To solve this problem we will apply the concepts related to Newton's second law for which the product of mass and acceleration is defined as the force applied to an object. Mathematically this is,
Here,
Net external Force
m = Mass of the body
a = Acceleration
The net force on the body would be given by the difference between the ascending force and the weight, therefore,
Here,
F = Upward Force
W = Weight
The Weight is,
Then the is
Finally replacing at the first equation we have,
Therefore the acceleration of the stone is
Answer:
The work done is
Explanation:
1. Define the formula of work.
In this case the work (W) done is the result of add up the kinetic energy and the potential energy , and subtract them at the initial and final states:
Replacing expressions:
In the initial state at the bottom of the stairs both kinetic and potential energy are equal to zero, because kinetic energy depends on velocity and her initial velocity is zero, and potential energy depends on height and her initial height is zero too.
So the work done is defined by:
(Eq.1)
2. Calculate the height:
The height of the stairs is 19m
3. Convert the mass of the woman from lbs to kg:
The woman heights 61kg
4. Replace values in (Eq.1):
Answer:
Explanation:
Given
Dimension of Plastic sheet is
Charge on sheet
Charge density
Sphere has mass of
If sphere is suspended motionless then its weight is balanced by repulsion force
Repulsive force
where E=Electric field due to sheet
Answer:
<em>a. q=450 c
</em>
<em>b. E=675 J
</em>
Explanation:
<u>Direct Current (DC)
</u>
It's the flow of electric charges in one direction driven by a constant voltage circuit. The intensity of the current flow is computed as
Where q is the constant flow of charge in time t
The energy of an element providing Voltage V, current I during a time t is
a. The charge can be computed by solving the first equation for q
b. The energy transferred by the battery is
‘All neon lights are colored by
the color of the tubing’ is NOT true regarding neon lights. The answer is
letter B. Neon lights are emitted as electrons in a gas tube, it consist of helium
and krypton and each gas produces its own distinctive color.