The electric magnet (Electromagnetic) is temporary because you can turn it on and off. When it's power source is gone, the magnet becomes useless. Usually it's power source is a battery, but it could be solar with a switch. Hope this helps. Please give me brainliest is this helps you.
True true true truer than the
Answer:
False
Explanation:
The roller displacement at an external, friction less rotation pin is found to be zero as it has a support which is no-yielding but still provides rotation to the object where as at an external pin a shear force is present and the moment is absent which means that at an external pin its not the rotation that is absent but its the moment which comes out to be zero.
Refractive Index is the measure of bending of light rays.
Explanation:
- Index of refraction or Refractive Index is the measurement of the phenomenon exhibited by light rays - bending of light rays when passing from one medium to another.
- It can also be measured as the ratio between speed of light in vacuum or empty space to that of the speed of light in a given medium.
- Index of refraction is denoted by n and is calculated by the following formula
n = Speed of light in vacuum/Speed of light in the given medium = c/v
- It can also be measured using the angle of incidence and angle of refraction.
n = sin i/sin r where i is the angle of incidence and r is the angle of refraction
Answer:
c. 0.71 [s]
Explanation:
To solve this problem we must use the following equation of kinematics.
where:
Vf = final velocity = 0 (because when the ball reaches the top, there is no movement)
Vo = initial velocity = 7 [m/s]
g = gravity acceleration = 9.81 [m/s²]
t = time [s]
Note: The negative sign of the equation means that the movement is againts the direction of the gravity acceleration.
![0 = 7 - (9.81*t)\\t = 0.713 [s]](https://tex.z-dn.net/?f=0%20%3D%207%20-%20%289.81%2At%29%5C%5Ct%20%3D%200.713%20%5Bs%5D)
