1. If all other things remain equal, which of the following changes to a closed circuit would result in increased resistance to the flow of electric current?
Correct Answer: A) Reducing the thickness of the conductor
B) Replacing the conductor with a more conductive material
Incorrect Response: C) Reducing the length of the conductor
D) Reducing the temperature of the conductor

2. What term refers to producing magnetism by placing a body within a magnetic field?
A) Polarization
B) Natural magnetism
C) Incorrect Response: Artificial magnetism
D) Correct Answer: Induced magnetism

3. What two things must exist for an electric current to be produced?
A) A negatively charged electrode and a positively charged electrode
B) Incorrect Response: A pair of highly conductive materials and a conducting path between them
C) Correct Answer: An electric potential between two bodies and a conducting path joining the bodies
D) A source of voltage and an open circuit

4. If all other things remain equal, which of the following changes to a closed circuit would result in increased resistance to the flow of electric current?
A) Correct Answer: Reducing the thickness of the conductor
B) Replacing the conductor with a more conductive material
C) Incorrect Response: Reducing the length of the conductor
D) Reducing the temperature of the conductor

5. Three components in a parallel circuit have individual resistances of r1, r2, and r3. What formula can you use to determine the total resistance of the circuit?
A) 1/R= r1 + r2 + r3
B) Incorrect Response: R= 1/r1 + 1/r2 + 1/r3
C) Correct Answer: 1/R= 1/r1 + 1/r2 + 1/r3
D) R= r1 + r2 + r3

6. Which of the following materials commonly used in electronic devices is classified as a semiconductor?
A) Correct Answer: Silicon
B) Incorrect Response: Copper
C) Glass
D) Plastic

7. Which of the following explains why your hair stands on end when you rub it with a balloon?
A) The balloon creates friction, which sticks your hair to it.
B) Correct Answer: Electrons from your hair jump to the balloon, causing it to become negatively charged on one side.
C) Incorrect Response: Protons from your hair jump to the balloon, causing it to become negatively charged on one side.
D) Protons from the balloon jump to your hair, causing it to become negatively charged.

Answer:

\(0.361\ \text{m}\)

Explanation:

\(f_s\) = Frequency of source = 375 Hz

\(\Delta f\) = Difference between the maximum and minimum sound frequencies = 2.75 Hz

v = Speed of sound in air = 343 m/s

T = Time period = 1.8 s

\(v_m\) = Maximum speed of the microphone

We have the relation

\(\Delta f=2f_s\dfrac{v_m}{v}\\\Rightarrow v_m=\dfrac{\Delta fv}{2f_s}\\\Rightarrow v_m=\dfrac{2.75\times 343}{2\times 375}\\\Rightarrow v_m=1.26\ \text{m/s}\)

Amplitude is given by

\(A=\dfrac{v_mT}{2\pi}\\\Rightarrow A=\dfrac{1.26\times 1.8}{2\pi}\\\Rightarrow A=0.361\ \text{m}\)

The amplitude of the simple harmonic motion is \(0.361\ \text{m}\).

For the projectile motion of the stone a) The time taken T = 9.04s b) the angle of the projectile = 62.31° c) the Range attained R = 209.923m

A stone propelled from a catapult is an example of projectile motion.

Given, the initial velocity of the stone u = 50 m/s; This initial velocity with which the stone is thrown has two components 1) vertical \(u_{y}\) = u sinθ along the Y axis and 2) horizontal \(u_{x}\)=u cosθ along the X axis

where θ is the angle of projection

maximum vertical displacement or height attained by stone = H

(Use sign convention +ve for upwards and -ve for downwards)

a) equation for the maximum vertical height reached by a body during projectile motion   \(H=\frac{u^{2} sin^{2}\theta }{2g}\)      (1)

equation for the time of flight of projectile motion \(T=\frac{2usin\theta}{g}\)           (2)

Given H = displacement in the y direction = height attained = 100m

u =  initial velocity = 50m/s ; acceleration due to gravity g =9.8 m/\(s^{2}\)

using equation (1)

\(100=\frac{50^{2}sin^{2}\theta }{2*9.8}\)

⇒\(sin^{2} \theta= \frac{100*2*9.8}{50^{2} }\)

⇒sinθ\(=\sqrt{\frac{10*2*9.8}{50^{2} } }\)

⇒sinθ = 0.885437

⇒θ = \(sin^{-1} (0.885437)\)

