"Reflection" is the change direction of waves when blocked by obstacle
Answer:
Explanation: Flow rate is how much volume is going through in an one second there for
Flow rate = Velocity × Cross sectional Area
Here cros sectional Area is = π r²
= π × 20²
= 1256 m²
Q = V ×A
8×10³ = V × 1256
V = 6.4 m/s
Answer:
C. Newton's First Law of Motion
Explanation:
As the car comes to an abrupt stop, the body is still moving forward, and is moved back by the seatbelt, an outside force. If not for the seatbelt, the body would continue forward until acted on by the car itself, or thrown out of the car.
Answer:
306.12N/m^2
Explanation:
Mass = 30 kg
g = 9.8m/s2
F = mg
F = 30 x 9.8
F = 294N
L = 0.98m
Since the stilts is square, then the area is L^2
A = L^2
A = 0.98^2
A = 0.9604m^2
P =?
P = F/A
P = 294/0.9604
P = 306.12N/m^2
The pressure exerted by the man is 306.12N/m^2