Answer:
140 Hz
Explanation:
Frequency is the reciprocal of period hence f=1/T
Here, the frequency is 140 times per second hence the period will be 1/140= 0.0071428571428 s
Rounded off to 3 significant figures then the period is 0.00714 s or 0.714 ms
Otherwise, the frequency is already given as 140 cycles per second which is equivalent to 140 Hz
Answer:
correct answer is option A (Yes, becuase acceleration depends on the rate of change of velocity and not the value of velocity itself.)
Explanation:
we know that from first equation of motion,
v=u+at
0r
............(1)
here,
v-final velocity
u-initial velocity
a-acceleration
t-time
if a body is not moving it means if its initial velocity is zero (u=0) and if after time t it moves with velocity v then its acceleration will be given as
...........(2)
From above equation it is clear that if an object is not moving, it can be accelerating because acceleration depends on rate of change of velocity and not the value of velocity itself.
"Maritime" air . . . . . always high relative humidity
"Polar" air . . . . . always cold
"Maritime polar" air . . . . . choice-A
Answer:
.a = 849.05 m / s²
Explanation
The centripetal acceleration is
a = v² / r
Linear and angular velocity are related
v = w r
Angular velocity and frequency are related by
w = 2π f
Let's replace
a = w² r
a = 4π² f² r
Let's reduce to the SI system
f = 2.30 rev / s (2π rad / 1 rev) = 14.45 rad / s
.r = 10.3 cm = 0.103 m
Let's calculate
a = 4π² 14.45² 0.103
.a = 849.05 m / s²
