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Finger [1]
3 years ago
11

What is the wavelength of an earthquake wave if it has a speed of 13 km/s and a frequency of 12 Hz?

Physics
1 answer:
trasher [3.6K]3 years ago
8 0
V=wavelength×frequency
1. wavelength=13/12 km

speed= 18×8 = 144mm/s
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Without air-resistance, your horizontal speed doesn't change.  It's constant.  Traveling 3.1 m/s for 2.4 sec, you cover (3.1 m/s x 2/4 s) = 7.4 m horizontally.

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7 0
3 years ago
A 20 μF capacitor initially charged to 30 μC is discharged through a 1.5 kΩ resistor. Part A How long does it take to reduce the
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Answer:

it will take 36.12 ms to reduce the capacitor's charge to 10 μC

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Qi= C×V

then:

Vi = Q/C = 30μ/20μ = 1.5 volts

and:

Vf = Q/C = 10μ/20μ = 0.5 volts

then:

v = v₀e^(–t/τ)  

v₀ is the initial voltage on the cap  

v is the voltage after time t  

R is resistance in ohms,  

C is capacitance in farads  

t is time in seconds  

RC = τ = time constant  

τ = 20µ x 1.5k = 30 ms  

v = v₀e^(t/τ)  

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e^(t/30ms) = 10/3  

t/30ms = 1.20397

t = (30ms)(1.20397) = 36.12 ms

Therefore, it will take 36.12 ms to reduce the capacitor's charge to 10 μC.

7 0
3 years ago
In the rocket, what is the equal and opposite reaction?
netineya [11]

Answer:

see below

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