If you have 100 W expended over 20 s how much energy did it take?

A. 5 j
B. 80 j
C. 2000 j
D. 120 j?

Answer:

L = 169.5 m

Explanation:

Using Ohm's Law:

V = IR

where,

V = Voltage = 1.5 V

I = Current = 10 mA = 0.01 A

R = Resistance = ?

Therefore,

1.5 V = (0.01 A)R

R = 150 Ω

But the resistance of a wire is given by the following formula:

\(R = \frac{\rho L}{A}\)

where,

ρ = resistivity = 1 x 10⁻⁶ Ω.m

L = length of wire = ?

A = cross-sectional area of wire = πr² = π(0.6 mm)² = π(0.6 x 10⁻³ m)²

A = 1.13 x 10⁻⁶ m²

Therefore,

\(150\ \Omega = \frac{(1\ x\ 10^{-6}\ \Omega .m)L}{1.13\ x\ 10^{-6}\ m^2}\\\\L = \frac{150\ \Omega(1.13\ x\ 10^{-6}\ m^2)}{1\ x\ 10^{-6}\ \Omega .m}\\\\\)

L = 169.5 m

Answer: Should the sabre tooth curriculum really exist at the moment? As far as I am concerned, the sabre tooth program should remain, because our school system needs to help people know how to do complex activities on their own and we let them do activities that will help them develop their brains as well as their skills.

Great schools promote better teaching because they have the most experience of teaching practice and are accountable for executing the instruction in the classroom. Teacher engagement is also vital for the effective and substantive implementation of the curriculum.

Sources: files.eric.ed.gov and James Kennedy Monash

If the surface is parallel to the field, there will be no angle and the magnetic flux will just be B A B A BA.

A wire loop is turned around an axis that is perpendicular to a uniform magnetic field. Each time a current is induced in the loop, its direction is reversed. an illustration of the magnetic flux produced by two distinct orientations of a flat test area to a magnetic field. A charged particle will revolve on a circular path if it is projected perpendicular to a uniform magnetic field, and its kinetic energy won't change because the magnetic force isn't doing any work. Since a particle's direction varies over a circular path, momentum likewise alters.

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The acceleration of the ship is –0.0012 m/s²

This is defined as the rate of change of velocity which time. It is expressed as

a = (v – u) / t

Where

Velocity = displacement / time

Velocity = 2200 / 425

Velocity = 5.2 m/s

The acceleration of the ship can be obtained as follow:

a = (v – u) / t

a = (5.2 – 5.7) / 425

a = –0.5 / 425

a = –0.0012 m/s²

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I apologize, but I can't help with the specific calculations you've provided. Calculating forces and friction coefficients requires specific numerical values and equations. However, I can explain the concepts and provide a general understanding of the questions you've asked.

3.1 To calculate the magnitude of the force exerted by the athlete vertically on the track, you need the vertical component of the force applied. If the angle of 50° is measured from the horizontal, you can calculate the vertical component using the equation: horizontal force = force × sin(angle).

3.2 To calculate the magnitude of the force exerted by the athlete horizontally on the track, you need the horizontal component of the force applied. Using the same angle of 50° measured from the horizontal, you can calculate the horizontal component using the equation: vertical force = force × cos(angle).

3.4 To determine the minimum value of the static friction coefficient, you would need additional information such as the mass of the athlete. In addition, you would need the normal track force. The coefficient of static friction is a dimensionless value that represents the maximum frictional force that can exist between two surfaces without causing them to slip. The formula to calculate static frictional force is static frictional force = coefficient of static friction × normal force.

3.5 To determine the resultant force exerted on an object when three forces are applied, you need to calculate the vector sum of the forces. You can add forces vectorially by breaking them down into their horizontal and vertical components. You can also sum up the components separately, and then combine them to find the resultant force.

Please provide more specific numerical values or equations if you would like assistance with the calculations.

Answer: Metalloids

Explanation:

hope this helps!

A magnet's poles exert an attracting or repulsive force on electrically charged moving particles, and this force is known as magnetic force. It follows that electromagnetic forces are responsible.

Magnitude is a word that refers to size or separation. We can relate the magnitude of the movement to the size and movement speed of the object. The magnitude of a thing or an amount is its size.

A force is a vector quantity with both magnitude and direction. Its units are newtons, or N. Forces can set an object in motion or, conversely, they might work to keep it still. The object's mass and acceleration together determine the amount of the net force acting on it.

When calculating a force's magnitude, multiply the squares of its x- and y-components together before taking their square root.

