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AleksAgata [21]
3 years ago
7

(b) Which has more mass: 50 cm of gold or 50 cm of aluminum? Explain.

Physics
1 answer:
monitta3 years ago
8 0
Gold’s molar mass is about 196 while aluminum is about 27, thus 50cm of gold has more mass
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A long, thin solenoid has 450 turns per meter and a radius of 1.06 . The current in the solenoid is increasing at a uniform rate
kirill115 [55]

Answer:9.34 A/s

Explanation:

Given

radius of solenoid R=1.06 m

Emf induced E=8.50\times 10^{-6} V/m

no of turns per meter n=450

we know Induced EMF is given by

\int Edl=-\frac{\mathrm{d} \phi}{\mathrm{d} t}=-\frac{\mathrm{d} B}{\mathrm{d} t}A

Magnetic Field is given by

B=\mu _0ni

thus \frac{\mathrm{d} B}{\mathrm{d} t}=-\mu _0n\frac{\mathrm{d} i}{\mathrm{d} t}

Area of cross-section

A=\pi R^2 where

solving integration we get

E.\cdot 2\pi r=\mu _0n\frac{\mathrm{d} i}{\mathrm{d} t}\pi R^2

where r=distance from axis

R=radius of Solenoid

\frac{\mathrm{d} i}{\mathrm{d} t}=\frac{Er}{\mu _0nR^2}

\frac{\mathrm{d} i}{\mathrm{d} t}=\frac{8.50\times 10^{-6}\times 3.49\times 10^{-2}}{4\pi \times 10^{-7}\times 450\times 1.06^2}

\frac{\mathrm{d} i}{\mathrm{d} t}=9.34 A/s

4 0
3 years ago
A bag of books took 3 minutes to move. You did 12,900 J of work. How much power was required to move the bag?
dlinn [17]
The answer is 38,700.
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3 years ago
A car traveling at a speed of 30 m/s encounters an emergency and comes to a complete
Natasha2012 [34]

Answer:

Explanation:

Use the one-dimensional equation

v_f=v_0+at which says that the final velocity of an object is equal to the object's initial velocity plus its acceleration times time. We are looking for time. That means the equation looks like this:

0 = 30 + (-4)t and

-30 = -4t so

t = 7.5 sec

4 0
3 years ago
Hawaii first drew the attention of the United States because _____.
dangina [55]
I think this answer would be D. It was seen as a refueling station for naval vessels
8 0
3 years ago
Read 2 more answers
Who is good at physics pls come here and help me!!1
mrs_skeptik [129]

Answer:

It wont change its mass

A

Explanation:

5 0
3 years ago
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