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3 years ago

Statement A: Area of a rectangle with measured length = 2.536 mm and width = 1.4 mm.

Physics

1 answer:

pochemuha3 years ago

7 0

Explanation:

Formula for calculating the area of a rectangle A = Length *width

For statement A;

Given area of a rectangle with measured length = 2.536 mm and width = 1.4 mm.

Area of the rectangle = 2.536mm * 1.4mm

Area of the rectangle = 3.5504mm²

The rule of significant figures states that we should always convert the answer to the least number of significant figure amount the given value in question. Since 1.4mm has 2 significant figure, hence we will convert our answer to 2 significant figure.

Area of the rectangle = 3.6mm² (to 2sf)

For statement B;

Given area of a rectangle with measured length = 2.536 mm and width = 1.41 mm.

Area of the rectangle = 2.536mm * 1.41mm

Area of the rectangle = 3.57576mm²

Similarly, Since 1.41mm has 3 significant figure compare to 2.536 that has 4sf, hence we will convert our answer to 3 significant figure.

Area of the rectangle = 3.58mm² (to 3sf)

Based on the conversion, it can be seen that 3.6mm² is greater than 3.58mm², hence the area of rectangle in statement A is greater than the area of the rectangle in statement B.

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Define resistance and describe what would happen to a light bulb if the voltage increased but the resistance stayed the same.

Sveta_85 [38]

Well, to be broken down, resistance is the opposition that a substance offers to the flow of an electric current.

What would happen to a light bulb if the voltage increased, but the resistance stayed the same would be this:
The current, being directly proportional to the voltage, would increase, causing the light bulb to increase I'm brilliance, which means: it would simply become brighter.

Hope I helped you out!

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3 years ago

A 55.0-gram lead bullet hits a steel plate, both initially at 24 °C. The bullet melts and splatters on impact. Assuming that the

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Answer:

v = 609 m/s

Explanation:

mass of lead bullet, m = 55 g

T1 = 24°C

T2 = 327°C

Let v be the velocity

kinetic energy of bullet

K = 1/2 mv^2 = 0.5 x 0.055 x v^2

72 % of kinetic energy is used to melt the lead bullet .

Heat gained by lead = m x c x ΔT + m x L

where, c be the specific heat of lead and L be the latent heat of lead

c = 536 J/kg°C

L = 23000 J/kg

0.0275 x v^2 = 0.055 (536 x 303 + 23000)

v = 608.9 m/s

v = 609 m/s

Explanation:

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4 years ago

In the nucleus of all atoms are sub-atomic particles called protons and neutrons. all protons have a positive charge. since all

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Protons stay close together in the nucleus because the strong nuclear force.

There are four natural elemental forces: 1) gravity, 2) electromagnetic force, 3) weak nuclear force, and 4) strong nuclear force.

Gravity is an attractive force. It acts at long distance and is proportion to the product of the masses. It is not relevant in the nucleous of an atoms because the masses are tiny.

Electrotmagnetic force may be attractive or repulsive. Indeed, as stated since the protons have all positive charge, this force is repulsive, and you could expect that they the protons cannot stand so close to each other in the nucleous.

Strong nuclear force is the strongest of the four forces in nature and acts only to very short distances. It is the atractive force between the partilces in the atom nuclei. This force overcomes the electromagnetic repulsion between the protons. This force is responsible for keeping the protons and the neutrons together in the nuclei.

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4 years ago

A wire 25.0cm long lies along the z-axis and carries a current of 9.00A in the positive +z-direction. The magnetic field is unif

marysya [2.9K]

The expression of the magnetic force and solving the determinant allows to shorten the result for the value of the magnetic force are:

In Cartesian form F = 2.46 i ^ - 0.605 j ^

In the form of magnitude and direction F = 2.53 N and θ = 346.2º

Given parameters.

Length of the wire on the z axis is: L = 25.0 cm = 0.25 m.

The current i = 9.00 A in the positive direction of the z axis.

The magnetic field B = (-0.242 i ^ - 0.985 j ^ -0.336 k ^ ) T

To find.

Magnetic force.

The magnetic force on a wire carrying a current is the vector product of the direction of the current and the magnetic field.

F = i L x B

Where the bold letters indicate vectors, F is the force, i the current, L a vector pointing in the direction of the current and B the magnetic field.

The best way to find the force is to solve the determinant, in general, a vector (L) is written in the form of the module times a <em>unit vector</em>.

$F= i |L| \left[\begin{array}{ccc}i&j&k\\L_x&L_y&L_z\\B_x&B_y&B_z\end{array}\right]$

Let's calculate.

$F= 9.00 \ 0.25 \ \left[\begin{array}{ccc}i&j&k\\0&0&1\\-0.242&-0.985&-0.336\end{array}\right]$

$F = 2.26 \ ( - 1 B_y i \ + 1 B_x j \ )$

F = 2.5 (0.985 i ^ - 0.242 j ^)

F = ( 2.46 i ^ - 0.605 j^ ) N

To find the magnitude we use the Pythagorean theorem.

F = $\sqrt{F_x^2 + F_y^2}$

F = $\sqrt{2.46^2 + 0.605^2}$

F = 2.53 N

Let's use trigonometry for the direction.

Tan θ ’= $\frac{F_y}{F_x}$

θ'= tan⁻¹ $\frac{F_y}{F_x}$

θ'= tan⁻¹1 ( $\frac{-.605}{2.46}$ )

θ’= -13.8º

To measure this angle from the positive side of the x-axis counterclockwise.

θ = 360- θ'

θ = 360 - 13.8

θ = 346.2º

In conclusion using the expression of the magnetic force and solving the determinant we can shorten the result for the value of the force are:

In Cartesian form F = 2.46 i ^ - 0.605 j ^

In the form of magnitude and direction F = 2.53 N and θ = 346.2º

Learn more here: brainly.com/question/2630590

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3 years ago