Answer:
i know the questin but i got to try and find it
Explanation:
A, Mechanical and A, Chemical.
Answer:
C
Sign-Negative
Explanation:
We are given that
Electric field =
(Radially downward)
Acceleration=
(Upward)
Mass of charge=3 g=
kg
1kg=1000g
We have to find the magnitude and sign of charge would have to be placed on a penny .
By newton's second law


Substitute the values then we get

Substitute the values then we get




C
Sign of charge =Negative
Because electric force acting in opposite direction of electric field therefore,charge on penny will be negative.
Refraction is the change in direction of a wave.
Diffraction is the bending of a wave around a barrier.
Answer:
C
Explanation:
A magnetic field exerts its force beyond just direct touch.