A box moving to the right experiences four forces, as shown. Key
F = 10 N
F = Normal Force
F, = Friction Force
F Force due to Gravity
FA = Applied Force
F, = 15 N
F = 15 N
F = 10 N
If these forces are applied for a given time interval, t, which statement describes what the box will do during
that time?
A. The box will slow down during the time interval.
B. The box will maintain a constant velocity.
C. The box will speed up during the time interval.
D. The box will change direction but not speed.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.