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3 years ago

13

In the figures below, there are four copper wires shown. Assuming that all the wires are the same temperature, which has the gre

atest resistance?

1 answer:

hichkok12 [17]3 years ago

8 0

The speed of the ball is how hard you hit it

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Calculate the hang time of a person who moves 3 m horizontally during a 1.25-m high jump. What is the hang time when the person

jekas [21]

The duration of time for which an object stays in air is called the hang time.

For an athlete who moves 3m horizontally during a 1.25m high jump, the hang time will be the sum of the time taken by the athlete to reach the maximum height and the time taken for the athlete to reach the ground from maximum height.

Calculate the time taken t_1 by the athlete to reach the maximum height

$t_1 = \sqrt{\frac{2h}{g}}$

$t_1 = \sqrt{\frac{2(1.25)}{9.8}}$

$t_1 = 0.5s$

The athlete takes same time to reach the ground from the maximum height, so $t_2 = 0.5s$

Calculate the hang time will be

$t =t_1+t_2$

$t = 0.5+0.5$

$t = 1s$

Therefore the hang time of the athlete when he moves a horizontal distance of 3m is 1s.

Similarly, when the athlete runs 6m horizontally, then also there will not be a change in the hang time of the athlete as the hang time is independent of the horizontal distance covered.

4 0

3 years ago

What phenomenon causes the fuzzy image? What kind of lens is used to correct this, and how is it corrected?

Amiraneli [1.4K]

Sample Response: This phenomenon is called chromatic aberration. This happens when light of different wavelengths focuses at different points. A converging lens is used to help light of different wavelengths focuses at a common point.

8 0

3 years ago

Read 2 more answers

A 400 g ball swings in a vertical circle at the end of

solmaris [256]

Answer:

a = 25 m/s2

Explanation:

A = f/m

A = Speed/Acceleration

F =‘Force

M = Mass

3 0

3 years ago

The magnetic flux through a metal ring varies with time t according to ΦB = at3 − bt2, where ΦB is in webers, a = 6.00 Wb s−3, b

pychu [463]

To solve this problem it is necessary to apply the second derivative of the function to find the maximum time reference and thus calculate the maximum voltage.

With the maximum voltage by Ohm's Law it is possible to find the maximum current.

Ohm's law defines that

E = I*R

Where,

I = Current

R= Resistance

On the other hand by faraday studies and the potential can be expressed at the rate of change of the electric flow, that is

$E = \frac{d\phi}{dt}$

Replacing with our values we have that

$E = \frac{d(6t^3-18t^2)}{dt}$

$E = -18t^2 +36t$

The second derivative is

$E' = -36t+36$

When E' = 0 we have a Maximum, then

0 = -36t+36

t = 1

Therefore when the time is 1s E has a Maximum, replacing at the function

$E(t) = -18t^2 +36t$

$E(1) = -18(1)^2 +36(1)$

$E = 18V$

Then the maximum current will be given by

$I = \frac{E}{R}$

$I = \frac{18}{2.8}$

$I = 6.42A$

Therefore the maximum current induced in the ring is 6.42A

6 0

4 years ago

A t-rated switch may be used to (its/a) ______ current capacity when controlling an incandescent lighting load.

jok3333 [9.3K]

<u>Rated </u>

A t-rated switch may be used to (its/a) <u>Rated</u> current capacity current capacity when controlling an incandescent lighting load.

<h3>What is "current rating"?</h3>

The greatest current that a fuse is rated to carry for an infinite duration without significantly degrading the fuse element is known as the current rating.
There is also a large selection of power switching transistors that have voltage ratings well over 1000V and current ratings up to several hundred amps.

<h3>What does the term "rated current" mean?</h3>

When an electrical device receives its rated voltage and outputs its rated power, it flows at its rated current.
So, when a device is designed for a certain amperage, that amperage is referred to as the equipment's rated current.

<h3>What does electrical "rated" mean?</h3>

An electrical appliance's rating reveals the voltage range at which it is intended to operate as well as the current consumption at that range.
These numbers are typically shown on a rating plate that is fastened to the device, such as 230 volts, 3 amps.

To learn more about current capacity visit:

brainly.com/question/27987428

#SPJ4

6 0

2 years ago