Answer:
900J
Explanation:
w =f×s
60×15
=900J
thus the k.e of the body is 900j
Answer:
Explanation:
Given
mass of disk 
diameter of disc 
Force applied 
Now this force will Produce a torque of magnitude



And Torque is given Product of moment of inertia and angular acceleration 

Moment of inertia for Disc 



Answer:
H=Hydrogen, PO4=Phosphate
Explanation:
Reactions are on the left side of arrow and products are on the right side of arrow.
For this case we have that according to Newton's second law it is true that:

Where:
F: It is the force
m: It is the mass
a: It is the acceleration
According to the data we have:

So, we have:

Thus, the applied force will be 7 Newtons.
Answer:

Explanation:
The given data is as follows.
= 0.25 m, q = 5.90 mC = 
= 0.35 m, q = 1.70 mC = 
(a) Now, we will calculate the electric potential as follows.
V = 
First, we will calculate the initial and final electric potential as follows.
= 
or, = 
= 
or, = 
Hence, the value of change in electric potential is as follows.

= 
=
V
Therefore, the difference in electric potential energy is
V.
(b) Now, we will calculate the potential energy as follows.
P.E = qV
=
V
= 
Therefore, the change in the system's electric potential energy is
.