Salmon often jump waterfalls to reach their breeding grounds. starting downstream, 1.84 m away from a waterfall 0.251 m in height, at what minimum speed must a salmon jumping at an angle of 38.3 ◦ leave the water to continue upstream? the acceleration due to gravity is 9.81 m/s 2 .

4.73 m/s

Explanation:

R=1.84  m

H=0.251 m

∅=38.3°

For Horizontal Motion

aₓ=0      uₓ=ucos∅

x=uₓt+

R=ucos∅*t+0

1.84=ucos(38.3)*t

t=

For Vertical Motion

Y=Uy*t+

By putting value

0.251=usin∅()-()

0.251=sin(38.3)()-()

0.251=1.452-

u²=22.41

u=4.73 m/s

f=ma newton's second law 7x8=56n

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.