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lara31 [8.8K]
3 years ago
11

EASY 15 POINTS❗️❗️

Physics
2 answers:
loris [4]3 years ago
4 0

Answer:

(A)

Explanation:

when water freezes it expands

Aliun [14]3 years ago
3 0

Answer:a

Explanation:I think a is correct bc as you can see water has froze

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A soccer ball of diameter 22.6cm and mass 426g rolls up a hill without slipping, reaching a maximum height of 5m above the base
-Dominant- [34]

Answer with Explanation:

We are given that

Diameter=d=22.6 cm

Mass,m=426 g=426\times 10^{-3} kg

1 kg=1000 g

Radius,r=\frac{d}{2}=\frac{22.6}{2}=11.3 cm=11.3\times 10^{-2} m

1m=100 cm

Height,h=5m

I=\frac{2}{2}mr^2

a.By law of conservation of energy

\frac{1}{2}I\omega^2+\frac{1}{2}mv^2=mgh

\frac{1}{2}\times \frac{2}{3}mr^2\omega^2+\frac{1}{2}mr^2\omega^2=mgh

v=\omega r

gh=\frac{1}{3}r^2+\frac{1}{2}r^2=\frac{5}{6}r^2\omega^2

\omega^2=\frac{6}{5r^2}gh

\omega=\sqrt{\frac{6gh}{5r^2}}=\sqrt{\frac{6\times 9.8\times 5}{5(11.3\times 10^{-2})^2}}=67.86 rad/s

Where g=9.8m/s^2

b.Rotational kinetic energy=\frac{1}{2}I\omega^2=\frac{1}{2}\times \frac{2}{3}mr^2\omega^2=\frac{1}{2}\times \frac{2}{3}(426\times 10^{-3})(11.3\times 10^{-2})^2(67.86)^2=8.35 J

Rotational kinetic energy=8.35 J

6 0
4 years ago
Los rieles de una vía de tren de acero tienen 1500 m de longitud. ¿Qué longitud tendrá cuando
melomori [17]

Answer:

can you translate the question

into english

6 0
3 years ago
PLEASE HELP ASAPPPPPPPPP
Svetlanka [38]
60kg would be the answer
8 0
3 years ago
Which question would most likely fill in the blank
Citrus2011 [14]
Definitely not the last 2. My bet is on the first option. If it is wrong don't hit me please...
8 0
3 years ago
The water in the plumbing in a house is at a gauge pressure of 300,000 pa. What force does this cause on the top of the tank ins
liraira [26]

Answer:

60 000 N

Explanation:

1 pa = 1 N/m^2

you have 300 000 of these   = 300 000 N /m^2

    but only an area of .2 m^2

                    300 000 N / m^2  * .2 m^2 = 60 000 N

3 0
2 years ago
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