Answer:
The value of new value of angular speed of merry go round. = 0.96
Explanation:
Given data
r = 1.4 m
Moment of inertia = 265 kg -
11 RPM
= 1.15
From conservation of momentum principal
------- (1)
Put all the values in equation (1)
265 × 1.15 = 317.92 ×
= 0.96
This is the value of new value of angular speed of merry go round.
Answer:
option A
Explanation:
given,
distance between two masses is doubled
new distance, r' = 3 r
using gravitational force equation
............(1)
new gravitational force
now from the given condition
now, from equation (1)
now, the change in gravitational force factor is equal to
Hence, the correct answer is option A
The work done by the force is 47.1 J
Explanation:
The work done by a force in moving an object is given by
(1)
where
F is the magnitude of the force
d is the distance covered by the object
is the angle between the direction of the force and the motion of the object
In this problem, the force applied to the object is
F = 3.0 N
This force is always tangential to the track: this means that at every instant, the force is parallel to the motion of the object, so
And the distance covered is equal to the circumference of the circle, which is:
where r = 2.5 m is the radius.
Now we can substitute into eq.(1) to find the work done:
Learn more about work:
#LearnwithBrainly