⇒θ = 62.31°

Hence  from equation (2) time of flight

\(T=\frac{2*50*sin\theta}{9.8}\)

⇒\(T=\frac{2*50*0.885437}{9.8}\)

⇒T = 9.04 s

Time is taken T =9.04s

b) Angle of projectile θ = 62.31°

c) The range attained \(R=\frac{u^{2}sin2\theta }{g}\)

⇒\(R = \frac{50^{2}sin(2*62.31)}{9.8}\)

⇒R = \(\frac{50^{2}*0.8229}{9.8}\)

⇒R= 209.923m

horizontal range attained R= 209.923m

Components of a projectile motion:

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Answer:

Explanation: 6 m / s , with the center of the ball leaving the racquet horizontally 2 . 37 m above the court surface. The net is 12 m away and 0 . 90 m high.

Answer:

Un diafragma es una pieza de silicona o de goma reutilizable que cubre el cuello del útero. El diafragma se coloca dentro de la vagina con espermicida antes de tener relaciones sexuales para prevenir un embarazo. El diafragma es un dispositivo anticonceptivo que impide que los espermatozoides ingresen en el útero.

The correct graph should have a positive slope for the initial acceleration phase, a horizontal line for the constant velocity phase, and a negative slope for the deceleration phase.

To determine which graph represents the motion correctly, let's analyze the given information step by step.

The car starts from rest and accelerates at 1 m/s² for 2 seconds.

During this period, the velocity of the car increases linearly, as the acceleration is constant. Therefore, the graph representing this phase should be a straight line with a positive slope.

The car then continues at a constant velocity for 10 seconds.

Since the car maintains a constant velocity during this period, the graph representing this phase should be a horizontal line, indicating no change in velocity.

The car sees a tree blocking the road and applies brakes, decelerating at 1 m/s² until it comes to rest.

During this phase, the car's velocity decreases linearly due to the deceleration. Therefore, the graph representing this phase should be a straight line with a negative slope.

Based on this analysis, the correct graph should have a positive slope for the initial acceleration phase, a horizontal line for the constant velocity phase, and a negative slope for the deceleration phase.

Among the given options, the graph that represents the motion correctly is likely to be a graph that meets these criteria. However, since the options were not provided, I'm unable to directly identify the correct graph.

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Answer: The watermelon

Explanation: The watermelon has a larger mass than the rest of the three.

Answer:

9 ohms

Explanation:

P = V²/R

R = v²/p = 6²/4 = 36/4 = 9 ohms.

The resistance is 9 Ohm.

To find the resistance, we need to know about the power in term of resistance and voltage.

Thus, we can conclude that the resistance is 9 Ohm.

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\(O = Q/4PiR^{2}\) is the surface charge density, sigma, on the outer surface of the conducting sphere.

The load per group of a double surface area is defined as surface charge density. It is a measurement of how much electric charge accumulates on a surface. It is represented by the symbol, and the SI unit is Coulombs for each square meter, abbreviated  \(Cm^{2}\).

A surface charge is a non-zero electric charge on a two-dimensional surface. These electric fields are constrained here on the 2-D surface, and the bias voltage on the surface is described by surface charge density, which is measured even in coulombs per square meter.

Surface charge density is defined in electromagnetism also as the quantity of electric charge per unit length, volume, or surface area. surface charge is inverse to the conductor radius of curvature.

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The observer (point H) must be positioned to the right of the person and to the left of the lamppost, to the left of the person and to the right of the lamppost, or behind the lamppost to see the person obstructed by it.

To determine the possible positions of the observer (point H) relative to the mirror showcase, we need to consider the given information about the position of the person and the lamppost.

If the person is to the left of the lamppost (point C) as seen in the window, then the observer (point H) must be positioned to the right of the person and to the left of the lamppost. This is because the mirror will reflect the image of the person to the right, and the observer must be positioned to the right of the reflected image to see it.

If the person is to the right of the lamppost (point C) as seen in the window, then the observer (point H) must be positioned to the left of the person and to the right of the lamppost. This is because the mirror will reflect the image of the person to the left, and the observer must be positioned to the left of the reflected image to see it.

If the lamppost (point C) obstructs the view of the person as seen in the window, then the observer (point H) must be positioned behind the lamppost, either to the left or to the right of it. This is because the mirror will not be able to reflect the image of the person due to the obstruction caused by the lamppost.

