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3 years ago

Which law is used to find the magnitude of a magnetic force?

Physics

1 answer:

Talja [164]3 years ago

3 0

Answer:

The Flemings left hand rule is used to find the magnitude of a magnetic force

Explanation:

Fleming's left hand rule states that if the first three fingers are held mutually at right angles to one another, then the fore finger points into the direction of magnetic field the middle finger in the direction of current while the thumb points in the direction of force.

Mathematically

Magnetic Force F= BILsinθ

Where

B= magnetic field density Tesla

I= current

L= length of conductor

θ= angle of conductor with field

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what is the geocentric model of stars and planets? a.) the belief that stars and planets revolve around the earth b.) the belief

amid [387]

a.) the belief that stars and planets revolve around the earth

Explanation:

The geocentric model of stars and planets is the belief that stars and planets revolves around the earth.

The model places the earth at the center of the system.

Geo - earth ; centric - center
This was the original school of thought about the way the earth relates to other bodies in the universe.
This model was replaced by the heliocentric universe in which stars are at the center and the planets revolves round them.
The idea was put forward by Nicola Copernicus

learn more:

Energy of the sun brainly.com/question/1140127

#learnwithBrainly

7 0

3 years ago

What is the energy required to change 600g of liquid into steam if the specific heat latent is 4000 J/kg

Rzqust [24]

Answer:

2400 J

Explanation:

Latent heat: This is also called hidden heat, it is the heat that is not detectable by the thermometer.

From the question,

Q = cm.................. Equation 1

Where Q = Energy, c = specific latent heat of the liquid, m = mass of the liquid.

Given: c = 4000 J/kg, m = 600 g =( 600/1000) kg = 0.6 kg

Substitute these values into equation 1

Q = 4000×0.6

Q = 2400 J

Hence the energy required is 2400 J

6 0

3 years ago

A 36-g ball at the end of a string is swung in a vertical circle with a radius of 19 cm. The tangential velocity is 200.0 cm/s.

STALIN [3.7K]

Answer:

0.758 N

Explanation:

mass of ball, = 36 g = 0.036 kg

radius, r = 19 cm = 0.19 m

tangential velocity, v = 200 cm / s = 2 m /s

The tension is the string is equal to the centripetal force acting on the ball.

The centripetal force acting on the ball is given by

$T=\frac{mv^{2}}{r}$

$T=\frac{0.036 \times 2 \times 2}{0.19}$

T = 0.758 N

Thus, the tension in the string is given by 0.758 N.

7 0

3 years ago

I need help on this question!!

mr_godi [17]

Answer:

$\boxed {\boxed {\sf 6000 \ Joules}}$

Explanation:

Work is the product of force and distance.

$W=F*d$

The force is 500 Newtons and the couch is raised 12 meters above the ground.

Substitute these values into the formula.

$W=500 \ N * 12 \ m$

Multiply.

$W=6000 \ N*m$

1 Newton meter is equal to 1 Joule.
So, our answer of 6000 N*m equals 6000 J

$W= 6000 \ J$

The work done to move a 500 Newton couch 12 meters is 6000 Joules. Therefore, choice D is correct.

3 0

3 years ago

Read 2 more answers

Sam, whose mass is 72 kg , takes off across level snow on his jet-powered skis. The skis have a thrust of 190 N and a coefficien

Westkost [7]

Answer:

181.11 m

Explanation:

Net Force is the sum of all the resultant force of all the forces acting on a body. The net force experienced by the jet is the difference of the Applied force and frictional force and this is represented in equation 1;

$F_{net} = F_{applied} - F_{friction} \\$ ............................1

but $F_{friction}$ = μmg .......................................2

Where μ is the coefficient of friction = 0.1

m is the mass of the body = 72 kg

g is the acceleration due to gravity 9.81 m/ $s^{2}$

Substituting into equation 2 we have;

$F_{friction}$ = 0.1 x 72 x 9.81

$F_{friction}$ = 70.63 N

Now we substitute our answer in equation 1;

$F_{net} = 190 N - 70.63 N \\$

$F_{net}$ = 119.37 N

We have to calculate the net acceleration in order to get our velocity .

$F_{net}$ = m $a_{net}$

$a_{net}$ = $\frac{F_{net}}{m}$

$a_{net}$ = $\frac{119.37 N}{72 kg }$

$a_{net}$ = 1.66 $m/s^{2}$

Speed can be express as;

v = u + at ...................3

where u is the initial velocity, which is 0 in this case.

a is the net acceleration = 1.66 $m/s^{2}$

t is the time which is 9 s

substituting the values in equation 3 we have

v = 1.66 $m/s^{2}$ x 9 s

v = 14.94 m/s

Calculating for Sam's distance for the first 9 seconds, using the equation of motion we have;

$S_{1} = ut +\frac{1}{2}at^{2}$

the jet was initially at rest so initial velocity is 0 and $a_{net}$ = 1.66 $m/s^{2}$

$S_{1} = \frac{1}{2} *1.66 m/s^{2} *9^{2}$

$S_{1}$ = 67.23 m

Also we have to calculate Sam's distance after nine seconds using equations of motion express below;

$v^{2} -u^{2} = 2as$

making S the subject formula we have;

$S_{2} =\frac{v^{2}-u^{2} }{2a}$ ....................................4

v is the maximum velocity after the fuel finished and its 14.94 m/s and a is the acceleration along the horizontal plane which put into consideration the coefficient of friction. a = μg = 0.1*9.8 m/ $s^{2}$ = 0.98 m/ $s^{2}$

We substitute our values into equation 4 to get our remaining distance;

$S_{2} = \frac{(14.94 m/s)^{2} }{2(0.98 m/s^{2} )}$

$S_{2}$ = 113.88 m

Therefore the total distance S = $S_{1}$ + $S_{2}$

S = 67.23 m + 113.88 m

The total distance covered by Sam is 181.11 m

8 0

3 years ago

Read 2 more answers