Answer:
The speed of projection is 34 m/s.
Explanation:
Height of building, h = 51 m
horizontal distance, d = 74 m
time, t = 8 s
Let the angle is A and the speed is u.
d = u cos A x t
74 = u cos A x 8
u cos A = 9.25 .... (1)
Use second equation of motion
Squaring and adding both the equations
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If the observer is moving away from the source ((Figure)), the observed frequency can be found: λs=vTo−voTovTs=(v−vo)Tov(1fs)=(v−vo)(1fo)fo=fs(v−vov).
Answer: Radioactive dating
Explanation: I took the test, and use the other answer, and got it wrong. The test told me that this is the correct one.
Power = VI
⇒ 120 = 6 * I
⇒ I = 120/6 = 20A
Answer is B