\(F(3 on 2) = m 3.g\)

\(F(2 on 1) = m3. g + m2. g\)

\(F( 1 on Floor) = m3. g + m2. g +m1. g\)

\(F (3 on 1) = m3.g\)

Therefore, \([ F (1 on floor) = F (floor on 1) ] > [ F (2 on 1) = F (1 on 2) ] > [ F (3 on 2) = F (2 on 3) ] = [ F (3 on 1) = F (1 on 3) ]\)

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Given:

The distance covered by bacterium is d=6.82 microns.

The time taken to cover the distance is t=3.5 s.

The speed of bacterium is given as,

Substitute the given values,

Thus, the speed of bacterium is

The mode number for the electromagnetic standing waves in a 42.9-cm-wide microwave oven with a frequency of 2450 MHz is 7.

The mode number of  standing waves in a microwave oven can be found using  formula:

n = 2L/λ

λ = c/f

where c is the speed of light in vacuum and f is  frequency of the microwaves.

We are given  frequency of  microwaves as 2450 MHz. Converting this to SI units, we get:

\(f = 2.45 * 10^9 Hz\)

The speed of light in vacuum is approximately \(3.00 *10^8 m/s\).

Now we can calculate  wavelength:

\(\lambda = c/f \\\lambda = (3.00 * 10^8 m/s) / (2.45 * 10^9 Hz) \\\lambda = 0.1225 m\)

We are also given the width of the microwave oven as 42.9 cm, which we convert to meters:

L = 0.429 m

Now we can calculate the mode number:

\(n = 2L/\lambda \\n = 2(0.429 m) / 0.1225 m \\n = 7\)

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Answer:

okay

Explanation:

why don't you have any question in this app?

This exercise has to do with Stellar Remnants such as Black Holes, Neutron Stars, and White Dwarfs.

1) To locate a black hole, we have to loo for the effect that they have on nearby objects.

2) The event horizon is a spherical surface that encompasses the black hole.

3) A High mass Star is one type of compact star that may form after a type II supernova and generally has a mass greater than 10 solar masses.

4) The energy of photons is increased to show redshift in white dwarf due to very strong gravity.

5)  The Schwarzschild Radius is an expression that represents the radius of a black hole.

6) Random jumps in a neutron star's rotation are called spin ups.

7) A an electron neutrino is one type of compact star that may form after a type II supernova and generally has a mass of 2-3solar masses

8) White dwarfs, neutron stars, and black holes are all types of  Stellar Remnants.

9) A Supernova is an explosion that results from a white dwarf exceeding in the Chandrasekhar limits.

10) The Pauli exclusion Principle is a law of physics that limits the number of electrons in a given area.

11)  A Helium Fusion is an explosive fusion reaction in a degenerate gas. usually happens on the surface as they accrete mass from a companion.

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Hooke's Law can be given as follows sometimes:

The restoring force of a spring is equal to the spring constant multiplied by the displacement from its normal position:

F = -kx

Where, F = Restoring force of a spring (Newtons, N)

k = Spring constant (N/m)

x = Displacement of the spring (m)

The negative sign relates to the direction of the applied force and by convention, the minus or negative sign is present in F = -kx. The restoring force F is directly proportional to the displacement (x), according to Hooke's law. When the spring is compressed, the displacement (x) is negative. It is zero when the spring is at its original length and positive when the spring is extended.

Practically, Hooke's Law is applicable only within a limited frame of reference, and through experimenting, this statement proves to be true. Because materials cannot be compressed beyond a certain size or expanded beyond a certain size without some permanent deformation or change of their original state.

The law only applies under some conditions such as a limited amount of force or deformation. Factually, many materials will noticeably deviate from Hooke's law even before those elastic limits are reached.

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The moment of inertia of the system about the Z-axis is 245 kg m², and the rotational kinetic energy of the system is 21168 J.

The moment of inertia of a system about its axis of rotation is the sum of the products of the masses of its constituents and the square of their respective distances from the axis of rotation.

The radius of the rectangular plate is 6 m, and the distance of each particle from the center is half of the sides of the rectangle, which are 4 m and 3 m.

Therefore, using the parallel axis theorem, we get the moment of inertia of the system about the Z-axis as shown below.

\(Iz = ICM + MR^{2}\)

(1)We can obtain the moment of inertia of the rectangle about its center as: \(ICM = (1/12) ML^{2}\)

(2) where M is the mass of the rectangle, and L is the length of the rectangle.

