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3 years ago

HELP MEEEE, question number 5

Physics

1 answer:

Kryger [21]3 years ago

6 0

Answer:

Object A will get 200 & object B will get 400 Potential Energy

Explanation:

Potential Energy = mgh (mass x gravity x height)

For Object A :-

2 (mass) x 10 (approx gravity on Earth) x 10 (distance/height)

= 200

For Object B :-

4 x 10 x 10

= 400

Hence Object B will have High Potential Force than A.

Hope it helps. Thanks

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A magnetic field of 37.2 t has been achieved at the mit francis bitter national magnetic laboratory. Find the current needed to

jeka57 [31]

Answer:

Here is the complete question:

https://www.chegg.com/homework-help/questions-and-answers/magnetic-field-372-t-achieved-mit-francis-bitter-national-magnetic-laboratory-find-current-q900632

a) Current for long straight wire $=3.7\ MA$

b) Current at the center of the circular coil $=2.48\times 10^{5}\ A$

c) Current near the center of a solenoid $236.8\ A$

Explanation:

⇒ Magnetic Field due to long straight wire is given by (B),where $B=\frac{\mu\times I}{2\pi(r) },so\ I=\frac{B\ 2\pi(r)}{\mu}$

$\mu=4\pi \times 10^{-7}\ \frac{henry}{m}$

Plugging the values,

Conversion $1\times 10^6 A = 1\ MA$ ,and $2cm=\frac{2}{100}=0.02\ m$

$I=\frac{37.2\times \ 2\pi(0.02)}{4\ \pi \times (10^{-7})}=3.7\ MA$

⇒Magnetic Field at the center due to circular coil (at center) is given by, $B=\frac{\mu\times I (N)}{2(a)}$

So $I= \frac{2B(a)}{\mu\ N} = \frac{2\times 37.2\times 0.42}{4\pi\times 10^{-7}\times 100}=2.48\time 10{^5}\ A$

⇒Magnetic field due to the long solenoid, $B=\mu\ nI=\mu (\frac{N}{l})I$

Then $I=\frac{B}{\mu(\frac{N}{L})} \approx 236.8\A$

So the value of current are $3.7 MA$ , $2.48\times 10^{5} A$ and $236.8\ A$ respectively.

8 0

3 years ago

The area of a piston of a force pump is 8 X 10⁴m². What force must be

prisoha [69]

Answer:

Force of $37.44 * 10^{8}$ Kgm/s^2 must be applied to the piston to raise oil to a height of 6.0 m

Explanation:

As we know,

Pressure is the force per unit area

Or $P = \frac{F}{A}$

Force $= P * A$

Pressure is the product of density, gravitational constant and height

$P = 780 * 10 * 6$

Force

$= P * A\\= 780 * 10*6*8*10^4\\= 37.44 * 10^{8}$ Kgm/s^2

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3 years ago

A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii and are of uniform density. If the three are r

scZoUnD [109]

Answer:

A ) SOLID SPHERE

Explanation:

Moment of inertia of solid sphere = 2/5 M R²

= M K² , K is called radius of gyration

K = √2/5 R

Moment of inertia of solid cylinder = 1/2 M R²

= M K² , K is called radius of gyration

K = 1 /√2 R

Moment of inertia of solid sphere = M R²

= M K² , K is called radius of gyration

K = R

For rolling on inclined plane , acceleration

a = $\frac{gsin\theta}{1+\frac{K^2}{R^2} }$

Putting the value of K for solid sphere

a for solid sphere

a = g sinθ / ( 1 +2/5)

a = .714 g sinθ

Putting the value of K for solid cylinder

a for solid cylinder

a = g sinθ / ( 1 +1/2)

a = .666 g sinθ

Putting the value of K for hollow pipe

a for hollow pipe

a = g sinθ / ( 1 +1 )

a = . 5 g sinθ

So we see that acceleration a for solid sphere is greatest and a for hollow pipe is the least. Hence solid sphere will reach the bottom earliest and hollow pipe will reach the bottom the latest.

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3 years ago

12. In order to open locked doors in the future, the key is<br> _________________

omeli [17]

Answer: is so be smart and study hard you can always do it no mater what happens

Explanation:is this what you want

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3 years ago

A cricket ball of mass 800g has momentum of 20kg m/s , calculate velocity of ball?

larisa86 [58]

P=MV

V=P/M

20/800

0.025

8 0

4 years ago

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