Aman pushes on a 12kg object for 10 seconds. it moves 8 m to the right while he is pushing it.
a. calculate the acceleration of the mass
b. now use f=ma to calculate the magnitude of the man's force.
c. if the surface is frictionless, how does v3 compare to v2? why?
d. if the surface has friction, how does v3 compare to v2? why?

Explanation:

So for part a you know:

mass: irrelevant for first part

time

distance traveled

And i believe you can assume it starts at rest

So use x= v0t + 1/2at^2

8= 0(10) +1/2a(10)^2

So simplifying the first part of the equation becomes zero and the next part become 50a

Leaving you with 8=0+50a

so a =8/50

Part B

use f=ma to solve the force

f= (12kg) * (8/50)= 1.92

Par c and d im not sure what you mean by v2 and v3

Hope this at least helped with the first two parts

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: