The words can only be used onece. Use the words to complete the sentences below: Switch, break, on, complete, electricity, bulb, off, battery A circuit which has a _____________________ in it will not allow _____________________ to flow through it. A device called a ______________________ can be used to ______________ a circuit so that other devices can be switched ____________ or ______________________.

Hello!

We can use the following equation for the potential difference between two parallel plates given an electric field and separation distance:
[tex]V = Ed[/tex]

V = Potential Difference (? V)
E = Electric field strength (100.0 N/C)

d = distance between places (0.02 m)

Plug in the values and solve.

[tex]V = (100)(0.02) = \boxed{2 V}[/tex]

Answer:

c

Explanation:

wavelength shorter means energy is higher

the wavelength

radio waves>microwave>infrared rays>gamma rays

Answer:

See below

Explanation:

East components are   10    and    12 cos 30   = 20.392 m/s

North component =  12 sin 30 = 6 m/s

Resultant velocity = sqrt ( 20.392^2 + 6^2) = 21.26 m/s

  direction   arc tan   (6/20.392) = 16.4 degrees N of east

The voltage across the resistor increases because extra electron gained by the LDR when the light is shone on it.

Increase in the voltage can occur due to some of the following reasons.

From Ohm's law voltage is directly proportional to current flowing in a circuit.

V ∝ I

The voltage across the resistor increases because extra electron gained by the LDR when the light is shone on it.

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The actual question should be did the sound waves escape room?

Yes they can escape the room

An object's acceleration if it is moving and comes to a stop in 5 s will be  8 m/s².

Acceleration is defined as the rate change of velocity with time.

acceleration a = (Δv) / (Δt)

An object is moving with initial velocity u = 40 m/s and it comes to stop, then its final velocity  v= 0 m/s.

Time taken for the change in speed t=5s.

The acceleration is given by

a = (40 -0)/ 5

a = 8 m/s²

Thus, the object's acceleration is  8 m/s².

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The magnitude of the angular acceleration of the magnetic disk is determined as 35 rad/s².

The angular acceleration of the disk is determined from the principle of conservation of angular momentum as follows;

τ = Iα

where;

α is angular acceleration

I is moment of inertia of the disk

I = 0.5MR²

I = 0.5 x 0.2 x 2²

I = 0.4 kgm²

τ = Iα

α = τ/I

α = (14)/(0.4)

α = 35 rad/s²

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The magnetic and electrostatic can be either attractive or repulsive. The correct option is C.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects.

Non-contact forces, such as electrostatic forces, pull or push on objects without actually making contact with them.

When certain materials are rubbed together, a phenomenon known as "charge" can be transferred from one surface to another.

One of the four fundamental forces of nature, the electromagnetic force, results in the magnetic force, which is brought about by the motion of charges.

When two charge-containing objects move in the same direction, a magnetic attraction pulls them together.

Thus, the correct option is C.

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The direction of the angular velocity of the minute hand of a wall-clock is perpendicular to the wall and directed inwards.

The passenger slides away from the centre of the curve.

The angle θ which a cyclist should make with the vertical while taking a circular turn of radius r with velocity v given by

tan θ = v^2/rg

Sharper the curve, smaller is the radius and greater is the value of 0.

Problem 2

Answer: Choice D only

Explanation:

Let's go through the list of possible answers

Given that 1 ounce equals 28.35 grams, the value of 14.600 ounces in grams is approximately 413.9g.

Note that:

1 ounce = 28.35 grams

Given that;

Since 1 ounce = 28.35 grams, 14.600 oz will be;

14.600 oz = ( 14.600 × 28.35) grams

14.600 oz = 413.9g

Given that 1 ounce equals 28.35 grams, the value of 14.600 ounces in grams is approximately 413.9g.

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Answer:

55 kg

Explanation:

Formula :

Force = mass × acceleration

=========================================================

Given :

⇒ Force = 220 N

⇒ acceleration = 4 m/s²

===========================================================

Solving :

⇒ 220 N = mass × 4 m/s²

⇒ mass = 220/4

⇒ mass = 55 kg

According to the universal law of gravitation, the force due to gravity is a. inversely proportional to the square of the distance between objects.

