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3 years ago

Which "sphere" does an astronomer most directly study?

Physics

2 answers:

Allushta [10]3 years ago

7 0

Answer:

exosphere

Explanation:

exosphere is space

astronomy is space

Lisa [10]3 years ago

5 0

I would choose B. exosphere. Astronomers study outer space, planets and ect.

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A wire carries a 11.3-mA current along the +x-axis through a magnetic field = (16.2 + 2.4 ĵ) T. If the wire experiences a force

adelina 88 [10]

Answer:

The length of the wire is 579 m

Explanation:

Given;

current on the wire, I = 11.3-mA

magnetic field of the wire, B = (16.2i + 2.4 ĵ) T

Magnitude of force experience by the wire, F = 15.7 N

Magnitude of force experience by current carrying wire at a given a magnetic field strength is calculated as;

F = BILsinθ

Where;

B is magnitude of magnetic field

F is the force on the wire

L is length of the wire

θ is direction of the magnetic field

$B = \sqrt{16.2^2 +2.4^2} = \sqrt{268.2} = 16.377 \ T$

$tan \theta = \frac{2.4}{16.2} \\\\tan \theta = 0.1482\\\\\theta = tan^{-1}(0.1482) \\\\\theta = 8.43^o$

Length of the wire is calculated as;

$L = \frac{F}{BIsin \theta} = \frac{15.7}{16.377*11.3*10^{-3}*sin(8.43)} = 578.9 \ m$

Therefore, the length of the wire is 579 m

5 0

3 years ago

Twin skaters approach each other with identical speeds. Then, the skaters lock hands and spin. Calculate their final angular vel

kherson [118]

Answer:

$\omega=3.135rad/s$

Explanation:

From the question we are told that:

initial Speed $V_1=2.50$

Mass $m=70.0kg$

Center of mass $d=0.0.800m\$

Generally the equation for angular velocity is is mathematically given by

$\omega=\frac{v}{r}\\\\\omega=\frac{2.50}{0.0800}$

$\omega=3.135rad/s$

5 0

3 years ago

A sports car accelerates at a constant rate from rest to a speed of 90 km/hr in 8 s. What is its acceleration?

AfilCa [17]

First convert 90km/hr to m/s.

Initiate velocity = 0m/s (car was at rest)

Final velocity is 25m/s (90km/hr converted)

25m/s - 0m/s / 8s = 3.125 m/s^s

Therefore the answer is option A (3.13m/s^2)

3 0

3 years ago

in the history of astronomy, which of the following is true? a. galileo galilei was a student of tycho brahe. b. johannes kepler

bija089 [108]

C. Ptolemy argued that earth was the center of the universe

7 0

3 years ago

A force of 20 N is executed to raise a rock weighing 30 N. What is the actual mechanical advantage?

xxMikexx [17]

I am absolutely sure its 1.5

5 0

3 years ago

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