Kinetic Energy:
K E= m g h
h = 10 m, d = 5 m.
m g ( h + d ) - F d = 0
m g ( h + d ) = F d
70 * 9.8 * 15 = F * 5
10,290 = 5 F
F = 10,290 : 5
F = 2,058 N
Answer:
The correct option is C
Explanation:
From the question we are told that
The wavelength is 
The angle is 
The order of maxima is n = 3
Generally for constructive interference

=> 
=> 
=> 
=> 
Answer:
754.6 m
Explanation:
The GPE (Gravitational potential energy) of an object with respect to the ground is given by

where
m is the mass of the object
g = 9.8 m/s^2 is the acceleration due to gravity
h is the heigth above the ground
Here we have
m = 12,400.05 kg is the mass
GPE = 91,700,000.00J is the GPE
Solving the formula for h, we find the heigth:
