Answer:
T = 13.3 N
Explanation:
In this exercise we use Newton's second law, in the lower birth of the circle the tension and force are opposite, so the tension has its maximum value
T - W = m a
The acceleration is centripetal
a = v² / r = w² r
We replace
T = mg + m w² r
The angular velocity is related to the period
w = 2π f = 2π / T₀
T₀ = 2.10 s
T = m (g + 4π² r / T₀²)
Let's calculate
T = 1.35 (9.8 + 4π² 1.10 /2.10²)
T = 13.3 N
Sound waves travel through the air to your eardrum
Answer:
0.91 J
Explanation:
The kinetic energy of an object is given by
where
m is the mass of the object
v is its speed
For the lemming in this problem, when he jumps, we have:
m = 0.0780 kg is the mass
v = 4.84 m/s is the speed
Substituting into the equation, we find:
Potable water is Fit to drink. It is both safe and healthy enough for consumer use.
