In the tetherball game, struck ball whirls around a pole. The vertical component of the tension balances the weight and the horizontal component of tension provides the centripetal force that points toward the center of the circle.
There are two forces acting on a tether ball as it is rotating in uniform circular motion. The force of tension acts along the rope while the weight acts in downward.
The ball will move in a circular motion due to centripetal force and the tether which keeps the ball linked to the pole pulling to the center. For centripetal force, the tether can be an actual object, like a chain, or it may be a force, like gravity that acts like a tether.
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2 valence electrons
Explanation:
Electron configuration of nickel (Ni):
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸
The valence electrons are in the electronic shell with the higher principal quantum number (n). In our case, nickel have 2 electrons in the 4s², with the n = 4.
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electrons in the valence level
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Answer:
T_ww = 43,23°C
Explanation:
To solve this question, we use energy balance and we state that the energy that enters the systems equals the energy that leaves the system plus losses. Mathematically, we will have that:
E_in=E_out+E_loss
The energy associated to a current of fluid can be defined as:
E=m*C_p*T_f
So, applying the energy balance to the system described:
m_CW*C_p*T_CW+m_HW*C_p*T_HW=m_WW*C_p*T_WW+E_loss
Replacing the values given on the statement, we have:
1.0 kg/s*4,18 kJ/(kg°C)*25°C+0.8 kg/s*4,18 kJ/(kg°C)*75°C=1.8 kg/s*4,18 kJ/(kg°C)*T_WW+30 kJ/s
Solving for the temperature Tww, we have:
(1.0 kg/s*4,18 kJ/(kg°C)*25°C+0.8 kg/s*4,18 kJ/(kg°C)*75°C-30 kJ/s)/(1.8 kg/s*4,18 kJ/(kg°C))=T_WW
T_WW=43,23 °C
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Answer:
![10\ \text{m/s}](https://tex.z-dn.net/?f=10%5C%20%5Ctext%7Bm%2Fs%7D)
Explanation:
= Displacement = ![100\ \text{m}](https://tex.z-dn.net/?f=100%5C%20%5Ctext%7Bm%7D)
= Time taken = ![10\ \text{s}](https://tex.z-dn.net/?f=10%5C%20%5Ctext%7Bs%7D)
Velocity is given by
![v=\dfrac{s}{t}\\\Rightarrow v=\dfrac{100}{10}\\\Rightarrow v=10\ \text{m/s}](https://tex.z-dn.net/?f=v%3D%5Cdfrac%7Bs%7D%7Bt%7D%5C%5C%5CRightarrow%20v%3D%5Cdfrac%7B100%7D%7B10%7D%5C%5C%5CRightarrow%20v%3D10%5C%20%5Ctext%7Bm%2Fs%7D)
The person is able to run at a speed of
in order to complete the race in the given time.