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3 years ago

Do you divide mass by volume to get density

1 answer:

7 0

Density is the mass of an object divided by its volume. So the answer would be Yes. Hope it helps! (:

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Compute the resistance in ohms of a copper block 5.0 cm long and 0.10 cm2 in cross-sectional area. (ρ = 1.77 × 10-6 ohm-cm)

soldier1979 [14.2K]

R=ρ l/a
l=5 cm
a=0.10 cm²
ρ=1.77×10∧-6 Ωcm
R=(1.77×10∧-6) ×5/0.10
=8.85 ×10∧-5 Ω

resistance is directly proportional to length and inversly proportional to area of cross section is given by above equation

4 0

3 years ago

A solenoidal coil with 21 turns of wire is wound tightly around another coil with 350 turns. The inner solenoid is 22.0 cm long

Thepotemich [5.8K]

Answer:

(a)The average of magnetic flux trough each turns is $3.63 \times 10^{-8}$ wb.

(b) The magnitude of mutual inductance of the two solenoid is $1.596 \times 10^{-5}$ H.

(c)The magnitude of emf induced in the outer solenoid by changing current in the inner solenoid is 0.027132 v .

Explanation:

Given that,

The number of turns of the solenoid=N₁= 350

The diameter of the solenoid=D= 2.20 cm=0.022

The length of the solenoid is = $l$ = 22.0 cm=0.22 m

The second solenoid with $N_2$ = 21 turns which is wound around the solenoid at its center.

The current in the inner solenoid is $I_1$ = 0.150 A and is increasing at a rate of 1700 A/s i.e $\frac{dI_1}{dt}= 1700$ A/s

(a)

The formula of magnetic field of a solenoid is

$B=\mu_0 nI=\frac{\mu_0 N_1I_1}{l}$

$=\frac{(4\pi \times 10^{-7} T.m/A) (350)(0.15 \ A)}{0.220 \ m}$

$\approx 3.0 \times 10^{-4}$ T

So, the magnetic flux of each turns

$\phi = BA=B \pi (\frac d2)^2$

$=(3.0\times 10^{-4}\ T)\pi (\frac {0.022}{2} \ m)^2$

$=1.14 \times 10^{-7}$ wb

The average of magnetic flux trough each turns is $3.63 \times 10^{-8}$ wb.

(b)

Since the both coil wound tightly. So, the magnitude magnetic flux though each turns of both coils is same.

The mutual inductance of the two solenoid is

$M=\frac{N_2\phi}{I_1}$

$=\frac{(21)(1.14 \times 10^{-7}\ wb)}{0.15\ A}$

$=1.596 \times 10^{-5}$ H

(c)

The formula of emf is

$\varepsilon =-M\frac{dI_1}{dt}$

$=-(1.596\times 10^{-5}\ H) (1700 \ A/s)$

$=27.132 \times 10^{-3}$ v

=0.027132 v

The emf induced in the outer solenoid by changing current in the inner solenoid is 0.027132 v .

4 0

3 years ago

What is the potential energy of a spring that is compressed 0.65 m by a 25 kg block if the spring constant is 95 N/m?

Travka [436]

Answer:

D. 20J

Explanation:

5 0

3 years ago

If a car is moving to the left with constantvelocity, one can conclude thatthere mustbe no forces applied to the car.the netforc

laila [671]

Answer:Net Force is zero

Explanation:

Given

Car is moving to the left with constant velocity i.e. net force on the car is zero

because change in velocity with respect to time is acceleration thus force is also zero because net acceleration is zero

Mathematically

acceleration $=\frac{\Delta v}{\Delta t}$

as velocity is constant therefore $\Delta v=0$

thus a=0 , F=0

3 0

3 years ago

1. Our entire solar system orbits around the center of the Milky Way Galaxyabout once every 230 million years.

solmaris [256]

Answer: Hello! Apparently, your question is incomplete. Those were sentences in which you had to complete with missing information, so here we go:

1- Our entire solar system orbits around the center of the MILKY WAY GALAXY about once every 230 million years.

2- The Milky Way and Andromeda galaxies are among a few dozen galaxies that make up our LOCAL GROUP.

3 - The Sun appears to rise and set in our sky because Earth ROTATES once each day.

4 - You are one year older each time Earth ORBITS about the Sun.

5 - On average, galaxies are getting farther apart with time, which is why we say our UNIVERSE is expanding.

6 - Our SOLAR SYSTEM is moving toward the star Vega about 70,000 km/hr.

3 0

3 years ago