Newton's law of universal gravitation states that objects are attracted to each other in the universe with a force directly proportional to the product of their masses and inversely proportional to the square of their distance apart.

The equation that represents this law is;

F = G × M1M2 ÷ r∧2

Where,

F is the gravitational force acting between two objects

M1 and M2 are the masses of the objects

r is the distance between the centers of their masses

G is the gravitational constant.

Thus. according to the universal law of gravitation, the force of gravity is inversely proportional to the square of the distance between objects.

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Answer:

Explanation: RADIUS OF EARTH = 6400X1000m =

ACC DUE GRAVITY ABOVE SURFACE OF EARTH = g' =2.45 m/s^2

ACC DUE GRAVITY ON SURFACE OF EARTH =g= 9.8 m/s^2

A/C TO FORmULA

g'/g=1-2h/Re

g'/g +2h/Re = 1

2h/Re =1- g'/g

2h= (1- g'/g)Re

2h=(1-2.45 /9.8)

6400X1000

2h = (0.75)6400X1000

2h = 4800000

h= 2400000

m

Answer:

E......1,800 meters

Explanation:

distance = speed × time

convert 1 min to seconds because speed is give in meters per seconds so it's which is 60 seconds

Then...60 ×30 = 1,800

From the calculation, Sheila’s velocity immediately after she is thrown from the bike is 5.7 m/s.

Momentum is the product of mass and velocity. We know that the momentum before collision is equal to the momentum after collision.

Hence;

Momentum before collision = 340 kg • m/s.

Momentum after collision = 60v

Thus;

340 kg • m/s = 60v  kg • m/s

v = 340 kg • m/s/60 Kg

v = 5.7 m/s

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The raising of window blinds is changing the amount of work done because work is easier by changing the direction of the force.

Work done refers to the product of component of a force in the direction of distance and the magnitude of this distance.

According to this question, a woman raises window blinds by pulling down on the cord.

The work done on the blind is made easier because load is relieved by changing the direction of the force.

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The  motion of the ball on the frictionless ramp is defined by increasing translational speed with non zero angular speed. The correct option is C.

When a body is moving on a circular track, the speed of the particle is called as the angular speed.

When a ball is rolling without slipping, the motion is both translational and rotational. At point of contact at rest, the velocity is zero. The ball rolls without slipping only if the ball moves with zero speed at point of contact.

On the inclined part, the gravity acts straight downward. Velocity remains constant, ramp pushes back the ball and so the ball pushes ramp. There will be no acceleration and velocity remains constant. The angular speed is directly proportional to the linear velocity.

Thus, the correct option is C.

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Answer:

current

Explanation:

According to ohm’s law, resistance is equal to voltage divided by current.

Answer:

According to ohm’s law, resistance is equal to voltage divided by current.

Explanation:

R = resistance

V = voltage

I = current

R = V/I

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(a) The force required to remove the sheet increases with increase in speed due to change in magnetic flux.

(b) The area in the magnetic field changes as the sheet is being put in between the poles. Thus, a force would be required to put the sheets.

When the sheet is pulled out, from the electromagnet there is change in magnetic flux given as follows;

Ф = BA

where;

emf = dФ/dt

F = qVB

Thus, the force required to remove the sheet increases with increase in speed due to change in magnetic flux.

Also, the area in the magnetic field changes as the sheet is being put in between the poles. Thus, a force would be required to put the sheets.

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Answer:

0.56 Watt

Explanation:

Work done = 8 kJ = 8000J

Time = 4 hours = 4*60*60s = 14400sec

Power = ?

Formula of Power is,

Power = Work done / Time

Power = 8000/14400

Power = 0.56 Watt

Hence, Power of person is 0.56Watt.

In the freezing physical change, when 210.0 g of water a 0 degrees freezes into ice, it gives off 71.0 kJ of heat.

It is a physical change in which liquids give off heat to form solids.

We have 210.0 g of water at 0°C. We can calculate the amount of heat given off when it freezes into ice using the following expression.

Q = ΔH°fus × m

Q = 0.334 kJ/g × 210.0 g = 70.1 kJ

where,

In the freezing physical change, when 210.0 g of water a 0 degrees freezes into ice, it gives off 71.0 kJ of heat.

