Answer:
M = I A definition of magnetic moment - current * area
A = π R^2 = π * (6.4E6)^2 = 1.3E14 m^2
I = 8E22 A-m^2 / 1.3E14 m^2 = 6.2E8 amperes
I = 620,000,000 amps
Answer:
Explanation:
Let the distance be d . When sound travels d and is reflected back , it is heard by person as echo . Time taken by sound to travel total of distance 2 d
= 2 d / v where v is velocity of sound.
When this time is .05 s at least , echo will be heard . velocity of sound in air 340 m /s
so for echo to be heard ,
2 d / 340 = .05
d = 340 x .05 / 2
= 8.5 m .
Answer: Work that the motor of the crane do is 61122 joules.
Explanation:
Work is defined as the force resulting into displacement of an object.
w = work done
m= mass of object = 334 kg
g = acceleration due to gravity =
h = height of an object = 18.3 m
Putting in the values:
Thus work that the motor of the crane do is 61122 joules
The correct answer is a:Seawater
The answer is B. Just had it on usatestprep