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3 years ago

Which statement describes a resistor in a circuit?

Physics

2 answers:

Usimov [2.4K]3 years ago

5 0

Answer: B. It heats up by opposing the flow of charge through the circuit.

Explanation: A P E X

kozerog [31]3 years ago

4 0

A resistor in a circuit acts as a switch to control the flow of charge in a circuit.

Explanation:

An electrical components that plays a role of limiting or regulating the electrical current flow is termed as Resistor. It can be helpful for the purpose of giving certain voltage to a device like a transistor. The current that is passing through a resistor has a inverse proportionality with its resistance and direct proportionality to the voltage that is passing across it., provided another factors remaining unchanged. This can be explained by Ohm's Law.

The electric current that is passing through an electrical circuit will always be dependent on the the voltage and the resistance. When the current flowing throgh a circuit is larger then it can result in heating that damages and burn he resistors or the objects that is present around the circuit.

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A 200-mm lever and a 240-mm-diameter pulley are welded to the axle BE that is supported by bearings at C and D. A 860-N vertical

Pachacha [2.7K]

Answer:

A 200mm lever and a 240 mm diameter pulley are welded to the axle BE that is supported by bearings at C and D. If a 860N vertical load is applied at A when the lever is horizontal, determine (a)the tension in the cord, (b)the reactions at C and D. assume that the bearing at D does not exert axial thrust.

see explanation

Explanation:

Part a

The tension in the cord

$\sum M = 0$

860(200) - T(120) = 0

T(120) = 172000

T =1433.33N

The tension in the cord (T) = 1433.33N

Part b

Apply the moment law of equilibrium at point D about y-axis.

$\sum M_D_y = 0$

$C_x = (120)-T(40)= 0$

sustitute 1433.33N for T

$C_x (120)-(1433.33)(40)\\\\C_x (120)=57333.2\\\\C_x=477.78N$

The reaction at C along x-axis 477.78N

Apply the moment law of equilibrium at point D about x-axis

$\sum M_D_z = 0$

$-C_y (120)+860(80+120)=0\\\\-C_y(120)=-17200\\\\y=1433.33N$

The reaction at C along y-axis is 143.33N

Apply the force law of equilibrium along z direction.

$\sum F_z=0$

$C_z=0$

The reaction at C along z-axis is 0N

Apply the force law of equilibrium along x direction.

$\sum F_x=0$

$C_x+D_x+T=0$

substitute 477.78N for $C_x$ and 143.33N for $D_x$

$477.78N+D_x+1433.33N=0\\\\D_x=-1911.11N$

The reaction at D along x-axis is -1911.11 N

Apply the force law of equilibrium along y direction.

$\sum F_y=0$

$C_y+D_y-860=0$

substitute 1433.33 for $C_y$

$1433.33+D_y-860=0\\\\D_y=573.33$

3 0

2 years ago

8. A car travels from Town A to Town B on one road at different speeds and stops at red lights. If you know the distance between

ryzh [129]

Answer:

The velocity

Explanation:

The difference between speed and velocity is the following:

- Speed is defined as the ratio between the total distance covered by an object and the time taken:

$speed = \frac{distance}{time}$

and it is a scalar.

In this problem, we cannot calculate the speed of the car, because we don't know exactly what is the distance covered by the car (we only know the distance between town A and town B, but we don't know if the car has travelled on a straight path or not, so we don't know the distance it has covered)

- Velocity is defined as the ratio between the displacement and the time taken:

$velocity=\frac{displacement}{time}$

(note that velocity is a vector)

Displacement is the shortest distance (straight line) between the final and the initial point of the motion: in this case, it corresponds to the distance between town A and town B, which we know. Since we also know the time of the trip, this means that we can calculate the velocity of the car.

4 0

3 years ago

What is the formula of Kinetic Energy

Andre45 [30]

K.E = ½ mv²

Explanation:

The formula of Kinetic Energy

K.E = ½ mv²

Where,

m = mass of object

v = velocity of object

The Standard Unit of kinetic energy is Joule, while the Imperial Unit of kinetic energy is foot-pound

-TheUnknownScientist

8 0

2 years ago

Read 2 more answers

9. A sailor pulls a boat along a dock using a rope at an angle of 60.0° with the

aleksklad [387]

Answer: (1) 3.83x10^3 J

Explanation:

(1) Fx=(255N)cos60°

dx=30.0m

w=Fx dx =(255)(cos60°)(30.0m)

6 0

3 years ago

To move a heavy couch across a carpeted floor what could be used to decrease the frictional force

vitfil [10]

Use a piece of cardboard

7 0

3 years ago

Read 2 more answers