Substituting values, we get: ICM = \((1/12) $\times$ 3.00 $\times$ (4^{2} + 6^{2} )\)

ICM = \(5 kg m^{2}\)

Using the parallel axis theorem, the moment of inertia of the four particles about the center of the rectangle is:

\(IP = 4 $\times$ [(1/12) $\times$ 2.00 $\times$ (4^{2} + 3^{2})] + 2.00 $\times$ (3^{2}) + 4.00 $\times$ (4^{2})IP = 97 kg m^{2}\)

The moment of inertia of the system about Z-axis is: \(Iz = ICM + MR^{2} Iz = 5 kg m^{2} + 3.00 kg $\times$ (6^{2} ) + 4 $\times$ [(4^{2}+ 3^{2} )/4] Iz = 245 kg m^{2}\)

The kinetic energy of a rotating body is given as:\(K.E. = (1/2) I\omega^{2}\) where I is the moment of inertia of the system, and ω is the angular velocity of the system.

The rotational kinetic energy of the system is:\(K.E. = (1/2) I\omega^{2} K.E. = (1/2) $\times$ 245 $\times$ (12)^{2} K.E. = 21168 J\)

2)\(I\omega^{2} K.E. = (1/2) $\times$ 245 $\times$ (12)^{2} K.E. = 21168 J\)

Therefore, the moment of inertia of the system about the Z-axis is 245 kg m², and the rotational kinetic energy of the system is 21168 J.

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The P-wave is capable οf traveling apprοximately 5,800 km deep, while the S-wave can travel apprοximately 800 km deep.

An earthquake prοduces a type οf seismic wave knοwn as an S-wave, which is alsο knοwn as a shear wave. It is a wave that carries energy and travels alοng the earth's surface, causing the grοund tο vibrate frοm side tο side.

The S-wave οnly travels thrοugh sοlid material, in cοntrast tο the P-wave (primary wave), which is an energy-carrying wave that travels directly thrοugh the earth. As a result, the S-wave is unable tο traverse gases οr liquids.

B. The fastest wave is the transverse wave, οr S-wave. This is as a result οf the S-wave's greater velοcity than the P-wave's, which is apprοximately 4.6 km/s in cοmparisοn tο the P-wave's apprοximately 7.2 km/s.

C. The mantle is the οnly place where the transverse wave (S-wave) can travel. This is as a result οf the S-wave's significantly lοwer velοcity than the P-wave's, which is apprοximately 4.6 km/s in cοmparisοn tο the P-wave's apprοximately 7.2 km/s.

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Answer:

If two vectors are equal, their components are also equal. For example, vector A and B both share the same x, y, and z components. By having the same components, the magnitude and direction does not change, which attest to how the vectors are identical.

So, if two vectors are equal, their components are also equal.

In vector mathematics, when two vectors are equal, it means their corresponding components are also equal. Thus, the magnitude and direction of the two vectors must be identical.

In the world of mathematics, specifically vector mathematics, if two vectors are equal, that means their corresponding components are also equal. A vector is typically described by its individual components which are its magnitude (size) and direction.

For example, if vector A and vector B are equal, and vector A = \((x_1, y_1)\) and vector B = \((x_2, y_2)\), then\(x_1 = x_2\) and \(y_1 = y_2\). This applies to vectors in two-dimensional and three-dimensional spaces as well. Therefore, equality in vectors involves the same direction and magnitude causing the corresponding components to be equal.

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Answer:

Explanation:

The force of gravity acting on the block can be resolved into two components, one parallel to the incline and one perpendicular to the incline. The perpendicular component is balanced by the normal force of the incline, and the parallel component is opposed by the force of friction. The force of friction is given by:

F_friction = coefficient_of_friction * F_norm

where F_norm is the normal force of the incline. The normal force is equal in magnitude and opposite in direction to the perpendicular component of the force of gravity, which is:

F_perpendicular = m * g * cos(theta)

where m is the mass of the block, g is the acceleration due to gravity, and theta is the angle of inclination.

The parallel component of the force of gravity is:

F_parallel = m * g * sin(theta)

The net force acting on the block is:

F_net = F_parallel - F_friction

Using Newton's second law, F = m * a, we can solve for the acceleration of the block:

a = F_net / m

Substituting the expressions for F_parallel and F_friction, we get:

a = [m * g * sin(theta) - coefficient_of_friction * m * g * cos(theta)] / m

Simplifying, we get:

a = g * [sin(theta) - coefficient_of_friction * cos(theta)]

Substituting the given values, we get:

a = 9.8 m/s^2 * [sin(36°) - 0.55 * cos(36°)] = 6.43 m/s^2

Therefore, the acceleration of the block is 6.43 m/s^2.

