At a given moment in time, instantaneous speed can be thought

In electrical work, the symbol W is used to indicate

kirill115 [55]

The question has no answer, sad to say. The symbol W is used as a shortcut of saying "watts" which refers to the unit of power.
The symbol for Voltage = V
The symbol for resistance = R (unit is Ohms)
The symbol of electromagnetic force = N (for Newton)
The symbol or current = I (unit is A for amperes)

5 0

4 years ago

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A large 75-kg lighting fixture can be hung from wires of identical size and shape made of aluminum, brass, or copper. The values

marshall27 [118]

Answer:

C. Copper

Explanation:

F = Force on string

$L_0$ = Intial length of string

A = Area of string

E = Young's modulus of material

Change in length is given by

$\Delta L=\frac{FL_0}{AE}$

It can be seen that the change in length is inversely proportional to the Young's modulus of the material.

Here

$E_a=0.7\times 10^{11}\ Pa$

$E_b=0.91\times 10^{11}\ Pa$

$E_c=1.1\times 10^{11}\ Pa$

$\\\Rightarrow E_c>E_b>E_a$

So, copper will stretch the least.

5 0

4 years ago

Your teacher wants you to perform an experiment that will demonstrate a chemical property. Which experiment should you choose? A

Dovator [93]

A) Measure the pH of different household chemicals

Explanation:

To demonstrate a chemical property using an experiment, measuring the pH of different household chemicals will be the best way. The pH is the degree of hydrogen or hydroxyl ion concentration in a solution.

Chemical properties tell us about what a substance can do.
It shows if a substance will react with other substances or not.
Examples are flammability, rusting of iron, precipitation, decomposition of water by electric current e.t.c.
Measuring the pH is a chemical property determination procedure.
The pH points to the degree of acidity or alkalinity of a solution.

Learn more:

Chemical change brainly.com/question/9388643

#learnwithBrainly

4 0

3 years ago

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A ball is thrown straight up from the ground with speed v0. At the same instant, a second ball is dropped from rest from a heigh

Kazeer [188]

Answer:

a) $t = H/v_0$

b) $H = v_0^2/g$

Explanation:

Let the first ball throw be the point of reference, we can have following the equation of motion:

1st ball: $h_1 = v_0t - gt^2/2$

2nd ball: $h_2 = H - gt^2/2$

a)When the 2 balls collide they are at the same spot at the same time:

$h_1 = h_2$

$v_0t - gt^2/2 = H - gt^2/2$

$v_0t = H$

$t = H/v_0$

b) The first ball is at its highest point when v = 0. That is

$t = v_0/g$

After this time, the 2 balls would have traveled through a distance of

$h_1 = v_0t - gt^2/2 = v_0^2/g - v_0^2/2g$

$h_2 = gt^2/2 = v_0^2/2g$

Since $H = h_1 + h_2$ we can solve for H

$H = v_0^2/g - v_0^2/2g + v_0^2/2g = v_0^2/g$

3 0

3 years ago

1. How long would the car in Sample Problem C take to come to a stop from its initial velocity of 20.0 m/s to the west? How far

Brilliant_brown [7]

The time taken, and the distance travelled by the car before stop, will be 5.3 second and -53.3 m west.

<h3>What is the distance?</h3>

The length of the path traveled by the body is known as the distance covered by the body.

Distance is a 1-dimensional phenomenon. its unit is a meter(m). The distance can be found by the product of velocity and time.

The given data in the problem will be

u is the initial velocity =20m/sec

t is the time =?

d is the distance =?

From the Newtons second law;

$\rm F \triangle t = \triangle P \\\\ \triangle t = \frac{\triangle P }{F} \\\\ \triangle t = \frac{m(v_f-v_i)}{F} \\\\ \ \triangle t = \frac{2240 (0-20))}{8410} \\\\ \triangle t = 5.3 \ sec \\\$

The distance travelled before the car stop is,

$\rm \triangle t = \frac{1}{2} (v_f+v_i)\traingle t \\\\ \traingle x = \frac{1}{2} (-20+0)5.3 \\\\\ \triangle x= -53.3 m \ west$

Hence,the time taken, and the distance travelled by the car before stop, will be 5.3 second and -53.3 m west.

To learn more about the distance, refer to the link;

brainly.com/question/989117

#SPJ1

6 0

2 years ago