Question

different quartz clock and atomic clock​

Answer 1

Explanation:

Atomic clocks are actually quartz clocks—just like the ones you have at home. The difference is that an ordinary quartz clock relies purely on the oscillations of its quartz crystal to count seconds.

Answer 2

Answer:

A 4 metre long uniform ladder with the weight of 120 Newton leans against a wall making 70 degree above cement floor. assuming the wall is frictionless but the floor is not determine the forces exerted on the ladder by the floor and by the wall.

(ans would be 122N)