Answer:
Well I'll say the answer is
A.21
B.21
Explanation:
The law of conservation of momentum states that the total momentum in a system remains constant
And
To find the Total momentum in a body, you'll have to multiply the mass of the body to it's velocity
And
To find the total momentum, you'll add the momenta in every body present in the system
Good precision because he is hitting the same spot 3 times but we don't know if he is accurate. SO the answer is 2
that's cause the roller coaster loses energy to other forces as it does loop-the-loops, curves, and other hills along the way
Runaway greenhouse effect is a process in which a net positive feedback between surface temperature and atmospheric opacity increases the strength of the greenhouse effect on a planet until its oceans boil away. An example of this is believed to have happened in the early history of Venus.
Answer:
x = 22.99 m
Explanation:
This is a projectile launching exercise, let's use trigonometry to find the components of the initial velocity
sin 20 = / v₀
cos 20 = v₀ₓ / v₀
v_{oy} = v₀ sin 20
v₀ₓ = v₀ cos 20
v_{oy} = 12 sin 20
v₀ₓ = 12 cos 20
v_{oy} = 4.1 m / s
v₀ₓ = 11.28 m / s
let's look at the time it takes to reach the ground
y = y₀ + v_{oy} t - ½ g t²
where i is the height of the bridge 12m
0 = 12 + 4.1 t - ½ 9.8 t²
t² - 0.837 t - 2.45 = 0
let's solve the quadratic equation
t = [0.837 ±√ (0.837² +4 2.45)] / 2
t = [0.837 ± 3.24] / 2
t₁ = -1.2 s
t₂ = 2.0385 s
as the time has to be positive the correct result is t = 2.04 s
we use this time to calculate the horizontal distance traveled
x = v₀ₓ t
x = 11.28 2.0385
x = 22.99 m