A) Prevent (just imagine bushing a box up a ramp in your head)
Answer:
if we want to find force by using newton's law equation ( f = ma ) we have to use mass and acceleration not velocity ,but in this question they did not mention about acceleration but speed so the answer is D
Answer:
e. is definitely zero
Explanation:
Given that
At initial condition the speed of the pop cans is zero.
We know that linear momentum
P = Mass x velocity
P = m v
At initial condition v = 0
P= 0
If there is no any external force then the linear momentum of the system will be conserve.And given that ,consider the system isolated.
Therefore the answer is e.
Answer:
<h3>The answer is 45 J</h3>
Explanation:
The work done by an object can be found by using the formula
<h3>workdone = force × distance</h3>
From the question
distance = 3 meters
force = 15 newtons
We have
workdone = 15 × 3
We have the final answer as
<h3>45 J</h3>
Hope this helps you
Answer:
The Power output from Turbine B with the doubled blade will be X4 of the power output from Turbine A.
Explanation:
The Power generated by a wind turbine is governed by the equation:
P=0.5ρAV³
Where ρ= Air Density
A= Swept Area of the Blade =πr²
V= Wind Velocity
If they are subjected to the same wind, Air Density and Wind Velocity will be equal
For both turbines,
Let Air Density=1
Wind Velocity=1
Power from Turbine A = 0.5X1XπX1²=0.5π
Power from Turbine B (radius=2) = 0.5X1XπX2²=2π
Power from Turbine B/Power from Turbine A = 2π/0.5π=4