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Lubov Fominskaja [6]
3 years ago
10

When there is a change of state, such as a solid to liquid or liquid to gas, heat energy can be added without a temperature chan

ge because A) the added energy is not needed. B) the energy is lost to the system. Eliminate C) the change of state requires energy. D) the energy is lost to the atmosphere.
Physics
1 answer:
Romashka-Z-Leto [24]3 years ago
3 0
I’m pretty sure the answer is C. Any change of state or movement requires energy
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From 0 seconds to 4 seconds is the acceleration positive or negative?
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Answer:

From 0 -4 seconds the acceleration is positive. (The graph is going upwards.)

From 6-10 seconds the acceleration is negative. (The graph is going downwards.)

7 0
4 years ago
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is appro
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Explanation:

It is given that,

Radius of the circular orbit, r=0.53\times 10^{-10}\ m  

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(a) The force acting on the electron is centripetal force. Its formula is given by :

F=\dfrac{mv^2}{r}

F=\dfrac{9.1\times 10^{-31}\times (2.2\times 10^6)^2}{0.53\times 10^{-10}}  

F=8.31\times 10^{-8}\ N

(b) The centripetal acceleration of the electron is given by :

a=\dfrac{v^2}{r}

a=\dfrac{(2.2\times 10^6)^2}{0.53\times 10^{-10}}

a=9.13\times 10^{22}\ m/s^2

Hence, this is the required solution.

5 0
3 years ago
A basketball with a mass of 1.5 kg is thrown with a force of 21 N at an angle of 60 degrees above the horizontal. What is the ve
sergey [27]

Answer:

b) 12.12 m/s² upwards

Explanation:

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4 years ago
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Gemiola [76]
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