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3 years ago

8

Why are some rocks smooth and others rough?

1 answer:

klemol [59]3 years ago

6 0

It all depends on where the rock was found or former, often rocks in the ocean are smoother due to the strong currents over time while on land rocks tend to be rough but yet again it all depends on the location

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You have designed and constructed a solenoid to produce a magnetic field equal in magnitude to that of the Earth (5.0 10-5 T). I

saul85 [17]

Answer:

$I = 0.03637 A$

Explanation:

The given data in the question is

Magnetic field : $B = 5.0 \times 10^{-5} T$

Turns : $N = 350$

Length : $L = 32 cm = 0.32 m$

So, number of turns per unit length :

$n=\frac{N}{L}$

$n=\frac{350\: turns}{0.32 m}$

$n=1093.75 \: turns \: per \: meter$

If current is I , then magnetic field is given by

$B = \mu_{0} \times n \times I$

Also,

$I = \frac{B}{\mu_{0} \times n}$

Insert the values

$I = \frac{5.0 \times 10^{-5}}{4 \pi \times 10^{-7} \times 1093.75} A$

$I = 0.03637 A$

The current will be $I = 0.03637 A$

5 0

4 years ago

A 70-kg astronaut (including spacesuit and equipment) is floating at rest a distance of 13 m from the spaceship when she runs ou

Keith_Richards [23]

Answer:

Explanation:

mass of the astronaut including the spacesuit, $M=30$

distance of astronaut from the spaceship, d = 13 m

mass of the oxygen tank, m = 3 kg

Speed of tank with respect to spaceship, $v=15~m/s$

a)

<u>Using the conservation of linear momentum:</u>

total momentum before collision = total momentum after collision

$M.u=m.v+(M-m)v'$

$0=3\times 15+(70-15)\times v'$

$v'=0.82~m/s$

b)

She mush hold her breath until she reaches the spaceship, i.e.

$t=d/v'$

$t=13/0.82$

$t=15.89~s$

4 0

3 years ago

the strength of the pulling force on the moon is 1/6 of that on earth whilst on Jupiter it is 2.5 times stronger what is the wei

KiRa [710]

Weight is the force exerted on an object by gravity. So, weight of any object on the moon is 1/6 that on Earth.

6 0

3 years ago

A car drives 40km West, and then 160km North. What is the displacement of the car?

Galina-37 [17]

Answer: 1

Explanation:

8 0

3 years ago

Read 2 more answers

A coil consists of 180 turns of wire. Each turn is a square of side d=30 cm, and a uniform magnetic field directed perpendicular

alexira [117]

Answer:

Emf induced i equal to 329.4 volt

Explanation:

Note : Here i think we have to find emf induced in the coil

Number of turns in the coil N= 180

Sides of square d = 30 cm = 0.3 m

So area of the square $A=0.3\times 0.3=0.09m^2$

Magnetic field is changes from 0 to 1.22 T

Therefore $dB=1.22-0=1.22T$

Time interval in changing the magnetic field dt = 0.06 sec

Induced emf is given by

$e=-N\frac{d\Phi }{dt}=-NA\frac{dB}{dt}$

$e=-180\times 0.09\times \frac{1.22}{0.06}=329.4volt$

8 0

4 years ago