Answer:

Explanation:
Given that,
The mass of a Moon, 
The mass of the Earth, 
The moon's mean orbit distance around the earth is, 
We need to find the gravitational force exerted on the moon by the Earth.
The formula of gravitational force is given by :

So, the required force is
.
Answer: The correct answer is Image B.
Explanation: For an object to accelerate, there should be unbalanced forces present. An object will move in the direction of net force.
Balanced forces are defined as the forces acting on the same object which are equal in magnitude but act in opposite direction. The net forces are 0.
Unbalanced forces are defined as the forces acting on the same object which are unequal in magnitude. The net force is non-zero.
For the given images:
Image A: This box will accelerate easily because the net force is non-zero and is moving in right direction.
Image B: This box will not accelerate because the net force is zero as all the forces are balancing one another. Hence, the object will stay at rest.
Image C: This box will accelerate easily because the net force is non-zero and is acting in between the normal and applied force.
Image D: This box will accelerate easily because the net force is non-zero and is moving in right direction.
Hence, the correct option is Image B.
Answer:
4.3 g/cm³ or 4.3g/cc
Explanation:
Volume(V) = Height × Length × Width
= 5cm × 3cm × 2cm
= 30cm³
Mass(m) = 129gram
So,
Density = m/V
= 129g/30cm³
= 4.3g/cc or 4.3g/cm³
Answer:

Explanation:
I = Hearing intensity = 
A = Area = 
d = Diameter = 7.9 mm
r = Radius = 
Power is given by

t = Time the eardrum is exposed to sound = 1 second
Energy is given by

The energy transferred to the eardrum is 
well yes i believe the arms and legs count as levers