Nabil wants to work out the density of a pebble. He has a displacement can and a beaker. What other piece of equipment will he need?

The force that acts on the conductor is obtained from the calculation as  15.5 N.

We know that a magnetic field has to do with the region in space where the influence of a magnet can be felt. In this case, we have been told that;

The magnetic field of the conductor (B)= 0.75 T

The current (I) =  69 A

Length of the wire = 30 cm or 0.3 m

Let us recall the formula that says;

F = BIL

F = force on the conductor

B = magnetic field

L = length of the conductor

Thus if we substitute values;

F = 0.75 * 69 * 0.3

F = 15.5 N

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Answer:

b. 49.8

Explanation:

θc = sin^-1(1/1.309) = 49.81

Answer: the displacement should be zero while the distance would be 200

Explanation:

The displacement is the change in position of an object from its origin. The questions states that he ran a full circular lap therefore started as point of origin and ended up at point of origin. This would mean that his displacement is zero.

Distance on the other hand is just simple adding without the use of vectors and such. In this case the distance he ran would be 200m.

Radiation is correct answer.

What is radiation?

Radiation is energy that moves through space at the speed of light from a source. This energy is coupled with an electric and magnetic field, and it has wave-like qualities. Radiation is sometimes known as "electromagnetic waves."

UV rays, which can be fatal, are readily avoided by covering oneself. The visors are coated to reflect UV, while the suit's opaque layers take care of the rest. On the other end of the spectrum, x rays and gamma rays are difficult to shield—here is where lead comes in, but there isn't enough of this type of radiation to justify the added weight. A radiologist's lead apron can weigh 10-15 kg, so filling the entire suit with this thickness of lead would add at least 25-40 kg to an already large and heavy suit. The material of the suit absorbs some of the radiation, although this is not the greatest danger to astronauts.

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The initial velocity of the cannon ball when it reached a height of 4.75 m is 9.65 m/s.

Velocity- The rate of change of displacement is the definition of velocity.

The formula below is used to determine the cannon ball's initial velocity.

Formula:

v² = u²+2gH......... Equation 1

Where:

v = Final velocity

u = Initial velocity

H = Height

g = Acceleration due to gravity.

From the question,

Given:

v = 0 m/s (At the maximum height)

H = 4.75 m

g = 9.8 m/s

Substitute these values into equation 1

0² = u²+2×9.8×4.75

u² = 93.1

u = √(93.1)

u = 9.65 m/s

Hence, the initial velocity of the cannonball is 9.65 m/s.

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Kinetic energy will be 600J. According to law of conservation energy: All the energy in a system will simply change the state, and no more nor less energy will be created or lost during the operation of the system. In this case, then all 600J of energy will be transformed during the operation of car.

kinetic energy, Chemical compounds' bonds contain energy. Chemical reactions have the potential to release chemical energy, frequently in the form of heat; these kinds of reactions are referred to as exothermic. Some of the energy from reactions that need heat input to continue may be stored as chemical energy in newly formed bonds.

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The radius of the circular orbit is equal to V/2π  where V is the velocity of the orbiting object.

The orbital period can be described as the amount of time a given astronomical body occurs to complete one orbit around another object. It applies to planets orbiting the Sun, moons orbiting planets, etc.

In general, the sidereal period is referred to by the orbital period, calculated by a 360° revolution of one body around its primary.

Given, the orbital period = 1 day

The total distance covered will be equal to the circumference of the circular orbit.

Distance = 2πr   where r is the radius of the orbit.

We know that distance = Velocity ×time

2πr = V × 1

r = V/2π

Where V is the velocity of the orbiting object.

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The inner walls of veins and arteries can be affected by coronavirus infection, which can result in blood vessel inflammation, harm to extremely small vessels, and blood clots leading to the risks of cardiovascular diseases.

The mechanisms by which the COVID-19 pandemic might change trends in cardiovascular health have been the subject of numerous ideas. People with COVID-19 have a worse prognosis when they have established CVD and atherosclerosis cardiovascular disease risk factors.

Therefore, covid had a great impact on cardiovascular diseases and increased the overall disease rate.

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Water spinning in a turbine has Kinetic energy.

We must exert force on an object to accelerate it. We have to put up the effort to use force. Energy is transmitted when work is done on an object, and the thing then moves at a new, constant speed. The energy that is transported is referred to as kinetic energy, and it is influenced by the mass and speed attained.

In physics, kinetic energy is described as follows:

The amount of labor an object can accomplish through motion is measured by its kinetic energy.

As a scalar quantity, kinetic energy can only be fully defined by its magnitude.

Water spinning in a turbine has kinetic energy which is used to produced electric energy.

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Electron degeneracy pressure is a specific manifestation of the more general occurrence of quantum degeneracy pressure.

Electron degeneracy pressure will halt the gravitational slump of a star if its mass is below the Chandrasekhar limit (1.44 solar masses). This is the pressure that averts a white dwarf star from collapsing. Electron degeneracy pressure occurs when electrons are squeezed into a very small volume. Since their positions are well-known, they gain a large momentum in obedience to Heisenberg's uncertainty principle. This momentum generates a pressure that is temperature-independent and can result in helium flash. in stars. Electron degeneracy occurs at a solidity of about 106 kg/m3.

So we can conclude that  The electron degeneracy pressure is taken by (n.v.p) where n is the number density, and v is the mean speed of the degenerate electrons.

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Answer:

21.4 m/s

Explanation:

Momentum = m * v

           15 kg  m/s  =  .7  *  v

  v = 15/.7 = 21.4 m/s

Answer:

Electrons.

Explanation:

Neutrons are neutral particles found in the nucleus. The atomic mass is calculated using the protons and neutrons but not the electrons, as their mass is negligible. In an example, the element oxygen has an atomic number of 8 and an atomic mass of 16.

Answer:

D

Explanation:

bike and road show equal and oppisite reaction

The tension in each string if a 60 kg is suspended from two cables which makes 30° and 45° angle with the vertical is 429.2 N to the left and 302.25 N to the right.

m = 60 kg

Resolving the tension force of 30° string into its horizontal and vertical components

Tx = T1 sin θ

Tx = T1 sin 30°

Tx = 0.5 T1

Ty = T1 cos θ

Ty = T1 cos 30°

Ty = 0.87 T1

Resolving the tension force of 45° string into its horizontal and vertical components

Tx = T2 sin θ

Tx = T2 sin 45°

Tx = 0.71 T2

Ty = T2 cos θ

Ty = T2 cos 45°

Ty = 0.71 T2

∑Fx = 0

- 0.5 T1 + 0.71 T2 = 0    → ( 1 )

∑Fy = 0

0.87 T1 + 0.71 T2 - m g = 0

0.87 T1 + 0.71 T2 - ( 60 * 9.8 ) = 0

0.87 T1 + 0.71 T2 - 588 = 0     → ( 2 )

( 2 ) - ( 1 ),

1.37 T1 - 588 = 0

T1 = 588 / 1.37

T1 = 429.2 N

Sub T1 in ( 1 ),

( - 0.5 * 429.2 ) + 0.71 T2 = 0

- 214.6 + 0.71 T2 = 0

T2 = 214.6 / 0.71

T2 = 302.25 N

Therefore, the tension in each string is 429.2 N to the left and 302.25 N to the right.

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A wire is capable of carrying a load W without snapping. It is divided in half, equally. Each component's maximum load capacity is W.

The maximum load supported by the cable is directly proportional to the breaking stress.

Since,

Breaking stress=F/A

where F is the force and A is the cross-sectional area

As we see that the breaking stress is independent of the length of the cable. So, if the cable is cut in two equal parts, the maximum load that can be supported by either part of the cable remains the same as before.

So, the answer would be W.

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The correct answer is momentum of boy = 225 Kg. m /s

What is momentum?

Momentum is the product of the units of mass and velocity is the unit of Momentum.