In summary, the possible positions of the observer (point H) relative to the mirror showcase are:

To the right of the person and to the left of the lamppost, to see the person to the left of the lamppost. To the left of the person and to the right of the lamppost, to see the person to the right of the lamppost. To the left or right of the lamppost, behind it, to see the obstruction of the person caused by the lamppost.

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Complete question:

Using the given information, determine the possible positions of the observer (point H) relative to the mirror showcase such that the following are observed:

1 - The person is to the left of the lamppost (point C) as seen in the window.

2 - The person is to the right of the lamppost (point C) as seen in the window.

3 - The lamppost (point C) obstructs the view of the person as seen in the window.

Answer:

Freefall

Explanation:

Hi the answer is freefall, hope this helps :)

Answer:

The answer is D

Explanation:

A must always be taller than B  for the skateboarder to have just enough energy to complete the loop.

Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's center.

To cancel out gravitational acceleration at point  B, the skateboarder should have centripetal acceleration, that is, he should have some amount of kinetic energy.

Hence, from conservation of energy, it may be written that:

Potential energy at point A = (potential energy + kinetic energy) at point B

mgh₁ = mgh₂ + mv²/2

Hence, h₁ > h₂

That is, Height of A > height of B

Hence,  A must always be taller than B  for the skateboarder to have just enough energy to complete the loop.

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Answer:

Tim has a higher potential energy than Joe.

Explanation:

The higher an object or an organism is, the more potential energy it has

Answer:

values of gravitational force and gravitational constant become same or equal when product of masses involved equals the square of distance between them

Explanation:

Answer:

We know ForceF=mass×acceleration----------(1)

And given ForceF=

r

mv

2

----------(2)

Equating 1 and 2 dimensionaly we get ,

ma=

r

mv

2

MLT

−2

=ML

2

T

−2

L

−1

MLT

−2

=MLT

−2

The total distance traveled by an athlete that runs with velocity 11 km/h for 4 minutes, 14 km/h for the next 2 minutes, and 17 km/h for other 5 minutes is 223 m

v = d / t

v = Velocity

d = Distance

t = Time

1 km / h = 1 / 60 km / min

d = v / t

For first 4 minutes,

v = 11 km / h

v = 11 / 60 km / min

v = 0.183 km / min

d = 0.183 / 4

d = 0.046 km

For the next 2 minutes,

v = 14 km / h

v = 14 / 60 km / min

v = 0.23 km / min

d = 0.23 / 2

d = 0.12 km

For the next 5 minutes,

v = 17 km / h

v = 17 / 60 km / min

v = 0.283 km / min

d = 0.283 / 5

d = 0.057 km

Total distance = 0.046 + 0.12 + 0.057

Total distance = 0.223 km

Total distance = 223 m

Therefore, the total distance traveled is 223 m

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Answer:

Solution,

\(p = \frac{w}{t} \\ or \: 30 = \frac{1200}{t} \\ or \: 30 \times t = 1200 \\ or \: t = \frac{1200}{30} \\ t = 40 \: seconds\)

Hope this helps..

Good luck on your assignment.

Answer:

40 seconds

Explanation:

Time (measured in seconds) = Work Done (measured in Joules) / Power (measured in Watts)

Time (s) = 1200/30

Time (s) = 40

It will take 40 seconds for a 30W light bulb to transfer 1200J of energy.

Answer:

The Alkali Metals

sodium is a member of the alkali metal family with potassium (K) and lithium (Li). Sodium's big claim to fame is that it's one of two elements in your table salt. When bonded to chlorine (Cl), the two elements make sodium chloride (NaCl).

Answer:

Explanation:

Sodium is a member of the alkali metal family, along with potassium (K) and lithium (Li). The fact that sodium is one of two elements in table salt is its main claim to fame. When bonded with chlorine (Cl), the two elements combine to form sodium chloride (NaCl).

Solution :

The direction of current is into the page.

The magnetic field \($B_1$\) due to the wire is perpendicular to AP and the magnetic field \($B_2$\) due to the wire is perpendicular to BP. Thus, the net magnetic field at point P is towards the right.

