Which one of the following SI base units is not matched to the correct unit of measurement?
2 answers:
Answer:
C. Length: km
Explanation:
Let's analyze each option:
A. Mass: in the SI system, mass is measured in kilograms (kg), so this matching is correct.
B. Time: in the SI system, time is measured in seconds (s), so this matching is correct.
C. Length: in the SI system, length is measured in meters (m). The kilometer, instead, is a multiple of the meter (). Therefore, this matching is not correct.
D. Temperature: in the SI system, temperature is measured in Kelving (K), so this matching is correct.
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Refer to the diagram shown below.
u = 20 m/s, the horiontal launch velocity
v = 0, initial vertical velocity
Assume that wind resistance may be ignored.
The time, t, of the flight is given by
(1/2)*(9.8 m/s²)*t² = (100 m)
t² = 100/4.9 = 20.4082
t = 4.5175 s
Th horizontal distance traveled is
d = (20 m/s)*(4.5175 s) = 90.35 m
Answer: B
The projectile hits the ground at approximately 90 m from the base of the cliff.
u = 20 m/s, the horiontal launch velocity
v = 0, initial vertical velocity
Assume that wind resistance may be ignored.
The time, t, of the flight is given by
(1/2)*(9.8 m/s²)*t² = (100 m)
t² = 100/4.9 = 20.4082
t = 4.5175 s
Th horizontal distance traveled is
d = (20 m/s)*(4.5175 s) = 90.35 m
Answer: B
The projectile hits the ground at approximately 90 m from the base of the cliff.