Answer:
Newton's third law of motion states that for every action, there is equal and opposite reaction.
While space walking, when the astronaut gets detached from the space ship, she floats in space holding a wrench. In order to get back to the spaceship, she should throw the wrench in the opposite direction of the spaceship. This action would cause a reaction on her own body and she would be pushed away from the wrench and towards the spaceship. Thus, she can return back to the spaceship in this way.
Additionally, the coefficient of thermal expansion of the restorative material should be comparable to the coefficient of thermal expansion of the tooth structure, since a significant difference between the two could result in thermal-induced stress at the cavity wall and subsequent marginal failure.
This study's objective was to assess how thermal stress affected the marginal integrity of restorative materials with various adhesive and thermal characteristics. As an alternative to clinical trials, which are expensive and time-consuming, evaluation of restorative materials under laboratory simulations of clinical function is frequently carried out. Thermal cycling regimens, which are in vitro techniques that subject the restoration and the tooth to extremely high temperatures, are frequently used in laboratory simulations to replicate thermal stresses that naturally occur in vivo.
Learn more about Thermal Stress here-
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Answer:
The specific heat capacity of steel is lower than the specific heat capacity of wood
Explanation:
THERE IS ONLY 1 ON MY assignment i geot dis right please brainlyist
Answer:
![a = 2.77~{\rm m/s^2}](https://tex.z-dn.net/?f=a%20%3D%202.77~%7B%5Crm%20m%2Fs%5E2%7D)
Explanation:
Since the pulley has a mass concentrated on its rim, the pulley can be considered as a ring.
The moment of inertia of a ring is
![I = mr^2 = (2.3)(23.5\times 10^{-2})^2 = 0.127](https://tex.z-dn.net/?f=I%20%3D%20mr%5E2%20%3D%20%282.3%29%2823.5%5Ctimes%2010%5E%7B-2%7D%29%5E2%20%3D%200.127)
The mass on the left is heavier, that is the pulley is rotating counterclockwise.
By Newton's Second Law, the net torque is equal to moment of inertia times angular acceleration.
![\tau = I \alpha](https://tex.z-dn.net/?f=%5Ctau%20%3D%20I%20%5Calpha)
Here, the net torque is the sum of the weight on the left and the weight on the right.
![\tau = m_1gR - m_2gR = (1.65)(9.8)(23.5\times 10^{-2}) - (1)(9.8)(23.5\times 10^{-2}) = 1.497~{\rm Nm}](https://tex.z-dn.net/?f=%5Ctau%20%3D%20m_1gR%20-%20m_2gR%20%3D%20%281.65%29%289.8%29%2823.5%5Ctimes%2010%5E%7B-2%7D%29%20-%20%281%29%289.8%29%2823.5%5Ctimes%2010%5E%7B-2%7D%29%20%3D%201.497~%7B%5Crm%20Nm%7D)
Applying Newton's Second Law gives the angular acceleration
![\tau = I\alpha\\1.497 = 0.127\alpha\\\alpha = 11.78~{\rm rad/s^2}](https://tex.z-dn.net/?f=%5Ctau%20%3D%20I%5Calpha%5C%5C1.497%20%3D%200.127%5Calpha%5C%5C%5Calpha%20%3D%2011.78~%7B%5Crm%20rad%2Fs%5E2%7D)
The relation between angular acceleration and linear acceleration is
![a = \alpha R](https://tex.z-dn.net/?f=a%20%3D%20%5Calpha%20R)
Then, the linear acceleration of the masses is
![a = 11.78 \times 23.5\times 10^{-2} = 2.77~{\rm m/s^2}](https://tex.z-dn.net/?f=a%20%3D%2011.78%20%5Ctimes%2023.5%5Ctimes%2010%5E%7B-2%7D%20%3D%202.77~%7B%5Crm%20m%2Fs%5E2%7D)