It’s D. The pitch would be lower. I’m 100% sure. I just took the test. I hope this helps you!! <3
Answer:
Explanation:
The explanation and answer to this is posted in your question #24236118
Answer:
A) R = F1 + F2
B) R = | F1 - F2 |
Explanation:
A) For forces acting in the same direction
we will add up the forces : lets assume the forces to be F1 , F2
Then the magnitude of the forces acting in the same direction will be
R = F1 + F2
B) For forces acting in the opposite direction
we will subtract the forces i.e. stronger force - weaker force . assuming the forces to be F1 , F2
Hence the magnitude of the resultant force = R = | F1 - F2 |
Answer:
9.9 s
Explanation:
mass (m) = 1000 kg
initial speed (u) = 90 km/h
final speed (v) = 45 km/h
relationship between the speed (v) of the boat and the frictional force (fk) ⇒ fk = 70v
- the acceleration of the system will be given by (a) =
- acceleration is also the first differential of velocity with respect to time,
a =
- therefore acceleration (a) = =
- recall that fk = 70v
(a) = = =
(a) = =
- integrating both side of the equatin we have
t =
- the time required for the boat to slow down = t = = - 9.9 s = 9.9 s
I think that numbers one, three, and four are true