Answer:
v = 2.928 10³ m / s
Explanation:
For this exercise we use Newton's second law where the force is the gravitational pull force
F = ma
a = F / m
Acceleration is
a = dv / dt
a = dv / dr dr / dt
a = dv / dr v
v dv = a dr
We substitute
v dv = a dr
∫ v dv = 1 / m G m M ∫ 1 / r² dr
We integrate
½ v² = G M (-1 / r)
We evaluate from the lower limit v = 0 for r = R m to the upper limit v = v for r = R + 2.73 10³, where R is the radius of Saturn's moon
v² = 2G M (- 1 / R +2.73 10³+ 1 / R)
We calculate
v² = 2 6,674 10⁻¹¹ 1.10 10²¹ (10⁻³ / 5.61 - 10⁻³ /(5.61 + 2.73))
v² = 14.6828 10⁷ (0.1783 -0.1199)
v = √8.5748 10⁶
v = 2.928 10³ m / s
Answer:
<u>1000N</u>
Explanation:
It takes 200N to expand 15cm of one string.
For 5 strings, force required =
200 x 5 = <u>1000N</u>
Answer:
D) Electromagnetic waves
Explanation:
This is because with compression waves and longitudinal waves a medium is required such as air. however in a vacuum this will not work
Answer:
Explanation:
Given
Length of wire is L
Area of cross-section is A
Resistance of wire is given by
where
if wire is cut into two halves of equal length then
New resistance of each piece
if they are connected in parallel then net resistance is given by
Thus Net resistance of new connection is th of the previous one