2 years ago

Read this excerpt from Through the Looking-Glass by Lewis Carroll.

Physics

2 answers:

iren [92.7K]2 years ago

7 0

Answer:

It would be D. “I wouldn't mind being a Pawn, if only I might join—though of course I should LIKE to be a Queen, best.

Explanation:

Serhud [2]2 years ago

6 0

Answer:

Explanation:

i did the tested

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Is pulling a dog a contact force or a non contact force

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A contact force since you are making physical contact with the dog

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Some enterprising physics students working on a catapult decide to have a water balloon fight in the school hallway. The ceiling

sergejj [24]

Answer:

$\alpha =54.7$ º

Explanation:

From the exercise we have our initial information

$y=3.4m\\v_{o}=10m/s\\g=-9.8m/s^2$

When the balloon gets to the ceiling its velocity at that moment is 0 m/s. Being said that we can calculate velocity at the vertical direction

$v_{y}^2=v_{oy}^2+ag(y-y_{o})$

Since $v_{y}=0$ and $y_{o}=0$

$0=v_{oy}^2-2(9.8m/s^2)(3.4m)$

$v_{oy}=\sqrt{2(9.8m/s^2)(3.4m)}=8.16m/s$

Knowing that

$v_{oy}=v_{o}sin\alpha$

$sin\alpha =\frac{v_{oy} }{v_{o} }$

$\alpha =sin^{-1}(\frac{v_{oy}}{v_{o}})=sin^{-1}(\frac{8.16m/s}{10m/s})=54.7$ º

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2 years ago

Which two things determine an object’s momentum?

son4ous [18]

Momentum (in terms of classical mechanics) is defined as p = m*v, where m is the mass and v is the velocity.

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A total of 54.0 Joules of heat are absorbed as 58.3 g of lead is heated from 12.0° C to 42.0° C. What is the specific heat of le

DedPeter [7]

to increase the temperature of lead we know that the formula of heat required is given as

$Q = ms\Delta T$

here we know that

$Q = 54 J$

m = 58.3 g

$\Delta T = T_f - T_i$

$\Delta T = 42 - 12 = 30 ^0C$

now from the above equation we have

$54 = 0.0583*s *30$

$54 = 1.75*s$

$s = 31 J/kg ^0C$

also we can write its as

$s = 0.031 J/g ^0C$

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2 years ago

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