Answer:
One of the most important reasons for grounding electrical currents is that it protects your appliances, your home and everyone in it from surges in electricity. If lightning was to strike or the power was to surge at your place for whatever reason, this produces dangerously high voltages of electricity in your system.
Explanation:
Ли делать лазерную коррекцию в России и Казахстана в том числе в области образования и культуры и д на русском для
Answer:
Explanation:
A 26-kg crate, initially at rest on a horizontal surface, requires a 72-N horizontal force to set it in motion.
Maximum Frictional force on stationary object F = μs R where μs is coefficient of static friction and R is reaction of ground which is equal to weight for object placed on horizontal surface .
F = μs x mg
Given F = 72 , m = 26
72 = 26 x 9.8 x μs
μs = .28
Kinetic friction : ---
Frictional force on moving object F = μk R where μk is coefficient of kinetic friction and R is reaction of ground which is equal to weight for object placed on horizontal surface .
F = μk x mg
Given F = 72 , m = 26
54 = 26 x 9.8 x μk
μk = .21
Answer:
*1) 100 Joule energy
*2) 101.2 m/s
Explanation:
*1) 1J = 1w
100J = 100w
*2) A 70-kg person will have to run at a speed of 101.2 m/s to have that amount of kinetic energy.