PHYSICS HIGH SCHOOL

As more lamps are put into a series circuit, the overall current in the circuit a. Increasesb. Decreasesc. Remains the same

Answers

Answer 1

Answer:

Answer:

b. Decreases

Explanation:

The total resistance of a series circuit is equal to the sum of the individual resistances:

$R_T=R_1+R_2+...+R_n$ (1)

Therefore, as we add more lamps, the total resistance increases (because we add more positive tems in the sum in eq.(1).

The current in a circuit is given by Ohm's law:

$I=(V)/(R_T)$

where V is the voltage provided by the power source and $R_T$ is the total resistance. We notice that the current, I, is inversely proportional to the total resistance: therefore, when more lamps are added to the series circuit, the total resistance increases, and therefore the current in the circuit decreases.

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Use your understanding of d-t graphs to describe what is happening in the graph.
While sitting in your car by the side of a country road, you see your friend, who happens to have an identical car with an identical horn, approaching you. You blow your horn, which has a frequency of 260 Hz; your friend begins to blow his horn as well, and you hear a beat frequency of 6.0Hz .How fast is your friend approaching you?Express your answer to two significant figures and include the appropriate units.
Simon draws a diagram to illustrate the law of reflection.Which best explains how Simon can correct the error in his diagram?Draw the incident ray so it is longer than the reflected ray. Make the angle of reflection and the angle of incidence equal.Switch the labels for incident ray and reflected ray. Make the angle of incidence larger than the angle of reflection.

Milwaukee is 121 mi (air miles) due west of Grand Rapids. Maria drives 255 mi in 4.75 h from Grand Rapids to Milwaukee around Lake Michigan. Find: a. Her average driving speed
b. Her average travel velocity

Answers

a).
Average speed = (distance driven) / (time to drive the distance)

   = (255 miles) / (4.75 hours)

   = (255/4.75) (mile/hour) = 53.7 miles per hour .

b).
Average velocity =

   (displacement) / (time for the trip)

   = (distance and direction from
       start-point to end-point,
   regardless of the route)    /    (time for the trip)

   = (121 miles west) / (4.75 hours)

   = (121 / 4.75) (miles per hour west)

   = 25.5 miles per hour west .

Kinetic energy varies jointly as the mass and the square of the velocity. A mass of 15 grams and velocity of 3 centimeters per second has a kinetic energy of 27 ergs. Find the kinetic energy for a mass of 5 grams and velocity of 9 centimeters per second.

Answers

Answer:

Explanation:

Given

Kinetic energy varies jointly as mass and square of velocity

$K.E.\propto m$

$K.E.\propto v^2$

$K.E.=kmv^2$

for $m=15 gm\ and\ v=3 cm/s$

$K.E.=27 ergs$

$27=k(15)(3)^2 -----1$

for $m=5 gm, v=9 cm/s$

$K.E.=k(5)(9)^2----2$

Divide 1 & 2 we get

$(27)/(K.E.)=(15* 3^2)/(5* 9^2)$

$K.E.=81 ergs$

Final answer:

Kinetic energy is proportional to mass and the square of velocity. It can be calculated for different masses and velocities using a constant derived from specific known values.

Explanation:

The principle of kinetic energy states that kinetic energy is directly proportional to mass and the square of velocity. Therefore, we can use the equation Kinetic Energy = 0.5 * Mass * Velocity^2 to calculate kinetic energy.

In this example, a mass of 15 grams and a velocity of 3 cm/s generates a kinetic energy of 27 ergs. By this equation, we derive a constant K. For a mass of 5 grams and a velocity of 9 cm/s, we can easily find the kinetic energy using this K value and multiplying it with the given mass and the square of the velocity.

Learn more about Kinetic Energy here:

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What does Dependent viable meaning in science

Answers

Its the variable which you measure in an experiment. For example, you're conducting an experiment in order to find out how proportions of water affect plant growth, then, your dependent variable should be the height of the plants in the experiment.

A sound wave travels at 330 m/sec and has a wavelength of 2 meters. Calculate its frequency and period.

Answers

The frequency of the wave with a speed of 330 m/s and 2 meter wavelength is 165 Hz. The time period of the wave is then, 0.006 seconds.

What is frequency ?

Frequency of a wave is the number of wave cycles per second. Frequency of a wave is the inverse of its time period. It is inversely proportional to the wavelength and directly proportional to the speed.

Hence, ν = c/λ, where c is the speed.

The frequency of a sound wave is called its pitch.

Given that, c = 330 m/s

wavelength λ = 2 meters.

frequency = 330/2 = 165 s⁻¹ or 165 Hz.

The time period of a wave = 1/ frequency.

T = 1/165 = 0.006 s or 6 milliseconds.

Therefore, the frequency of the wave is 165 Hz and time period is 0.006 seconds.

Find more on sound waves:

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frequency=velocity/wavelength 330/2=165 hertz period=1/frequency=1/165 second

Juanita, en medio de la cuarentena tuvo que salir de su casa por algunos artículos que necesitaba; utilizó su tapabocas y guantes, salió corriendo con velocidad de 3m/s a comprar, 3 kilogramos de arroz, dos litros de leche y 5 tapabocas. Para completar el total de las cosas, primero debe ir al supermercado que esta ubicado a 50 metros, en dirección 30 grados con respecto a la horizontal partiendo desde su casa, y de allí, salir para la droguería que se encuentra ubicada a 70 metros, dirección 150 grados desde el supermercado geográficamente con respecto a la horizontal. 1. Clasifique las cantidades escalares y las cantidades vectoriales del problema

Answers

Answer:

the scalar quantities in this exercise are: 3 kg rice, 2 liters of milk and 5 face masks, the rapides 3 m / s

the vector quantities are: the displacement to the supermarket and the drugstore

Explanation:

For this problem we are asked to find scalar quantities and vector quantities.

A scalar quantity is one that is described by a number with its units

A vector quantity is that described by a number (module), a direction and a sense, that is, they must be represented by a vector

the scalar quantities in this exercise are: 3 kg rice, 2 liters of milk and 5 face masks, the rapides 3 m / s

the vector quantities are: the displacement to the supermarket module 50 m directional 30º sense with respect to the horizontal.

The displacement to the drugstore modulo 70 m direction 150º with respect to the supermarket

How would you change the distance between two positively charged particles if the distance is increased by a factor of 2?a. it is decreased by a factor of 2
b. it is increased by a factor of 2
c. it is increased by a factor of 4
d. it is decreased by a factor of 4

Answers

Answer:

D, it would decrease by a factor of 4

Explanation:

We know the force between two charged particles, also known as Coulombs law.

$F = (kq_(1)q_(2))/(r^2)$

We are only changing the distance, not the charges, so we can ignore both q and look at r, which is the distance between the two positively charged particles.

So let F be our initial condition:

$F \alpha (1)/(r^2) \nF' \alpha (1)/((2*r)^2) = (1)/(4*r^2)\nF' = (1)/(4) *F$

So the answer is D, it decreases by a factor of 4.

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