3 years ago

A compass is a magnet and Earth is a magnet. How does the magnetism of a compass work with the

Physics

1 answer:

Doss [256]3 years ago

7 0

The compass magnet aligns itself with the earths magnetic field.

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When did the Space Age begin?

Marta_Voda [28]

The Space Age began on October 4, 1957.

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3 years ago

Certain neutron stars (extremely dense stars) are believed to be rotating at about 50 rev/s. If such a star has a radius of 15 k

vesna_86 [32]

Answer: $M=49.95\times 10^{26} kg$

Explanation:

Given

$N=50 rev/s$

$\omega =2\pi N$

$\omega =2\pi \cdot 50=314.2 rad/s$

radius of neutron star $r=15 km$

Centripetal force on material having mass m is given by

$F_c=\frac{mv^2}{r}$

Gravitational Force between neutron star and mass m is

$F_g=\frac{GMm}{r^2}$ ,where M=mass of Neutron star

equating centripetal Force and Gravitational Pull

$\frac{mv^2}{r}=\frac{GMm}{r^2}$

$M=\frac{v^2r}{G}$

$M=\frac{\omega ^2r^3}{G}$

$M=\frac{(314.2)^2\times (15000)^3}{6.67\times 10^{-11}}$

$M=\frac{0.4995\times 10^17}{10^{-11}}$

$M=49.95\times 10^{26} kg$

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3 years ago

Estimate how much mass the Sun loses through fusion reactions during its 10-billion-year life. You can simplify the problem by a

Bess [88]

Explanation:

By using Einstein equation,

E = mc²

m = E/c²

As the sun's energy output remains constant, we are taking it as 3.839×10²⁶.

speed of light c = 299,729,458 m/s

by putting these values in above equation,

m = (3.839×10²⁶)/(299.729,458)²

m = 4.721×10⁹kg.

It is the mass that loss per second.

Now a year (including leap year) has 31,556,926 seconds. Thus the 10 billion years equal 1.348×10²⁷kg of total mass loss.

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3 years ago

A digital camera uses one 6 V battery. The circuit that runs the flash and takes the pictures has a resistance of 3 Ω . What is

Zolol [24]

Just apply Ohm's Law

I=V/R=6/3=2A

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3 years ago

Which statement describes all solids?

bazaltina [42]

The second one. Liquids have definite volume but indefinite shape, and gases have neither definite volume nor shape.

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3 years ago