The net magnetic field at point P is

\($B_{net} = B_1 \cos \theta + B_2 \cos \theta$\)

The magnetic field is

\($B_1=B_2=\frac{\mu_0I}{2 \pi L}$\)

The angle θ is

\($\theta = \cos^{-1}\frac{h}{L}$\)

The net magnetic field at point P is

\($B_{net}=\left(\frac{\mu_0I}{2 \pi L}\right)\left(\frac{h}{L}\right)+\left(\frac{\mu_0I}{2 \pi L}\right)\left(\frac{h}{L}\right)$\)

       \($=\frac{\mu_0 Ih}{\pi L^2}$\)

a). The direction of the current for both the wires is from north to south. The net magnetic field is towards the right when we are facing south.

\($B_{net}=\frac{\mu_0 Ih}{\pi L^2}$\)

       \($=\frac{\mu_0I L}{\pi \left(\sqrt{h^2+(d/2)^2\right)^2}}$\)

       \($=\frac{4 \pi \times 10^{-7} \times 100 \times 15}{\pi \left(\sqrt{15^2+(3/2)^2\right)^2}}$\)

       \($=2.64 \times 10^{-6} \ T$\)

The direction is towards the west.

b). Since, both the magnetic field are equal and opposite, so no magnetic field is produced.

Answer:

Time:

t = 12 s

Explanation:

Given:

g = 1.62 m/s

H = 120 m

V₀ =0 m/s

__________

t - ?

From the formula:

H = V₀·t + g·t² / 2

H = g·t² / 2

we find the time:

t = √ (2·H / g)

t = √ (2·120 / 1.62) ≈ 12 c

Answer:

200000 newtons

Explanation:

KE=1/2m*v^2

1/2*1000*20^2

1/2*1000*400

1000*200

200000

An inductor always resists any change in the current through it. The correct statement about inductors is D.


This is due to the property of inductance, which is the ability of an inductor to generate a voltage that opposes any change in the current through it. This is described by Faraday's law of electromagnetic induction. As a result, inductors are commonly used in circuits to smooth out changes in current, and also to filter out high-frequency signals.

Option A is incorrect because inductors store energy in a magnetic field, not by building up charge. Option B is incorrect because an inductor allows current to flow through it, but opposes changes in the current. Option C is incorrect because the current in the circuit will eventually become steady, but not zero. Hence option D is correct.

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All the statements are true regarding a conductor in electrostatic equilibrium.

The correct answer: A, B and C.

In addition to the three statements that are true regarding a conductor in electrostatic equilibrium, there are a few other important facts to consider when dealing with electric fields. In an electrostatic field, the electric field lines are always perpendicular to the surface of the conductor. This means that any unbalanced charge on a conductor's surface must produce an electric field that is also perpendicular to the surface.

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Given:

Thermal energy is denoted by W

Chemical energy is denoted by X

Electrical energy is denoted by Y

Kinetic energy is denoted by Z

To find the order of energy while converting bagasse to electricity.

Explanation:

The bagasse has chemical energy stored in it.

The bagasse is burned, so chemical energy gets converted into thermal energy.

The thermal energy gets converted into kinetic energy.

The kinetic results in the motion of electrons.

Thus, producing electrical energy.

Hence, the conversion order is XWZY

Each magnetic field contains energy, also called magnetic energy. ... Because a magnetic field is generated by electric currents, the magnetic energy is an energy form of moving charge carriers (electrons). To understand where this energy comes from, it's worth taking a look at how a magnetic field works.

Chemical energy, Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic. ... The chemical energy in food is converted by the body into mechanical energy and heat.

Answer:

65 N

Explanation:

Assuming that the ball was at rest hence initial momentum = 0

Final momentum = mv = 1Kg × 13 ms-1 = 13 kgms-1

But

Ft= mv according to Newton's law

F= mv/t

F= 13kgms-1/0.2s

F= 65 N

Answer:

65 N

Explanation:

Given that :

Mass of ball = 1kg

Velocity = 13m/s

Time = 2 seconds

Using the relation :

Force = (mass * change in velocity) / time

The change in momentum of the ball :

Momentum = mass * change in velocity

Velocity change = (13 - 0) ; Given that initial velocity = 0 (at rest)

Momentum = 1kg * 13m/s

Momentum = 13 kgm/s

Therefore, the force, F equals;

F = change in momentum / time

F = 13kgm/s ÷ 0.2 s

Hence, Force, F = 65N

Answer: The wavelength and frequency of light are closely related. The higher the frequency, the shorter the wavelength. Because all light waves move through a vacuum at the same speed, the number of wave crests passing by a given point in one second depends on the wavelength.

Explanation: