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3 years ago

If a point has 40 J of energy and the electric potential is 8 V, what must be the charge?

Physics

2 answers:

Alekssandra [29.7K]3 years ago

8 0

If a point has 40 J of energy and the electric potential is 8 V, the charge must be: A. 5 C

Given the following the details;

Energy = 40 Joules

Electric potential = 8 Volts

To find the quantity of charge;

Mathematically, the quantity of charge with respect to electric potential is given by the formula;

$Quantity \; of \; charge = \frac{Energy}{Electric \; potential}$

Substituting the values into the formula, we have;

$Quantity \; of \; charge = \frac{40}{8}$

Quantity of charge = 5 Coulombs

Therefore, the quantity of charge must be 5 Coulombs.

Find more information: brainly.com/question/21808222

s344n2d4d5 [400]3 years ago

8 0

Energy=E=40J
Potential difference=V=8V
Charge=Q

$\boxed{\sf E=QV}$

$\\ \rm\longmapsto Q=\dfrac{E}{V}$

$\\ \rm\longmapsto Q=\dfrac{40}{8}$

$\\ \rm\longmapsto Q=5C$

Hence total charge must be 5C.

Note:-

SI unit of charge is Coulomb (C)

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Answer:

The tangential acceleration of the pedal is 0.0301 m/s².

Explanation:

Given that,

Length = 19 cm

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Time = 10 sec

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Using formula of tangential acceleration

$a_{t}=r\alpha$

$a_{t}=\dfrac{23\times10^{-2}}{2}\times\dfrac{\omega_{2}-\omega_{1}}{t}$

$a_{t}=\dfrac{23\times10^{-2}}{2}\times\dfrac{90\times\dfrac{2]pi}{60}-65\times\dfrac{2\pi}{60}}{10}$

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3 years ago

8. If you ran up stairs that were 6 m high in 6.5 seconds and you weigh 600N how much power

jekas [21]

Answer:

553.8 Watts

0.74 Hp

Explanation:

Power is work done per unit time, expressed as

P=W/t

Where P is power, t is time taken and W is work done.

Work is the product of force and perpendicular distance moved hence W=Fd where F is force and d is perpendicular distance.

Substituting W with Fd into the first formula then power is expressed as

P=Fd/t

Substituting F with 600 N, d with 6 m and t with 6.5 seconds then

P=600*6/6.5=553.84615384615 Watts

Rounded off as 553.8W

1 W=0.00134 british horsepower

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Alternatively, we divide the watts by 746 hence 553.8/746=0.7424211177562

Rounding off, power is equal to 0.74 Hp

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3 years ago

A motorcycle is traveling up one side of a hill and down the other side. The crest of the hill is a circular arc with a radius o

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Answer:

21.8 m/s

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At the top of the hill (crest), there are two forces acting on the motorcycle:

- The reaction force of the road, N (upward)

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Since the motorcycle is moving by circular motion, the resultant of these forces will give the centripetal force, so:

$mg-N = m\frac{v^2}{r}$

where the direction of the weight (mg) is equal to that of the centripetal force, and where

m is the mass of the cycle

g = 9.8 m/s^2 is the acceleration of gravity

v is the speed

r = 48.6 is the radius of the hill

The cycle loses contact with the road when the reaction force becomes zero:

N = 0

Substituting into the equation, we therefore find the maximum speed that is allowed for the cycle before losing constact:

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6 0

2 years ago

A block of gelatin is 120mm by 120mm by 40mm whrn unstressed. A force of 49N is applied tangentially to the upper surface causin

Inessa05 [86]

Answer:

The shearing stress is 10208.3333 Pa

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Explanation:

Given:

Block of gelatin of 120 mm x 120 mm by 40 mm

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Questions: Find the shear modulus, Sm = ?, shearing stress, Ss = ?, shearing strain, SS = ?

The shearing stress is defined as the force applied to the block over the projected area, first, it is necessary to calculate the area:

A = 40*120 = 4800 mm² = 0.0048 m²

The shearing stress:

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The shearing strain is defined as the tangent of the displacement that the block over its length:

$SS=tan\theta =\frac{Displacement}{L} =\frac{10}{40} =0.25$

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3 years ago

A pendulum has 294 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom o

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Newton's law of conservation states that energy of an isolated system remains a constant. It can neither be created nor destroyed but can be transformed from one form to the other.

Implying the above law of conservation of energy in the case of pendulum we can conclude that at the bottom of the swing the entire potential energy gets converted to kinetic energy. Also the potential energy is zero at this point.

Mathematically also potential energy is represented as

Potential energy= mgh

Where m is the mass of the pendulum.

g is the acceleration due to gravity

h is the height from the bottom z the ground.

At the bottom of the swing,the height is zero, hence the potential energy is also zero.

The kinetic energy is represented mathematically as

Kinetic energy= 1/2 mv^2

Where m is the mass of the pendulum

v is the velocity of the pendulum

At the bottom the pendulum has the maximum velocity. Hence the kinetic energy is maximum at the bottom.

Energy can neither be created e destroyed. It can only be transferred from one form to another. Implying this law and the above explainations we conclude that at the bottom of the pendulum,the potential energy=0 and the kinetic energy=294J as the entire potential energy is converted to kinetic energy at the bottom.

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3 years ago