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3 years ago

Choose the description for a star cluster.

Physics

1 answer:

luda_lava [24]3 years ago

5 0

Answer:

It is number two

Explanation:

beacause a star cluster is a bunch of stars held together by gravity

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A painter sits on a scaffold that is connected to a rope passing over a pulley. The other end of the rope rests in the hands of

Doss [256]

Solution :

a). From Newtons second law,

F = ma

The total tension force is 2T.

∴ 2T - (m + M)g = (m+ M)a

Then

$a=\frac{2T-(m+M)g}{m+M}$

$a=\frac{2\times 600-(52+63)9.8}{52+63}$

$=0.63 \ m/s^2$

b). From the person,

F = ma

T - Mg + N = Ma

or N = Ma + Mg - T

= (63 x 9.8) + (52 x 9.8) - 600

= 617.4 + 509.6 - 600

= 527 N

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3 years ago

If |v|= 11, |w|= 23, |v-w|= 30, find |v+w|

GenaCL600 [577]

Answer:

$|v+w|=20$

Explanation:

We are given that

|v|=11

|w|=23

|v-w|=30

We have to find the value of |v+w|

|a-b|^2=(a+b)\cdot (a+b)=a^2+b^2-2|a||b|cos\theta

Using the formula

$(30)^2=(11)^2+(23)^2-2(11)(23)cos\theta$

$900=121+529-506cos\theta$

$900-121-529=-506cos\theta$

$250=-506cos\theta$

$cos\theta=-\frac{250}{506}$

$|a+b|^2=|a|^2+|b|^2+2a\cdot bcos\theta$

Using the formula

$|v+w|^2=(11)^2+(23)^2+2(11)(23)\times (-\frac{250}{506})$

$|v+w|^2=400$

$|v+w|^2=(20)^2$

$|v+w|=20$

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3 years ago

Sandy is on a road trip. She leaves at 8:00 AM. It takes her 2 hours to drive 200 kilometers. She stops at a rest stop for half

lutik1710 [3]

The average velocity of Sandy is given by the total distance covered S divided by the total time taken t:
$v= \frac{S}{t}$

The total distance covered is
$S=200 km+0+100 km=300 km$
while the total time taken is 2 hours + half an hour (for the rest) + 1 hour and half, so
$t=2h+0.5h+1.5 h=4 h$
Therefore, the average velocity is
$v= \frac{S}{t}= \frac{300 km}{4 h}=75 km/h$

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3 years ago

Why is summer hotter than winter? mastering astronomy?

BigorU [14]

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3 years ago

Look at the picture below to answer if u answer correctly i will mark you as brainliest.

alukav5142 [94]

Answer:

Explanation:

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3 years ago