The formula for the acceleration due to gravity is:
a = Gm/r²
where
G is the universal gravitational constant = 6.6726 x 10⁻¹¹ N-m²/kg²
m is the mass of planet
r is the radius of planet
So, if they have the same a:
m₁/r₁² = m₂/r₂²
So, if m₁ = m and r₂ = 2r₁,
m/r₁² = m₂/(2r₁)²
m₂ = 4m
<em>Thus, the answer is D.</em>
It would travel faster through a steel bar, because sound waves travel by vibrating molecules in a medium. In solids, these molecules are spaced closer together, causing sound to travel faster through it. so that means the second fastest medium is liquid and the slowest is gas
Answer:
11.2°
Explanation:
Using the trigonometry ratio,
Note: Assuming the ladder, the wall and the horizontal forms a right angle triangle.
Cosθ = Opposite/Hypotenuse
SinΦ = O/H.......................... Equation 1
Where Φ = angle between the ladder and the wall, O = opposite, H =Hypotenuse.
make Ф the subject of the equation,
Ф = sin⁻¹(O/H).................. Equation 2
Given: O = 3.3 foot, H = 17 foot
Ф = sin⁻¹(3.3/17)
Ф = sin⁻¹(0.194/
Ф = 11.19°.
Ф = 11.2° ( to the nearest tenth degree)
Hence the ladder and the wall makes an angle of 11.2°
