C to raise or lower lightweight objects
Answer:
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector. ... In its simplest form, average velocity is calculated by dividing change in position (Δr) by change in time (Δt).
Explanation:
Answer:
Explanation:
Let T be the tension in the cord.
Impulse by cord = change in momentum of block A .
T x 5s = 10 ( 2 -0) = 20
T = 4 poundal .
acceleration of block B = 2 / 5 = 0.4 m /s²
Net force applied on A = m ( g + a ) where m is mass of block B , a is acceleration of block B .
= 8 ( 32 + .4 ) = 259.2 poundal
Frictional force on block A = 259.2 - 4 = 255.2 poundal
μ x 10 x 32 = 255.2
320μ = 255.2
μ =0 .8 .
Answer:
The box should be placed at a distance of 
from the pivot
Explanation:
In order to be in static equilibrium, both Torques have to be the same magnitude, so:
Replacing the formula for Torque:
where X is the distance we need to find.
Solving for X we get:
As we can see, the distance does not depend on the actual value of the mass but on the fact of one being twice as much as the other one.
