Answer:
it should be Work = F * d * cos(theta)
Explanation:
Force is mass * acceleration, and displacement is the distance between the starting and ending point.
we need theta because it can be used to calculate work when going up an incline surface. And we tend to use cosine because we are assuming that our motion is primarily in the X direction.
Use the relation between electric force and electric field and the concept of gravitational force to calculcate the electric field. The electric force is given by
And the gravitational force is
For the ball to float above the ground, the magnitude of electric force on the ball must be equal to the magnitude of the gravitational force. That is must be a equilibrium condition, so,
Replacing the values we have that,
Therefore the electric field magnitude that would cause the ball to float above the ground is 
Sure
"Mount Everest is 29,000 feet tall" or in scientific terms 2.9E4
This statement/observation is accurate to 2 decimal places. It is precise only to (perhaps) the nearest thousand feet.
More precise
"Mount Everest is 29,029 feet tall"
Answer:
F = 1500 [N]
Explanation:
To solve this problem we must use Newton's second law, which tells us that the sum of all forces must be equal to the product of mass by acceleration.
ΣF = m*a
F = 1000*1.5
F = 1500 [N]
