1. Do you think that hand signals are important in officiating games? why?
1 answer:
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Speed=distance/time
distance =48km
time=2 hours
speed=48/2
=24km/h
speed=24km/h
FORMULAS
speed = distance/time
time = distance/speed
distance = speed×time
distance =48km
time=2 hours
speed=48/2
=24km/h
speed=24km/h
FORMULAS
speed = distance/time
time = distance/speed
distance = speed×time
Answer:
570 N
Explanation:
Draw a free body diagram on the rider. There are three forces: tension force 15° below the horizontal, drag force 30° above the horizontal, and weight downwards.
The rider is moving at constant speed, so acceleration is 0.
Sum of the forces in the x direction:
∑F = ma
F cos 30° - T cos 15° = 0
F = T cos 15° / cos 30°
Sum of the forces in the y direction:
∑F = ma
F sin 30° - W - T sin 15° = 0
W = F sin 30° - T sin 15°
Substituting:
W = (T cos 15° / cos 30°) sin 30° - T sin 15°
W = T cos 15° tan 30° - T sin 15°
W = T (cos 15° tan 30° - sin 15°)
Given T = 1900 N:
W = 1900 (cos 15° tan 30° - sin 15°)
W = 570 N
The rider weighs 570 N (which is about the same as 130 lb).
