At one particular moment, a 19.0 kg toboggan is moving over a horizontal surface of snow at 3.60 m/s. After 6.75 s have elapsed,
1 answer:
Answer:
Friction force acting on the toboggan is 10.13 N.
Explanation:
Momentum is defined as the product of mass and its velocity,i.e,
p = m × v
Thus, initial momentum will be :-
p₁ = 19.0 × 3.60
= 68.4 kg m/s
Final momentum will be ;_
p₂ = 19.0 × 0
= 0 kg m/s
Now, Force is defined as the rate of change of linear momentum,i.e,
F = dp/dt
Thus, F =
=
= - 10.13 N
Negative sign just signifies that force is acting in a direction opposite to the direction of motion.
You might be interested in
Answer:
Explanation:
Since the wire is infinitely long, we will use Gauss' Law:
We will draw an imaginary cylindrical surface with height h around the wire. The electric flux through the imaginary surface will be equal to the net charge inside the surface.
In that case, the net charge inside the imaginary surface will be the portion of wire with height h. Then the charge of that portion will be equal to
The left-hand side of the Gauss' Law is the flux through the imaginary surface. Since we choose our surface as a cylinder, of which we know the area, we do not have to take the surface integral.
where R is the radius of the imaginary cylinder.
Finally, Gauss' Law gives
The vector expression is
As you can see, the electric field is independent from the height h, since that is merely an imaginary cylinder to apply Gauss' Law. In the end, what matters is the charge density of the wire and the distance from the wire.