What is the current produced by a potential difference of 200V through a resistance of .2 ohms?

An object travels with a constant speed in a circular path. The net force on the object is

Pepsi [2]

Answer:

toward the center

Explanation:

Before answering, let's remind the first two Newton Laws:

1) An object at rest tends to stay at rest and an object moving at constant velocity tends to continue its motion at constant velocity, unless acted upon a net force

2) An object acted upon a net force F experiences an acceleration a according to the equation

$F=ma$

where m is the mass of the object.

In this problem, we have an object travelling at constant speed in a circular path. The fact that the trajectory of the object is circular means that the direction of motion of the object is constantly changing: this means that its velocity is changing, so it has an acceleration. And therefore, a net force is acting on it. The force that keeps the object travelling in the circular path is called centripetal force, and it is directed towards the center of the circle (because it prevents the object from continuing its motion straight away).

So, the correct answer is

toward the center

8 0

3 years ago

18. How does magnetic force affect the energy in a system of magnets when the magnets are released and begin to move? a The magn

astra-53 [7]

When the magnets are released and begin to move, the magnetic force changes potential energy into kinetic energy;<u> option D</u>

<h3>What is magnetic force?</h3>

Magnetic force can be defined as the force of attraction or repulsion that is felt or produced between the magnetic poles and electrically charged moving particles.

Magnetic force is the force that exists due to the attractio or repulsion of objects place around the region of space where a maget exerts its force.

When a magnet is released ai a system of magnets and allowed to move it increases the kinetic eergy of the system by converting potential energy to kinetic energy.

Learn more about magnetic force at: brainly.com/question/28989998

#SPJ1

5 0

1 year ago

Lightning flashes and you hear a thunder clap for seconds later. the velocity of sound is 340 m/s. how far away did lightning st

kondaur [170]

Answer:

For metric-system conversions, follow this method: Sound travels at about 340 m/s, so multiply the number of seconds you counted by 340, and you'll know how many meters away lightning struck. A three-second count, then, would place the lightning strike about 1,020 m away, or roughly 1 km.

Explanation:

hope it hep and if it doesnt sorry

3 0

3 years ago

A tank of gasoline (n = 1.40) is open to the air (n = 1.00). A thin film of liquid floats on the gasoline and has a refractive i

mrs_skeptik [129]

Answer:

Refractive index of film = 1.27

Explanation:

for the constructive interference of reflected light we know that the condition is given as

$2\mu t = N\lambda$

here we know

$\mu$ = refractive index of the liquid film

t = thickness of layer

t = 246 nm

$\lambda = 626 nm$

now from the above condition of maximum interference

$2(\mu)(246 nm) = 626 nm$

$\mu = 1.27$

6 0

4 years ago

A Carnot engine whose high-temperature reservoir is at 620 K takes in 550 J of heat at this temperature in each cycle and gives

Novosadov [1.4K]

(a) W=217 J is the amount of mechanical work done by engine during each cycle.

(b) temperature of the low-pressure reservoir Tc=378K

(c) thermal efficiency of the cycle (e)=0.39=39%

Calculation:

For part (a)

We need to calculate the mechanical work W the engine does.

W = IQHI — IQcl .....................eq(1)

Putting the given values of QH and QC into eq(1) we get

the mechanical work of the engine W

W = 550 - 335

W=217 J

For part (b)

We need to determine the temperature of low temperature reservoir Tc

IQc|/|Qh| =TC/TH

for Tc

Tc=(IQc|/|Qh|)*TH

Now putting the values, we get

Tc= 620K (335/ 550.1)

Tc=378K

For part (c)

We need to find the thermal efficiency (e) of the cycle

e=1-TC/TH

e=1-(378/620)

e=0.39=39%

<h3>What is mechanical energy?</h3>

The energy that an object possesses as a result of its motion or position is known as mechanical energy. Kinetic energy, or the energy of motion, and potential energy are two types of mechanical energy (stored energy of position).

To learn more about mechanical work visit:

brainly.com/question/17190305

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Correct question:

A Carnot engine whose high-temperature reservoir is at 620 k takes in 550 J of heat at this temperature in each cycle and gives up 335 J to the low temperature reservoir.

(a) How much mechanical work does the engine perform during each cycle?

(b) What is the temperature of the low-pressure reservoir?

(c)What is the thermal efficiency of the cycle?

3 0

1 year ago