3 years ago

Help please fill in the blank

Physics

2 answers:

adoni [48]3 years ago

8 0

Sun spots and photosphere.

umka21 [38]3 years ago

7 0

Answer:

sunspots; photosphere

Explanation:

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Answer:

D) 1.0m/s^2

Explanation:

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A phonograph record accelerates from rest to 28.0 rpm in 5.73 s.

Arturiano [62]

Answer:

a) $\alpha=0.5117\ rad.s^{-2}$

b) $\theta=8.4\ rad$

Explanation:

Given:

initial rotational speed of phonograph, $\omega_i=0\ rad.s^{-1}$

final rotational speed of phonograph, $N_f=28\ rpm \Rightarrow \omega_f=2\pi\times\frac{28}{60} =2.932\ rad.s^{-1}$

time taken for the acceleration, $t=5.73\ s$

Now angular acceleration:

$\alpha=\frac{\omega_f-\omega_i}{t}$

$\alpha=\frac{2.932-0}{5.73}$

$\alpha=0.5117\ rad.s^{-2}$

Using eq. of motion:

$\theta=\omega_i.t+\frac{1}{2} \alpha.t^2$

$\theta=0+\frac{1}{2}\times 0.5117\times 5.73^2$

$\theta=8.4\ rad$

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A 4-kg block is connected by means of a massless rope to a 2-kg block as shown in the figure. Complete the following statement:

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Less than 0.5, but greater than 0

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