Answer:
The Correct Answer is "D"
Explanation:
For Detail of this answer Please see the attached file.
Answer:
5501 kg/m^3
Explanation:
The value of g at the Earth's surface is

where G is the gravitational constant
M is the Earth's mass
is the Earth's radius
Solving the formula for M, we find the value of the Earth's mass:

The Earth's volume is (approximating the Earth to a perfect sphere)

So, the average density of the Earth is

Answer:
Concurrent forces are forces that pass through the same point. Resultant is a single force that can replace the effect of a number of forces. "Equilibrant" is a force that is exactly opposite to a resultant. Equilibrant and resultant have equal magnitudes but opposite directions.
Explanation:
ALL BASED ON RESEARCH HONEST ANSWER
Refer to the diagram shown below.
For dynamic balance,
1.5W - 2.5F = 0
W = (2.5*F)/1.5
= (2.5*40)/1.5
= 66.667 N
Because the lever is 80% efficient, the actual maximum load that can be lifted is
0.8*66.667 = 53.3 N
Answer: D. 53.3 N
Explanation:
It is given that,
A helicopter blade spins at exactly 100 revolutions per minute.
Its tip is 5.00 m from the center of rotation, r = 5 m
(a) Let v is the average speed of the blade tip in the helicopter’s frame of reference. Distance covered by the helicopter, 
In 100 revolutions, 
So, average speed of the blade tip in one second is given by :


v = 52.35 m/s
(b) The average velocity over one revolution is zero because the net displacement in one rotation is 0.
Hence, this is the required solution.