21+10=31 because you can see that 21 and 10 are in metres while 12 is in seconds so 21+10=31 is the answer.
Answer:
D = 30.625 m
Explanation:
given,
Speed of the climber = 1.3 m/s
time = 2.5 s
acceleration due to gravity = 9.8 m/s²
initial speed of the kit = 1.3 m/s
velocity of the kit after 2.5 s
using equation of motion
v = u + a t
v = 1.3 + 9.8 x 2.5
v = 25.8 m/s
distance travel by the kit in 2.5 s
v² = u² + 2 g h
25.8² = 1.3² + 2 x 9.8 x h
19.6 h = 663.95
h = 33.875 m
distance travel by the rock climber in 2.5 s
distance = speed of climber x time
h' = 1.3 x 2.5
h' = 3.25 m
Distance between kit and rock climber
D = h - h'
D = 33.875 - 3.25
D = 30.625 m
The kit is 30.625 m below climber.
Answer:
the answer is 375°F
Explanation:
you simply subtract 250°F from 625°F
The "coefficient of absorption" of a soundproofing material is
the fraction of sound energy that goes into the material, gets
absorbed, doesn't come out, and is never heard again.
So, sample C would be the best choice, because the percentage
of the energy in an incident wave that gets absorbed in this material
is the greatest, and the percentage of the energy that remains in a
reflected wave from this material is the smallest. (Choice-B)