Answer:
Repeated
Explanation:
An experiment must be done multiple times to prove its validity.
hope this helps- Cam ♡
Answer:
Peer Review
Explanation:
When scientist check other scientists the process is dubbed "peer review".
True
A scientific law only states that an event occurs.
Hope this helps!
The crate moves at constant velocity, this means that its acceleration is zero, so the net force acting on the crate is zero (Newton's second law).
There are only two forces acting on the crate: the force F applied by the worker and the frictional force, acting in the opposite direction:

, where

is the coefficient of friction and

is the mass of the crate. Since the net force should be equal to zero, the two forces must have same magnitude, so we have:

And so, this is the force that the worker must apply to the crate.