the resistance of a wire of length 80cm and of uniform area of cross-section 0.025cmsq., is found to be 1.50 ohm. Calculate specific resistance of wire in SI units, Help please

Answers

Answer 1

Answer: $Specific\ resistance\ =resistivity\n From\ formula\ on \ resistance:\ R= (pL)/(A)\ p-resistivity,\ L-length,\n A-area\ of\ cross\ section\n p= (R*A)/(L)= (1,5Ohm*0,025*10^(-4)m^2 )/(80* 10^(-2)m )=0,0003515625 Ohm*m$

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What is the average speed of a car that traveled 300.0 miles in 5.5 hours?

Answers

The average speed of will be "0.41 m/s".

Speed and Distance:

According to the question,

Distance = 300.0 miles

Time = 5.5 hours

We know,

$300.0$ miles = $482803$ meters

Now,

By converting 5.5 hours into seconds, we get

= $5.5* (60)/(1)* (3600)/(1)$

= $1,188,000$

hence,

The speed will be:

= $(482803)/(1188000)$

= $0.406$ or, $0.41 \ m/s$

Thus the above answer is right.

Find out more information about speed here:

brainly.com/question/4931057

Answer:

54.54 miles per hour

Explanation:

You do 300 divided by 5.50 to get 54.545454 but you can estimate it to be about 54.54 miles per hour.

So, top average speed of car was 54.54 mph.

How much kinetic energy does a 7.2-kg dog need to make a vertical jump of 1.2 m? the acceleration due to gravity is 9.8m / s^2

Answers

$E_k=mgh\n\nm=7.2\ kg\n\ng=9.8\ m/s^2\n\nh=1.2\ m\n\nE_k=7.2\cdot9.8\cdot1.2=84.672\ \left[(kgm^2)/(s^2)\right]=84.672\ [J]$

Assuming that no energy is wasted,
Use the equation Gpe=mgh
Mass*gravity*height
1.2*7.2*9.8=
84.672
(The answer might be wrong I did it in my head)

A dart is thrown horizontally with an initial speed of 19 m/s toward point P, the bull's-eye on a dart board. It hits at point Q on the rim, vertically below P, 0.19 s later. (a) What is the distance PQ

Answers

Answer:

Explanation:

The dart will go forward horizontally with velocity of 19 m/s. It will also fall downwards with initial velocity of zero and gravitational acceleration of 9.8 m/s².

Distance PQ covered by the dart can be calculated using the following formula.

s = ut + 1/2 at²

u is initial velocity , a is acceleration and t is time.

Putting the values

s = 0 + 1/2 x 9.8 x .19²

= .1769 m

= 17.69 cm.

The sound wave produced can best be described as a ?

Answers

the sound wave produced can be described As a longitudinal wave of constant frequency

Longitudinal waves are waves in which the displacement of the medium is in the same direction as or the opposite direction to , the direction of travel of the wave. In a constant frequency, our brain will acknowledge this wave as 'sound'

A current of 4A flows in a wire of resistance 60 ohm. calculate electrical energy consumed in 2 min.

Answers

Power dissipated = energy/second= (current)² x (resistance)

Power dissipated = energy / second = (4)² x (60) = 960 joules per second= 960 watts

Energy = (power) x (time) = (960 watts) x (2 minutes) x (60 sec/minute)

= 115,200 joules

Which one of the following types of electromagnetic radiation causes certain substances to fluoresce? A. Ultraviolet rays
B. Infrared waves
C. X rays
D. Cosmic rays

Answers

It is Ultra-Violet rays

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