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Svetach [21]
2 years ago
5

(Q020) Stars a. all explode cataclysmically when they die and contribute their matter to future star generations. b. begin as pr

otostars, which fire up when they collapse and become denser and hotter. c. have unlimited amounts of fuel and therefore exist indefinitely. d. create elements by splitting the nuclei of small atoms into the nuclei of larger atoms.
Physics
1 answer:
astra-53 [7]2 years ago
7 0

Answer:

Option (b).

Explanation:

A star is a heavenly body which emits a tremendous amount of energy by the reaction of nuclear fusion.

Sun is the smallest star in the universe.

The star stars from the proto star, this is the process of birth of a star. Then it collapse due to the gravitational pull and then it tarts emit light and energy and become a star.

After the long long time, it starts to decay and become a neutron star or the black hole.

So, the correct option is (b).

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Take a look at the weather map. The front seen there causes short periods of storms and heavy rains. What type of front is this?
erastova [34]
I am pretty sure it is a cold front.
5 0
3 years ago
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A river flows due south with a speed of 2.0 m/s. You steer a motorboat across the river; your velocity relative to the water is
neonofarm [45]

Answer:

a) 25.5°(south of east)

b) 119 s

c) 238 m

Explanation:

solution:

we have river speed v_{r}=2 m/s

velocity of motorboat relative to water is v_{m/r}=4.2 m/s

so speed will be:

a) v_{m}=v_{r}+v_{m/r}

solving graphically

v_{m}=\sqrt{v^2_{r}+v^2_{m/r}}

     =4.7 m/s

Ф=tan^{-1} (\frac{v_{r}}{v_{m/r}} )

  =25.5°(south of east)

b) time to cross the river: t=\frac{w}{v_{m/r}}=\frac{500}{4.2}=119 s

c) d=v_{r}t=(2)(119)=238 m

note :

pic is attached

6 0
3 years ago
A truck is moving around a circular curve at a uniform velocity of 13 m/s. If the centripetal force on the truck is 3,300 N and
Paladinen [302]
Answer: Option B.

Since here the truck is moving on a circular track, it will experience centripetal force.

F(centripetal) = m × acc 
or 
r = \frac{m v^{2}}{F}

where r is the radius of the track. 
m is the mass of truck
v is the speed  of the truck. 
Given: v = <span>13 m/s
m = </span><span>1,600 kg
</span>F = 3300 Newton

To find = radius of track=?
r = \frac{m v^{2} }{F}
r = \frac{1600*13*13}{3300}
r = 81.94 m
Therefore, radius of track is 81.94 m
4 0
3 years ago
Read 2 more answers
Why is the answer A and not C?<br>please help!​
MariettaO [177]

Answer:

because it gives a complete thought

4 0
2 years ago
An object in motion will have a speed which is a scaler , or ( blank ) which is a vector .
mylen [45]

Answer:

Velocity

Explanation:

Objects in motion usually have a speed which is scalar or velocity which is a vector.

A scalar quantity is one with magnitude but has no directional attribute.

A vector quantity is one with both magnitude and directional attribute.

Speed is a scalar quantity that describes the magnitude of motion a body accrues.

Velocity is a vector quantity that describes both the magnitude of motion and the direction of motion in a body.

3 0
3 years ago
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