D) because the refrigerator was much heavier than the other objects
Answer:
The initial speed of the ball is 3.93 m/s.
Explanation:
It is given that,
A ball is thrown horizontally from a height of 19 m, h = 19 m
Let u is the initial speed of the ball so, its final velocity, v = 5u
Using third equation of motion as :
u = 3.93 m/s
So, the initial speed of the ball is 3.93 m/s. Hence, this is the required solution.
The answer is C.
they run east to west which makes them parallel to the equator and they measure distances north and south.
I hope this helps.
Answer:
a)
<u>get mass of planet:</u>
ρ = M / V
V = 4/3 * R_1^3
M = ρ * V
M = ρ * 4/3 * R_1^3
<u>equate force equations:</u>
F = (GMm) / r^2 // r = R_2
F = ma
a = v^2/R_2
F = m * (v^2/R_2)
m * (v^2/R_2) = (GMm) / R_2^2
<u>plug in and solve v^2:</u>
m * (v^2/R_2) = (G * (ρ * 4/3 * R_1^3) *m) / R_2^2
v^2 = (G * ρ * (4/3) * π * R_1^3) / R_2
<u>put into kinetic energy equation:</u>
K = 1/2 * m * v^2
K = 1/2 * m * (G * ρ * (4/3) * π * R_1^3) / R_2
B)
<u>givens:</u>
U = -(GmM) / R_2
<u>plug in mass of planet:</u>
U = -(G * m * ρ * 4/3 * R_1^3) / R_2
C)
<u>use previous equations and do some algebra:</u>
K/U = (1/2 * m * (G * ρ * (4/3) * π * R_1^3) / R_2) * -(R_2 / (G * m * ρ * 4/3 * R_1^3))
K/U = -1/2
Your answer would be B.
<span>votre réponse serait B</span>