Answer: 8.81 J
Explanation: The scalar or dot product of 2 vector equals the product of the magnitude of both vectors and the cosine value of the angle between them
Magnitude of vector f (force) as given in the question = 12.5N
Magnitude of length = 0.75m
Angle between vectors = 25°
F. Δr = 12.5 * 0.75 * cos 25
F. Δr = 12.5 * 0.75 * 0.9063
F. Δr = 8.81 J
The dummy is moving with a speed 0 km/h relative to the seat in which it is sitting.
If the relative speed was non-zero, the dummy would move away from its seat, which contradicts the problem formulation.
Answer:
![5*10^{5} Joule](https://tex.z-dn.net/?f=5%2A10%5E%7B5%7D%20Joule)
Explanation:
Total rotational kinetic energy =![\frac{1}{2}*Inertia(angular speed)^{2}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%2AInertia%28angular%20speed%29%5E%7B2%7D)
(Here fly wheel may have translational kinetic energy but we ignore here)
Angular speed = 3000 revolutions per minute
Angular speed =
revolutions per second
Thus , Kinetic energy =![\frac{1}{2}*400\frac{3000}{60} ^{2}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%2A400%5Cfrac%7B3000%7D%7B60%7D%20%5E%7B2%7D)
= ![5*10^{5} Joule](https://tex.z-dn.net/?f=5%2A10%5E%7B5%7D%20Joule)
Answer:
tensional force
Explanation:
It usually exist in fluid or any liquid substance where by an object is put before it
e.g An ant can walk on water without submersed in it.
Hi there!
If they are in opposite direction:
- Let UP be the POSITIVE direction and DOWN be the NEGATIVE direction.
Thus:
∑F = 114.6 - 70.7 = 43.9 N upward
If they are in the SAME, downward direction:
∑F = -114.6 - 70.7 = -185.3
The magnitude is the absolute value, so:
|-185.3| = 185.3 N downward