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3 years ago

What are all stars made of

1 answer:

7 0

Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores. Aside from our sun, the dots of light we see in the sky are all light-years from Earth. They are the building blocks of galaxies, of which there are billions in the universe. It’s impossible to know how many stars exist, but astronomers estimate that in our Milky Way galaxy alone, there are about 300 billion.

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a straight wire that is 0.60m long and carrying a current of 2.0a is placed at an angle with respect to a magnetic field of stre

Rashid [163]

Answer:

The angle is $\theta = 30^o$

Explanation:

From the question we are told that

The length of the wire is $l = 0.60 \ m$

The current is $I = 2.0 \ A$

The magnetic field strength is $B = 0.30 \ T$

The magnitude of the magnetic force is $F _b = 0.18 \ N$

Generally the magnetic force exerted on the wire is mathematically represented as

$F_b = I * l * B * sin \theta$

Making $\theta$ the subject

$\theta =sin^{-1} [ \frac{ F_b }{I * l * B } ]$

substituting values

$\theta =sin^{-1} [ \frac{ 0.18 }{ 2.0 * 0.6 * 0.3 } ]$

$\theta = 30^o$

8 0

2 years ago

During times of stress, Yanira notices that her heart pounds a little faster than normal. What part of the brain is responsible

Paul [167]

The Medulla is the part of our brain that helps regulate our involuntary life sustaining functions like breathing, swallowing, and controlling our heart rate!!

8 0

3 years ago

Read 2 more answers

a merry go round has a radius of 8 meters makes 2 revolutions every 2.5 minutes. A. express the angular speed of the merry go ar

pantera1 [17]

Answer:

a). $v=83.77x10^{-3} rad/s$

b). $v=0.8$ rpm

c).v=0.5865 m/sec.

Explanation:

Given:

$r=8m$

$v=\frac{2rev}{2.5minutes}$

a).

$2 rev*\frac{2\pirad}{1rev}=4\pi rad$

$t=2.5minutes*\frac{60s}{1minute}=150s$

The angular speed in radians per seconds is

$v=\frac{4\pi}{150s}=83.77x10^{-3} rad/s$

b).

$v=\frac{2rev}{2.5minute}rpm$

$v=0.8$ rpm

Child's distance per revolution

(pi*2r) = 43.988 metres.

v=(43.988 x 0.0133333) = 0.5865 m/sec.

4 0

3 years ago

A tow truck exerts a force of 3000 n on a car, accelerating it at 2 meters per second per second. what is the mass of the car?

Artemon [7]

If the force is 3,000 N and the acceleration is 2 m/s/s. The mass of the car is 1,500 grams (or whatever unit of mass or weight is used in the answer- pounds, kilograms e.t.c.).

6 0

3 years ago

A boy rides a bike 56 meters. It takes him 8 seconds. What is his speed?

lilavasa [31]

Answer:

7 meters per second or 7 m/s

8 0

3 years ago

Read 2 more answers