To get the value the momentum,  formula: P=mv, where P is the momentum.

Given, total mass and boy = 45 Kg., Velocity = -5 m/s

Momentum = Mass x Velocity = 45 Kg.  x 5 m/s = 225 Kg. m / s

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The length of the spring during the motion is 16.875 cm

We'll begin by obtaining the velocity during the first 1.60 s. This is illustrated as follow:

Velocity = distance / time

Velocity = 0.96 / 1.6

Velocity = 0.6 m/s

Next, we shall determine the acceleration.

a = (v – u) / t

a = (0.6 – 0) / 1.6

a = 0.6 / 1.6

a = 0.375 m/s²

Next, we shall determine the force.

Mass (m) = 12.5 kg

Acceleration (a) = 0.375 m/s²

Force (F) =?

Force = mass × acceleration

Force = 12.5 × 0.375

F = 4.6875 N

Next, we shall determine the extension of the spring.

F = Ke

Divide both sides by K

e = F / K

e = 4.6875 / 2.5

e = 1.875 cm

Finally, we shall dtermin the length of the spring. This can be obtained as follow:

Length of spring = 15 + 1.875

Length of spring = 16.875 cm

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The final temperature of the mixture or the equilibrium temperature of the mixture is 4.4⁰C.

option E is the correct answer.

The final temperature of the mixture or the equilibrium temperature of the mixture is determined by applying the principle of conservation of energy.

Heat lost by the lead = Heat gained by the water

m₁c₁(T₁ - T) = m₂c₂(T - T₂)

where;

0.3 x 128 x (100 - T) = 0.2 x 4200 x (T - 0)

3840 - 38.4T = 840T

3840 = 878.4T

T = 3840/878.4

T = 4.4⁰C

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Answer: series circuit

Explanation:

First 2 answers are garbage.  In Parallel circuits electrons have 2 or more paths to follow.  In Series circuits, there is only one path.

Answer:2,520

Explanation: The truck goes 14 meters per second

Since it is traveling for 3 minutes which is 180 seconds, all you need to do is times the 180 seconds with the 14 meters. :)

Answer:

b) Convection

Explanation:

An air conditioner cools a room using convection method. Therefore, the option (b) is the correct answer.

The acceleration of the boxcar is 5.586m/s².

We refer to any process where the velocity changes as acceleration. You can only accelerate by changing your speed, direction, or both since velocity is a function of both speed and direction.

Positive acceleration is a property of objects that are accelerating and moving in the right direction. In the first illustration, positive acceleration was demonstrated by the moving car. The acceleration is occurring in the same direction that the vehicle is moving forward and accelerating.

θ = ma/mg

tanθ = a/g

a = tanθ g

a = tan 30×9.8

a = 0.57×9.8

a = 5.586m/s².

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equal to 9380 into 10. To the power three m. T is equal to 2.77 into 10 to the power of four seconds. So the expression for finding the mass of mars as the Squire divided by r cube as equal to four Pi Square divided by G into em. So M will be equal to for by Squire. Our cue divided by G. The Squire. So now we can substitute the values That does four by Squire. indu 9380 into 10. to the power three all cube divided by Value of GS 6.67, 3 into 10 to the Power -11. Indu 2.77 into 10 to the power of four all Squire. By solving this, we will get the mosque as six point 363 into 10. to the power 23 kilogram

The statement that the sailboat ends up seven miles to the west is true because that it depicts displacement, a vector quantity.

The vector quantity known as displacement stands for distance with a directional component. As a result, displacement is defined as a distance and a direction.

Contrarily, distance is the amount of space between two locations, typically those that are geographical, and is typically (though not always) measured along a straight line. It has no direction because it is a scalar quantity.

The primary distinction between the two terms is as follows: A scalar quantity known as distance measures "how much ground an object has traversed" while moving.

The answer to this query places a sailboat 7 miles west of a pier. This indicates displacement because the magnitude is 7 and the direction is west of the pier.

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The motional EMF produced by the rod is 5.474 × 10⁻⁶ V.

