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3 years ago

Extremely high temperatures and pressures are necessary for fusion reactions to take place in stars. TRUE or FALSE.

Physics

2 answers:

Anton [14]3 years ago

8 0

I think the answer is True

Yanka [14]3 years ago

3 0

The answer is true as a result of the fusion hydrogen atoms are converted into helium and energy is released in stars to produce fusion reaction.

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Change to Kelvin 60 degree Celicius؟

nikitadnepr [17]

Answer:

-213

Explanation:

c=k-273
c=60-273
ans = -213°C

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3 years ago

In order to measure motion,one needs to observe?

Mrrafil [7]

The answer would be A

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3 years ago

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A camera phone called the iPhone X has an image sensor size of 5 mm and a focal length of 4 mm. How long of a selfie-stick must

azamat

Answer:

length of selfie-stick is 1.62 m

Explanation:

Given data

image size h1 = 5 mm = 5 × $10^{-3}$ m

focal length = 4 mm = 4 × $10^{-3}$ m

distance h2 = 2.032 m

to find out

How long of a selfie-stick

solution

here we find first magnification

that is M = h1 /h2

M = 5 × $10^{-3}$ / 2.032

M = 2.46 × $10^{-3}$

and we know M = p/q

so p = Mq = 2.46 × $10^{-3}$ q

so we apply lens formula

1/f = 1/p - 1/q

1/ 4 × $10^{-3}$ = 1 / 2.46 × $10^{-3}$ q - 1/q

q = 1.622 m

so length of selfie-stick is 1.62 m

4 0

4 years ago

Where is the sun located in the galaxy?

GarryVolchara [31]

I think it's 3. within an outer arm

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3 years ago

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You're sitting in the back of a taxi and place your bag on the seat next to you. The taxi enters a traffic circle and travels th

svp [43]

Answer:

(d) III only

Explanation:

We have to observe the motion of the bag with respect to taxi , considering taxi as stationary or inertial frame . Since bag is not moving with respect to taxi , the inertial frame that means , net force on it is zero .So option i and ii are ruled out .

Now how to explain motion of the bag ie why it is stationary ie what are the balancing force acting on it. We know that on a body on circular path , a force called centripetal force is acting on it . So that force must be acting on it . The balancing force is the frictional force which is keeping it stationary with respect to taxi . Hence the third option is correct.

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3 years ago