Answer:
In first case angular displacement will be 11.55 radian
In second case it will be 4 times the previous case
Explanation:
We have given that machine rotates at an angular velocity of 0.07 rad/sec
So initial angular velocity 
And its speed is increases to 3.4 rad/sec
So final angular velocity is 
Angular acceleration 
According to third equation of motion we know that
Now initial angular velocity and final angular velocity both are doubled but angular acceleration is constant
So 
And 
So 
So angular displacement will be 4 times the earlier displacement
The correct answer would be A.The acceleration of gravity is <span>9.81 m/s^2. This is calculated by using the equation:
a = GM/r</span>²
where G is the gravitational constant 6.6726 x 10-11N-m2/kg2, M is the mass of the planet (<span>5.9736E+24 kg) and r is the radius of the planet.
</span>
Explanation:
If the forces are not balanced on an object, the object experiences an overall net force. This will change the object's velocity.
All vehicles are required to stop within 15 FEET of the railroad crossing when a train is approaching.
Answer:
Parachute exerts a force of 619.2 N upward
The net force is 86.4 N acting downward
Explanation:
As the gravitational acceleration g = 9.8 m/s2, the parachute help reduces the net acceleration to 1.2m/s. So it must exerted an upward acceleration on the skydiver of
9.8 - 1.2 = 8.6 m/s2
Since the skydiver mass is 72 kg, we can use Newton's 2nd law to calculate the force that causes this acceleration of 8.6
F = ma = 8.6*72 = 619.2 N acting upward
The net force is also the product of net acceleration and mass
= 1.2 * 72 = 86.4 N acting downward