When no current is flowing, electromotive force (EMF) equals the terminal potential difference.

Despite the fact that both EMF and terminal potential difference (V) are expressed in volts, they are not the same thing. EMF is the quantity of energy (E) that the battery supplies to each coulomb of charge (Q) that passes through.

Given parameters:

The earth’s magnetic field; B= 3.5 × 10⁻⁵ T

The length of the rod; l = 0.23 m.

Speed of the rod; v = 0.68 m/s.

So, the motional EMF produced by the rod = Blv

= 3.5 × 10⁻⁵ × 0.23 × 0.68

= 5.474 × 10⁻⁶ V.

Hence, motional EMF produced by the rod is 5.474 × 10⁻⁶ V.

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Potential energy is lost as the skier starts to descend the hill, while kinetic energy, or the energy of motion, is gained. The skier increases her speed as she decreases height (and thereby potential energy) (and thus gains kinetic energy).

Mass and speed are the two main determinants of kinetic energy. Because an object's motion is influenced by its velocity as well as its mass, though mass is the more crucial factor.

You are working against inertia when you accelerate an object. The change in the object's kinetic energy is equal to that work. Starting with the common equation for work against inertia, it is possible to prove that the relationship exists.

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The angular velocity, in rad/s, of the two after the collision is 28.7 rad/s.

The angular velocity, in rad/s, of the two after the collision is determined by applying principle of conservation of angular momentum as follows;

I₁ω₁ = I₂ω₂

where;

Initial moment of inertia of the rod is calculated as follows;

I₁ = ¹/₃ML²

where;

I₁ = ¹/₃ x 1.4 x (1.2²)

I₁ = 0.67 kgm²

Final moment of inertia of the rod is calculated as;

I₂ = ¹/₃ x (1.4 + 0.038) x (1.2²)

I₂ = 0.69 kgm²

I₁ω₁ = I₂ω₂

0.67(0 + 35.5/1.2) = 0.69ω₂

19.82 = 0.69ω₂

ω₂ = 19.82/0.69

ω₂ = 28.7 rad/s

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We have the following from the question;

The coefficient of linear expansion is 8.6 * 10^-5

The coefficient of superficial expression is 1.72 * 8.6 * 10^-4

The coefficient of cubical expansion is  2.5  * 10^-4

Let us recall that the term linear expansivity has to do with the increase in length, per unit length, per degree Kelvin rise in temperature. Now we know that we have the following information from the question;

Initial length =  6cm

Increase in length = 0.3cm

Initial temperature = 20 degree Celsius

Final temperature =  600 degree Celsius

We then have;

coefficient of linear expansion = e/[tex]l_{1}[/tex]([tex]T_{2}[/tex] - [tex]T_{1}[/tex])

e = extension

[tex]l_{1}[/tex] = initial length

[tex]T_{2}[/tex] = Final temperature

[tex]T_{1}[/tex] = initial temperature

coefficient of linear expansion = 0.3/6(600 - 20)

= 8.6 * 10^-5

coefficient of superficial expression = 2( 8.6 * 10^-5)

= 1.72 * 8.6 * 10^-4

coefficient of cubical expansion = 3(8.6 * 10^-5)

= 2.5  * 10^-4

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The distance that the log has moved till it got to where Ernie reached Burt  would be 0.37m

We have the following details that would be used to get the solution to this problem

length of log = 4. 0 m

The mass of the log is 210 kg

The weight pof Burt = 40 . 5 kg

The weight of ernie would be 25.5 kg

The formula to be used would be in the form of

x(mass of log) + x(mass of Burt) + mass of ernie (x - length of wood)

such that we would have

210x + 40.5x + 25.5(x - 4) = 0

210x + 40.5x + 25.5x - 102 = 0

276x - 102 = 0

cross sign to the other side

276x = 102

To get the distance we would have to divide through by 276 and this value that we would get is going to be the x value

276x / 276 = 102 / 276

x = 0.369

~ 0.37m

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