Endothermic reactions give off heat as they proceed. <br> a. True<br> b. False

A straight, nonconducting plastic wire 8.00 cm long carries a charge density of 100 nC/m distributed uniformly along its length.

Sphinxa [80]

Answer:

(A) 16641 N/C (B) 72000 N/C

Explanation:

We have given the length of the wire = 8 cm =0.08 m

Charge density = 100 nC/m

So charge = 100 ×0.08 = 8 nC $=8\times 10^{-9}C$

(A) Electric field E that produce 6 cm directly above its midpoint will be

$E=\frac{KQ}{X\sqrt{X^2+a^2}}=\frac{9\times 10^9\times 8\times 10^{-9}}{0.06\sqrt{0.06^2+(\frac{0.08}{2})^2}}=16641N/C$

Here X is the distance where we have to find the electric field

(B) Now electric field due to flat ring will be

$E=\frac{KQX}{(X^2+a^2)^\frac{3}{2}}$

Here X is the distance where we have to find the electric field

So $E=\frac{9\times 10^9\times 8\times 10^{-9}}{(0.06^2+0.08^2)^\frac{3}{2}}=72000N/C$

7 0

4 years ago

Sam runs 9 kilometers in 2.5 hours. what is his speed?

svp [43]

Considering the definition of speed, the speed of Sam is 3.6 $\frac{km}{h}$ .

<h3>Definition of speed</h3>

Speed is a quantity that expresses the relationship between the space traveled by an object. That is, the speed is associated with the change of position of an object in space within a certain amount of time.

The speed can be calculated using the expression:

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

<h3>Speed of Sam</h3>

In this case, you know:

displacement= 9 km
time= 2.5 h

Replacing in the definition of speed:

$speed= \frac{9 km}{2.5 h}$

Solving:

<u><em>speed= 3.6 </em></u> $\frac{km}{h}$

Finally, the speed of Sam is 3.6 $\frac{km}{h}$ .

Learn more about speed:

brainly.com/question/13803208

brainly.com/question/20725831

#SPJ1

3 0

2 years ago

A car travels at 15 m/s for 30 minutes. How far did it travel?

Brilliant_brown [7]

Answer:

27000 meters

Explanation:

15 x 60 x 30

5 0

3 years ago

Isotope A contains 56 protons and 80 neutrons. Isotope B contains 55 protons and 81 neutrons. Isotope C contains 57 protons and

ioda

mass number is defined as sum of number of protons and neutrons

so here for Isotope A

Isotope A contains 56 protons and 80 neutrons.

Mass number will be given as

$A = 56 + 80 = 136$

For Isotope B

Isotope B contains 55 protons and 81 neutrons.

$A = 55 + 81 = 136$

For Isotope C

Isotope C contains 57 protons and 80 neutrons.

$A = 57 + 80 = 137$

For Isotope D

Isotope D contains 56 protons and 74 neutrons.

$A = 56 + 74 = 130$

<em>So here Isotope A and Isotope B has same mass number</em>

3 0

3 years ago

Sound waves are longitudinal waves that can travel through air. Would you expect sound waves to travel faster through a low-dens

Serjik [45]

Answer:

Sound waves travel faster in a low-density gas

Explanation:

First of all, let's remind that sound waves are pressure waves: they consist of oscillations of the particles in a medium, which oscillate back and forth along the direction of motion of the wave (longitudinal wave).

The speed of sound in an ideal gas is given by the equation

$v=\sqrt{\gamma \frac{p}{\rho}}$

where

$\gamma$ is the adiabatic index of the gas

p is the gas pressure

$\rho$ is the gas density

From the equation, we see that the speed of sound is inversely proportional to the square root of the density: therefore, the lower the density, the faster the sound waves.

So, sound waves will travel faster in a low-density gas.

6 0

3 years ago

Endothermic reactions give off heat as they proceed. a. True b. False