What is one reason that electromagnetic waves are used in long-distance communication?
1 answer:
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Answer:
The bike traveled 31.3 meters during this period
Explanation:
A speed bike tops a hill at 3.50 m/s and accelerates steadily down the
hill until reaching a speed of 11.4 m/s after 4.20 seconds
→ The initial speed u = 3.5 m/s
→ The final speed v = 11.4 m/s
→ The time of acceleration t = 4.2 seconds
→ a =
Substitute the values above in the rule to find the acceleration a
→ a = = 1.88 m/s²
We need to find the distance that the bike traveled during the
acceleration
→ v² = u² + 2 a s, where s is the distance
→ (11.4)² = (3.5)² + 2 (1.88)(s)
→ 129.96 = 12.25 + 3.76 s
Subtract 12.25 from both sides
→ 117.71 = 3.76 s
Divide both sides by 3.76
→ s = 31.3 meters
<em>The bike traveled 31.3 meters during this period</em>
Answer:
(A) 0.1842 T (B) (C) 0.2188 J (D)
Explanation:
Length of the solenoid L = 27 cm =0.27 m
Area of cross section
Number of turns N = 440
Current i = 90 A
(A) Magnetic field in the solenoid
(B) The energy density is given by
(C) The total energy contained in the coli magnetic field = energy density ×volume = energy density ×l×A
So the total energy
(D) The energy stored in the inductor is given by
So