Answer:
Actually, surface tension is the to force per unit length. That means formula for surface tension is = force/length . As we know that the dimensional formula for length is L . And that for force is MLT^-2. So the dimensional formula for surface tension can be obtained by dividing the dimensional formula of force and length.
Explanation:
Answer:
Half life of the sample, 
Given:
Initial amount, N = 1679
Final count of amount, N' = 1336
Time elapsed, t = 4 min = 240 s
Solution:
Now, To calculate the half life, using the relation:
Now, substituting the given values in the above mentioned formula:
Taking log on both the sides:
ln(0.796) = \frac{4}{t_{\frac{1}{2}}}ln(0.5)
The correct answer is b changing tides
Answer: 2.72 m/s²
Explanation:
F = m(g + a)
188 = 15.0(9.81 + a)
188 = 147.15 + 15.0a
40.85 = 15.0a
a = 2.7233333... ≈ 2.72 m/s²
This is an upward acceleration as the force being applied is greater than that needed to maintain constant velocity. (147 N)
So even though the bucket is being lowered, it's rate of descent is decreasing with time. If the acceleration continues for long enough, the bucket will begin to rise.
Answer:
About 250 Hz
Explanation:
People of All ages without a hearing impairment should be able to hear the 8000hz. People under 50 should be able to hear the 12,000hz and people under 40, the 15,000hz. Under 30s should hear the 16,000hz, and the 17,000hz is receivable for those under 24.
