2 years ago

True of false. Red stars are hotter than blue stars.

Physics

1 answer:

elena55 [62]2 years ago

8 0

Answer:

False

Explanation:

Blue stars are hotter than red stars

think of a working flame on a bunsen burner

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A ball is thrown horizontally from the top of a building 54 m high. The ball strikes the ground at a point 35 m horizontally awa

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Answer:

V=34.2 m/s

Explanation:

Given that

Height , h= 54 m

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Given that , the ball is thrown horizontally , therefore the initial vertical velocity will be zero.

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$V^2_y=U^2_y+2 g h$

Now by putting the values in the above equation we got

$V^2_y=U^2_y+2 g h$

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Thus

$V^2_y=1059.48$

$V_y=\sqrt{1059.48}\ m/s$

$V_y=32.54 m/s$

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$V_y=U_y+ g\times t$

$32.54=9.81\times t$

$t=\dfrac{32.54}{9.81}=3.31\ s$

In horizontal direction :

$x=U_x\times t$

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Thus the resultant velocity

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