PHYSICS HIGH SCHOOL

A wire that is 0.36 meters long moves perpendicularly through a magnetic field at a speed of 0.21 meters/second. The induced emf produced in the wire is 0.45 volts. What is the magnetic field strength?

Answers

Answer 1

Answer:

Answer:

Magnetic field strength, B = 5.95 Tesla

Explanation:

It is given that,

Length of wire, l = 0.36 m

It is moving perpendicularly through a magnetic field at a speed of, v = 0.21 m/s

Induced emf, E = 0.45 volts

The mathematical expression for induced emf is given by :

$E=(d\phi)/(dt)=Blv$

$(d\phi)/(dt)$ is the rate of change of magnetic flux,

B is magnetic field

So, $B=(E)/(lv)$

$B=(0.45)/(0.36* 0.21)$

B = 5.95 Tesla

Hence, this is the required solution.

Answer 2

Answer: 0.034 newtons/amp·meter

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At what speed must a 950-kg subcompact car be moving to have the same kinetic energy as a 3.2×104−kg truck going 20 km/h?

Answers

Answer:

950-kg subcompact car be moving to have the same kinetic energy of truck at 116.08 km/hr

Explanation:

Kinetic energy of body with mass m and moving at velocity v is given by

$KE=(1)/(2) mv^2$

KE of truck $= (1)/(2)*3.2*10^4*20^2$

KE of subcompact car $= (1)/(2)*950*v^2$

Equating

$(1)/(2)*3.2*10^4*20^2= (1)/(2)*950*v^2\n \n v=116.08 km/hr$

So 950-kg subcompact car be moving to have the same kinetic energy of truck at 116.08 km/hr

Final answer:

To have the same amount of kinetic energy as a 3.2x10^4kg truck moving at 20km/h, a 950-kg subcompact car would need to be moving at an approximate speed of 224 m/s.

Explanation:

The problem requires us to calculate the speed that a 950-kg car must achieve to have the same kinetic energy as a 3.2×104-kg truck moving at 20 km/h. The kinetic energy of an object is represented by the equation K = 0.5mv² where m signifies mass and v speed.

The truck's kinetic energy can be calculated using this formula: Ktruck=0.5(3.2×104kg)(20 km/hr * 1000 m/km / 3600 s/hr)² = 1.96 x 107 J.

For the car to have the same kinetic energy, we set up the following equation and solve for v: 1.96 x 107 J = 0.5(950 kg)v², yielded v = 224 m/s.

Thus, the subcompact car needs to move at a speed of 224 m/s to have the identical kinetic energy as the truck moving at 20 km/h.

Learn more about kinetic energy here:

brainly.com/question/26472013

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It takes 56.5 kilojoules of energy to raise the temperature of 150 milliliters of water from 5°C to 95°C. If youuse an electric water heater that is 60% efficient, how many kilojoules of electrical energy will the heater
actually use by the time the water reaches its final temperature?

Answers

You'd get an extra 40/60 of the energy, or 2/3. Multiply 5/3 by the required energy to get the actual consumption.

The expression that relates emf, potential, current, and resistance is Ohm's law.True or
False

Answers

Answer:

This expression is True

Since the Ohm's Law "states that the current )I) through a material between two points is proportional to the voltage across the two points." and i defined by this formula:

$V = IR$

Where V represent the voltage and it's a value related to the emf and the potential

I represent the current

R represent the resistance.

And for this case we have an expression for this case relating the emf , potential, current and resistance

Explanation:

This expression is True

Since the Ohm's Law "states that the current )I) through a material between two points is proportional to the voltage across the two points." and i defined by this formula:

$V = IR$

Where V represent the voltage and it's a value related to the emf and the potential

I represent the current

R represent the resistance.

And for this case we have an expression for this case relating the emf , potential, current and resistance

Ohms law:
V = IR The relationship between electrical resistance, current, and voltage is defined by the mathematical relationship V= IR and is referred to as Ohm's law. In this equation "V" stands for voltage, measured in volts, "I" stands for current, measured in amperes, and "R" stands for resistance, measured in Ohms (Ω ).Common sources of voltage in circuits may be chemical cells (a battery is a combinations of cells) and generators. Sources of electrical resistance in circuits may include resistors, light bulb filaments, wire conductors and other electric devices. When solving Ohm's law problems you are expected to solve for any unknown variable.
Example: Determine the voltage of the circuit shown below in diagram "A".Diagram A In this circuit we are given the current from the ammeter .2A. We also can determine the resistance. Since this is a series circuit the total resistance is the sum of the resistances of L1 and L2, 70Ω . We set the problem up and solve it like this.
V=IR
V=.2A 70Ω
V= 14VThe answer is 14V

How many days will it take for one half of the original amount of a radioactive substance to decay if the half-life is 30 days?a. 3 days
b. 15 days
c. 30 days
d. 60 days

Answers

Answer:

C. 30 years

Explanation:

Half life of a radioactive substance is defined as the time taken by the substance to decay to half of its original value.

The number of days it will take for one half of the original amount of a radioactive substance to decay given the half life of 30 years will be that same 30years according to the half life definition.

According to the formula for half life t1/2 = ln2/¶ where ¶ is the decay constant.

¶ = ln2/t1/2

¶ = ln2/30

¶ = 0.023

Using the radioactivity formula to get the time it will take 1/2 of the original amount to decay, we have;

N/No = e^-¶t where

N/No is the fraction of amount decayed at time t i.e 1/2

Substituting the given values in the equation, we have;

1/2 = e^-0.023t

ln1/2 = lne^-0.023t

ln1/2 = -0.023t

t = ln0.5/-0.023

t = 30years.

C 30 days it answers the question in itself

Choose "extinct" if the species is extinct and "endangered" if the species is endangered. Sixty years ago, as few as 20 whooping cranes were left on earth. Now, thanks to conservation efforts, there are more than 300 whooping cranes in the wild.

A.extinct

B.endangered

Answers

The species is actually endangered and not extinct because there are only 20 species left. Extinct actually means that there would be no species left and so it an incorrect option. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer has helped you.

Answer:

B.endangered

Explanation:

Choose "extinct" if the species is extinct and "endangered" if the species is endangered.

Sixty years ago, as few as 20 whooping cranes were left on earth. Now, thanks to conservation efforts, there are more than 300 whooping cranes in the wild.

A.extinct

B.endangered

if there are 20 whooping cranes sixty years ago, and then we have more than 300 today. then it means that the species are endangered

I will go with B

An extinct species no longer exist because there are no offsprings of the parent specie which can give birth to more subspecies .

species no longer exist anywhere on Earth, and once gone they are gone ... on International Trade In Endangered Species like Wild Fauna and Flora (CITES). .... in 1975; the species now numbers more than 1, 000 animals .... whooping cranes, this approach fails to protect most endangered species

Endangered means that the existence is threatened by some human activities, prevailing conditions in the environment or the host it feeds on to survive no longer exists within it reach, hence its survival is at stake

Waves = 24, Time
6 seconds, Frequency=

Answers

Answer:

4 times/second

Explanation:

24/6 = 4

THE END

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