as a function of time is given as:Q = Qmax (1 - e^(-t/τ)) = (36 µC) (1 - e^(-t/12)).

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When you pick up an apple with your hand, a force is exerted on the apple. This force is a result of the interaction between the apple and your hand.

The force is generated by the friction between the apple and your hand, as your hand exerts a pushing or gripping pressure on the apple. Additionally, the force is exerted on the apple by the gravity of the Earth, as the apple is pulled down towards the ground as a result of its weight. These two forces combine to create the force exerted on the apple by your hand.

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Write each force in component form:

v ₁ : 50 N due east   →   (50 N) i

v ₂ : 80 N at N 45° E   →   (80 N) (cos(45°) i + sin(45°) j ) ≈ (56.5 N) (i + j )

The resultant force is the sum of these two vectors:

r = v ₁ + v ₂ ≈ (106.5 N) i + (56.5 N) j

Its magnitude is

|| r || = √[(106.5 N)² + (56.5 N)²] ≈ 121 N

and has direction θ such that

tan(θ) = (56.5 N) / (106.5 N)   →   θ ≈ 28.0°

i.e. a direction of about E 28.0° N. (Just to clear up any confusion, I mean 28.0° north of east, or 28.0° relative to the positive x-axis.)

If you are constantly revolving around the Earth instead of falling down into it you feel weightless due to centripetal force. Therefore, option C is correct.

When you are on a spacecraft and revolving around the sun you will feel weightlessness because of the centripetal force acting on your body. The gravity force acts on your body and on the spacecraft, so you fall towards the earth at the same speed as the spacecraft moves forward.

The spacecraft's velocity is constantly maintained along the curved surface of the trajectory around the Earth. This follows the earth's curvature and the centripetal force pulls the spacecraft toward the earth so that the spacecraft is balanced creating weightlessness.

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The magnitude of the potential difference needed to give an alpha particle 324.0 keV of kinetic energy is 2.50 x 10^6 kV.

The magnitude of the potential difference needed to give an alpha particle 324.0 keV of kinetic energy is calculated using the formula KE=1/2mv^2. Here, m is the mass of the alpha particle (6.644 x 10^-27 kg) and v is its velocity.

Thus, we have 324.0 keV = (1/2) (6.644 x 10^-27 kg)[v^2].

Solving for v, we get v = 1.38 x 10^7 m/s.

The potential difference, V, can then be calculated using the formula

V = (mv^2)/(2e)

where e is the charge of the alpha particle (charge of two protons, or 4.803 x 10^-10 C).

Thus, V = (6.644 x 10^-27 kg)(1.38 x 10^7 m/s)^2/(2(4.803 x 10^-10 C)) = 2.50 x 10^6 kV.

Therefore, the magnitude of the potential difference needed to give an alpha particle 324.0 keV of kinetic energy is 2.50 x 10^6 kV.

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