Explanation:
Load=800N
Effort=200N
1. Mechanical Advantage = LOAD/EFFORT
= 800N/200N
= 4
2 Velocity Ratio = no. Of pulleys =5
3. Efficiency = Mechanical advantage / velocity ratio × 100%
= (4/5)×100%
=80%
4. output work= load×load distance
= 800N × 5m
= 4 × 1000J
5. Efficiency = (output work/input work) ×100%
Or, 80% = (4000J/input work) ×100%
Or, 80%/100% = 4000J/inputwork
Or, 4/5 = 4000J/inputwork
Or, input work =4000J × 5/4
Input work = 5×1000J
I hope it helped! ;-)
We can solve the problem by using Netwon's third law:
where:
T is the orbital period of the planet
R is the average radius of the orbit (so, the average distance of the planet from the star)
M is the mass of the star.
First, we need to convert the period and the radius into SI units:
And then, re-arranging the formula and substituting the numbers we find
A thermal conductor is an item that can conduct thermal energy or temperature, much like a knife.
Metals often feel cool to the touch because the are thermal conductors, storing cool energy making them feel cooler.
Using thermal energy is like taking a knife and warming it up so it can better cut through objects.
Answer:
A package is dropped from a helicopter moving upward at 15 m/s. If it takes 16.0 s before the package strikes the ground, how high above the ground was the package when it was released? (Disregard air resistance.)
Show step by step please.
Note: The answer is given it's should be 1000 m ??
This what i can up with so see what it is kid
Explanation: