Natural gas is the answer.
Answer:

Explanation:
Given,
mass = 1.41 g = 0.00141 Kg
Electric field,E = 670 N/C.
We know,
Force in charge due to Electric field.
F = E q
And also we know
F = m g
Equating both the equation of motion
m g = E q

Charge of the particle is equal to 
Answer:
George
Explanation:
George is correct because no matter the mass all objects will hit the ground at once because each has a certain amount of gravity needing them to pull it down for example your weight the bigger the person the heavier.
Answer:
0.0018
Explanation:
Given that,
Mass of a solid, m = 450 kg
Volume, V = 250 cm³ = 0.00025 m³
The density of solid is given by :
Density = mass/volume
So,

The density of water is 1000 kg/cm³.
Relative density = density of solid/density of water
So, the relative density of the solid is 0.0018
.
Answer:
The minimum angle the ladder makes with the horizontal for the ladder not to slip and fall is 45 degrees.
Explanation:
Given that,
Mass of the ladder, m = 75 kg
Length of the ladder, l = 3 m
The center of gravity of the ladder is at a point 1.2 m from the base of the ladder.
The coefficient of static friction at the base of the ladder is 0.4
We need to find the minimum angle the ladder makes with the horizontal for the ladder not to slip and fall.
At equilibrium, net force and net torque on the ladder is equal to zero. Force is given by :
Using condition for torque as :

So, the minimum angle the ladder makes with the horizontal for the ladder not to slip and fall is 45 degrees.