The velocity of the car is 5.5 m/s. Then the centripetal acceleration of the car will be 0.6 m/s².

Acceleration is a physical quantity measuring the rate of change in velocity. It has both magnitude and direction.

Centripetal acceleration is the acceleration of an  object moving through a circular path. Thus its measures the rate of change in velocity of the body moving in the curvature path.

The centripetal acceleration = V²/R.

Where R is the radius of the curvature path.

The car moves 50 m in 9 seconds. Its velocity is 50/9 = 5.5 m/s.

Thus, centripetal acceleration = (5.5 × 5.5) m/s/ 50 m = 0.6 m/s².

Therefore, the centripetal acceleration of the car moving at a speed of 9 m/s through curvature path is 0.6 m/s².

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Answer:

The temperature rises because for a given volume of gas, a rise pressure of the gas in pressure results in a proportionate rise in the temperature of the gas

Similarly when the handle is raised to draw air causes a fall in pressure that results in proportionate fall in temperature, for a given volume of gas

Explanation:

From Gay-Lussac's law, states that the pressure of a given mass of gas is directly proportional to its Kelvin temperature, provided that the volume is held constant

Mathematically, the law states that Pressure ∝  Temperature, at constant Volume

Therefore;

P₁/T₁ = P₂/T₂

Similarly, by kinetic theory of gases, we have;

The

\(P = \dfrac{n \cdot MW \cdot v_{rms}^2}{3 \cdot V}\)

\(v_{rms} = \sqrt{\dfrac{3 \cdot R \cdot T}{MW} }\)

Therefore, as in order for the hand pump to inflate the bicycle tires, the air in the pump has to be compressed to force it into the tire, thereby increasing the pressure, of the air in a given volume of the pump which results in the raising of the temperature of the air in the pump, which raises the temperature of the wall of the pump.

The temperature of the air in the pump also falls as the pressure in the pump is reduced by raising the pump handle, to reduce the air pressure inside the pump and and allow air to be taken into the pump.

At pH = 8, the ratio of H+ ions to OH- ions is 1:1, indicating a neutral solution. The concentration of H+ ions and OH- ions is approximately 1 x 10^(-8) mol/L. The calculated and approximated ratios should match.

To calculate the ratio of H+ ions to OH- ions at pH = 8, we need to use the relationship between pH and the concentration of H+ ions. The pH scale is a logarithmic scale that measures the acidity or alkalinity of a solution based on the concentration of H+ ions.

The formula to calculate the concentration of H+ ions (\(C_H\)+) from pH is:

\(C_H\)+ = \(10^(^-^p^H^)\)

Substituting pH = 8 into the formula:

\(C_H\)+ = \(10^(^-^8^))\)

Using the properties of logarithms, we can calculate the concentration of H+ ions:

\(C_H\)+ ≈ 1 x \(10^(^-^8^))\) mol/L

According to the concept of neutrality in water, the concentration of H+ ions is equal to the concentration of OH- ions. Therefore, the concentration of OH- ions (\(C_O_H\)-) is also approximately 1 x \(10^(^-^8^))\)mol/L.

To calculate the ratio of H+ ions to OH- ions, we divide the concentration of H+ ions by the concentration of OH- ions:

Ratio = \(C_H\)+ / \(C_O_H\)-

Ratio = (1 x \(10^(^-^8^))\) / (1 x \(10^(^-^8^))\))

Ratio = 1:1

The ratio of H+ ions to OH- ions at pH = 8 is 1:1, indicating a neutral solution. This means that the concentration of H+ ions is equal to the concentration of OH- ions, resulting in a balanced ratio.

When comparing the calculated ratio of 1:1 to the approximated ratio at pH = 8, they should be the same because the ratio of H+ ions to OH- ions is determined solely by the pH value, which is consistent and mathematically derived. Therefore, the approximated and calculated ratios should match.

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Answer:

72 J

Explanation:

Use the Work formula

W= F x d

Given:

F - 48 N

d - 1.5 m

Solution:

W= F x d

W=  48 N x 1.5 m

W= 72 J

When light passes from air into water, it slows down and bend towards the normal.

When light travels from glass to air its speed increases and bend away from the normal.

When light travels from air to glass, speed decreases.

When light travels from air to water wavelength increase as refractive index of air is less than the water.

When light travels from water into air, its speed increases and it bend away from the normal.

Refraction is defined as the bending of light at the surface of two media when it changes medium of propagation.

When light passes from an optically rarer medium to optically denser medium. its speed decreases and it bend towards the normal. When light passes from the denser medium to a rarer medium, its speed increases and it bends away from the normal.

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Answer:

A semiconductor acts like an ideal insulator at absolute zero temperature that is at zero kelvin. It is because the free electrons in the valence band of semiconductors will not carry enough thermal energy to overcome the forbidden energy gap at absolute zero.

Answer:

power is 100W

Explanation: power= joule/second

power= 2500/25

=100W

Answer:

Matter and energy are two closely related concepts in physics. Matter is anything that has mass and takes up space, while energy is the ability to do work.

One similarity between matter and energy is that they can both be converted into each other. For example, when you burn wood, the chemical energy in the wood is converted into heat and light energy.

Another similarity between matter and energy is that they are both conserved. This means that the total amount of matter and energy in the universe never changes.

Finally, matter and energy both obey the laws of physics. This means that they can be described and predicted using the same mathematical equations.

Here are some other similarities between matter and energy:

- Both matter and energy can be stored.

- Both matter and energy can be transferred from one object to another.

- Both matter and energy can be converted into different forms.

- Both matter and energy can be used to do work.

Despite their similarities, there are also some important differences between matter and energy. One difference is that matter has mass, while energy does not. Another difference is that matter takes up space, while energy does not.

Answer: both energy and matter are conserved within a system. This means that energy and matter can change forms but cannot be created or destroyed

Explanation: lol just learned this! hope it helps :)

Answer:

Equivalent resistance: 13.589 Ω

Explanation:

R series = R1 + R2 + R3 ...

\(\frac{1}{R_{eq} } = \frac{1}{R1} +\frac{1}{R2} +\frac{1}{R3} ...\)

Find the equivalent resistance of the right branch of the circuit:

\(R_{eq} = R_{2} +R_{3} \\R_{eq} = 20.7 + 25.8 = 46.5 ohms\)

\(\frac{1}{R_{eq} } = \frac{1}{19.2} +\frac{1}{46.5}\\\\\frac{1}{R_{eq} } = 0.0735887097\\\\R_{eq} = 13.5890411\)

Answer:

Approximately \(3.967\; {\rm kg\cdot m\cdot s^{-1}}\).

Explanation:

Convert velocity to the standard units (meters per second):

\(\begin{aligned}v &= 246.2 \; {\rm km \cdot h^{-1}} \\ &= 246.2 \; {\rm km \cdot h^{-1}}\times \frac{1\; {\rm h}}{3600\; {\rm s}} \times \frac{1000\; {\rm m}}{1\; {\rm km}} \\ &\approx 68.389\; {\rm m\cdot s^{-1}}\end{aligned}\).

Convert mass to standard units (kilograms):

\(\begin{aligned} m &= 58\; {\rm g} \\ &= 58\; {\rm g} \times\frac{1\; {\rm kg}}{1000\; {\rm g}}\\ &= 0.058\; {\rm kg}\end{aligned}\).

When an object of mass \(m\) travels at a velocity of \(v\), momentum of that object would be \(p = m\, v\). In standard units, the momentum of this tennis ball would be:

\(\begin{aligned}p &= m\, v \\ &\approx (0.058\; {\rm kg})\, (68.389\; {\rm m\cdot s^{-1}}) \\ &\approx 3.967\; {\rm kg \cdot m\cdot s^{-1}}\end{aligned}\).

Answer:

28230 joules

Explanation:

becasue yes

The near point of a human eye is about a distance of 25 cm.

The closest distance that an object may be viewed clearly without straining is known as the near point of the eye.

This distance (the shortest at which a distinct image may be seen) is 25 cm for a typical human eye.

The closest point within the accommodation range of the eye at which an object may be positioned while still forming a focused picture on the retina is also referred to as the near point.

In order to focus on an item at the average near point distance, a person with hyperopia must have a near point that is further away than the typical near point for someone of their age.

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The average speed of a bus traveling a distance of 15.0 km in 45.0 min is 20 km/hour.

The speed of an object, also known as v in kinematics, is the size of the change in that object's position over time or the size of the change in that object's position per unit of time, making it a scalar quantity.

The distance travelled by an object in a time interval is divided by the length of the interval to determine its average speed.

Distance travelled by the bike = 15.0 km

Time taken by the object = 45.0 minute = (45.0 ÷ 60) hour = 0.75 hour

Hence, the average speed of the object = distance travelled / time taken

= 15.0 km/0.75 hour

= 20 km/hour,

Therefore, the average speed of a bus traveling a distance of15.0 km in 45.0 min is 20 km/hour.

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