Answer: τ = 0
Explanation:
At constant angular velocity there is no angular acceleration therefore no torque.
τ = Iα
Explanation:
The efficiency of a machine is 70% means 30% of the applied force is wasted in overcoming friction and 70% of the applied force is used to do the work
The Earth is a sphere is a statement to describe a scientific law
D. Volume will increase
Volume and temperature are directly proportional for a gas.
Answer:
V = 90.51 m/s
Explanation:
From the given information:
Initial speed (u) = 0
Distance (S) = 391 m
Acceleration (a) = 18.9 m/s²
Using the relation for the equation of motion:
v² - u² = 2as
v² - 0² = 2as
v² = 2as
![v = \sqrt{2as}](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B2as%7D)
![v = \sqrt{2*18.9*391}](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B2%2A18.9%2A391%7D)
v = 121.57 m/s
After the parachute opens:
The initial velocity = 121.57 m/ss
Distance S' = 332 m
Acceleration = -9.92 m/s²
How fast is the racer can be determined by using the relation:
![V= \sqrt{v^2 + 2aS'}](https://tex.z-dn.net/?f=V%3D%20%20%5Csqrt%7Bv%5E2%20%2B%202aS%27%7D)
![V = \sqrt{121.57^2+ 2 (-9.92)(332)}](https://tex.z-dn.net/?f=V%20%3D%20%5Csqrt%7B121.57%5E2%2B%202%20%28-9.92%29%28332%29%7D)
V = 90.51 m/s