Select the correct answer. Brian is repairing an old alarm clock. He needs to replace a device that converts the electric energy
2 answers:
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Answer:
a) T = 2.26 N, b) v = 1.68 m / s
Explanation:
We use Newton's second law
Let's set a reference system where the x-axis is radial and the y-axis is vertical, let's decompose the tension of the string
sin 30 =
cos 30 =
Tₓ = T sin 30
T_y = T cos 30
Y axis
T_y -W = 0
T cos 30 = mg (1)
X axis
Tₓ = m a
they relate it is centripetal
a = v² / r
we substitute
T sin 30 = m (2)
a) we substitute in 1
T =
T =
T = 2.26 N
b) from equation 2
v² =
If we know the length of the string
sin 30 = r / L
r = L sin 30
we substitute
v² =
v² =
For the problem let us take L = 1 m
let's calculate
v =
v = 1.68 m / s
Answer:
The tension is
Explanation:
From the question we are told that
The total mass is
The radius is
The density of air is
Generally the upward force acting on the balloon is mathematically represented as
=>
=>
Here V is the volume of the spherical helium filled balloon which is mathematically represented as
=>
=>
So