Answer:
The magnitude of air = 392N
Explanation:
We use Newton's 2nd law. The sum of the vertical forces must be equal to zero because at terminal speed , the acceleration is zero. Solving for the air resistance force,F(air ) gives:
EFvertical = mg - F(air)= ma
F(air) = mg = 40 × 9.8 = 392N
Answer:
s = 1800 m = 1.8 km
Explanation:
The distance, the speed, and the time of reach of the sound are related by the following formula:
where,
s = distance
v = speed
t = time
FOR WATER:
---------------------- eq (1)
where,
s = distance between ship and diver = ?
= speed of sound in water = 1440 m/s
t = time taken by sound in water
FOR AIR:
---------------------- eq (2)
where,
s = distance between ship and diver = ?
= speed of sound in water = 344 m/s
t + 4 s = time taken by sound in water
Comparing eq (1) and eq (2),because distance remains constant:
t = 1.25 s
Now using this value in eq (1):
<u>s = 1800 m = 1.8 km</u>
Energy is related to the change of state represented by the model in this way - C. Atoms lose energy as a gas changes to a solid.
As a certain gas is changing its state into that of a solid material, its atoms are going to lose some energy.
<span>B. This is because P-waves is shorthand for Pressure-waves. Pressure waves compress and stretch along the direction of motion.</span>