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Answer:

18 000 m/ s

Explanation:

speed = wavelength * frequency

speed =  1.2  * 15 000 = 18 000 m/s

Answer: C. Be more dense and flow under warm air.

Explanation:

think of a supermarket selling dairy products and when you open the fridge to get the milk, outside the supermarket is hot and inside the fridge is cold ice.

Nuclear fusion and fission involve changes in the nucleus of atom, but nuclear fission is  most  in employed nuclear power plants around the world whereas fusion occurs on the sun.

Nuclear fission is a reaction in which the nucleus of large atoms are split into nuclei of two or more smaller atoms.

Nuclear fusion is a reaction in which nuclei of two or more smaller atoms are combined to give an atom of larger nucleus.

Large amounts of energy are involved in both reactions.

The Sun produces energy by nuclear fusion.

However, the most commonly employed method in nuclear power plants is nuclear fission because the necessary conditions required for nuclear fusion have not being developed currently.

Therefore, nuclear fusion and fission involve changes in the nucleus of atom, but nuclear fission is  most  in employed nuclear power plants around the world whereas fusion occurs on the sun.

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Answer:

f = 1.18 x 10¹¹ Hz

Explanation:

The equation used to find frequency is:

f = c / w

In this form, "f" represents the frequency (Hz), "c" represents the speed of light (3.0 x 10⁸ m/s), and "w" represents the wavelength (m).

Since you have been given the value of the constant (c) and wavelength, you can substitute these values into the equation to find frequency.

f = c / w                                                      <---- Formula

f = (3.0 x 10⁸ m/s) / w                                 <---- Plug 3.0 x 10⁸ in "c"

f = (3.0 x 10⁸ m/s) / (2.55 x 10⁻³ m)            <---- Plug 2.55 x 10⁻³ in "w"

f = 1.18 x 10¹¹ Hz                                         <---- Divide

The spectral type is B, the temperature is 18,000, the absolute magnitude is 0 and the luminosity is 100.

The value of luminosity is independent of an observer's distance from an object since it is an absolute measure of radiant power.

Astronomers commonly express an object's brightness in terms of solar luminosities, with one solar luminosity equaling the luminosity of the Sun.

Hence, the spectral type is B, the temperature is 18,000, the absolute magnitude is 0, and the luminosity is 100.

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The circuit change when a wire is added is, an open circuit occurs and makes all bulbs turn off.

A closed circuit is a type of circuit connection in which the wire connection is complete and current flow occurs, turning the light bulbs on in the process.

An open circuit is a type of circuit connection in which the wire connection is incomplete and current cannot flow, turning off the light bulbs.

Thus, the circuit change when the wire is added is, an open circuit occurs and makes all bulbs turn off.

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The time delay between the arrival of the two pulses at the ceiling is 2.33 ms.

Any object of mass is attracted towards another by point where whole mass is supposed to be concentrated is called center of gravity.

A 1750 N irregular beam is hanging horizontally by its ends from the ceiling by two vertical wires (A and B), each 1.25 m long and weighing 0.290 N.

The center of gravity of this beam is one-third of the way along the beam from the end where wire A is attached.

Taking moments about one end, to find the tension at other end.

Tb X L = WxL/3

here, W is the weight, L is the length of wire and Tb is the tension at point B.

So, Tb = W/3

and
Tb - Ta = W

here, Ta is the tension in end A.

Substitute the values, we get

Tb = 583.33N and Ta = 1166.66N

Velocity of end A, Va = (1166.66 x1.25 x 9.81/0.290 )^(1/2)

Va = 222 m/s

Velocity of end B, Vb = (583.33 x1.25 x 9.81/0.290 )^(1/2)

Va = 157 m/s

Time delay t is related with the velocities as

t = L/Vb - L/Va

Substitute the values, we get

t= 0.00233 s

t = 2.33 ms

Thus, time delay between the arrival of the two pulses at the ceiling is 2.33 ms.

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Answer:

Supplementary units are the dimensionless units that are used along with the base units to form derived units in the International system.

Explanation:

Since they have no units under SI system, they can be considered dimensionless.

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