A stationary source S generates circular outgoing waves on a lake. The wave speed is 5.0 m/s and the crest-to-crest distance is
2.0 m. A person in a motorboat heads directly toward S at 3.0 m/s. To this person, the frequency of these waves is:
1 answer:
Answer:4 Hz
Explanation:
Speed of wave 
crest to crest distance 
velocity of observer 
actual frequency 

Apparent frequency 

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your answer should be “How does the number of radioactive atoms change over time?”
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Friction !!!
Explanation:
Answer:
0.000225 m
Explanation:
Coefficient of linear expansion = 
Length = 0.3 meters
ΔT = Change in temperature = 250 °C
Linear expansion

Change in length of the Pyrex glass dish is 0.000225 m.
Answer: 5 amps
Explanation: I = Q/t
Answer:
a. 150 g/L
b. 75 g
c. 120 mL
Explanation:
a. 33g/0.22L=150 g/L
b. 33g/0.22L=150 g/L
150 g/L*0.5L=75g
c. 0.22L/33g=0.006667L/g
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0.12L*1000=120mL