Newton's second law is:
F=m*a,
where a=dv/dt, so
F=m*(dv/dt)
Rearranging gives:
F*dt=m*dv.
Basic integration gives:
F*t=m(vf-v0),
where vf and v0 are the final and initial velocities of the object respectively.
In your case vf=0, because the ball stops completely, and v0=10m/s.
Rearranging the last expression gives F=(m(vf-vo))/t.
Plug in numbers to find F=(2*10)/0.03=666.6 N
Answer:
Explanation:
The specific gravity is given by,
Now, in order to calculate the uncertainty (relative error) in G, we must first take log (base e) on both sides of the equation,
Differentiating the above equation,
The second term is zero because it is known that and hence a constant.
Putting the appropriate values, we get,
Therefore, uncertainty in G =
ΔE = Ef - Ei = (Uf + Kf) - (Ui + Ki) = (mgh + 0) - (mgh +0)
ΔE = mghf - mghi = 1(9.8)(1.5) - 1(9.8)(2) = -4.9 J
The total energy of the system decreases by 4.9 J so that must mean that 4.9 J is converted into other forms of energy and in this case it is heat.
The snwer would have to be a
No not all, because not all electrical field attract and repel