Answer:
D
Explanation:
From the information given:
The angular speed for the block 
Disk radius (r) = 0.2 m
The block Initial velocity is:
Change in the block's angular speed is:
However, on the disk, moment of inertIa is:
The time t = 10s
∴
Frictional torques by the wall on the disk is:
Finally, the frictional force is calculated as:
Answer:
5 m/s²
Explanation:
Acceleration = change in speed/time taken
20-5=15
15/3= 5 m/s²
The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases. As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder.
The maximum height reached by the ball thrown by the boy is determined as 12.5 m.
<h3>
Angle of the projection</h3>
The angle of projection of the ball is calculated as follows;
R = u²sin2θ/g
- at maximum range, θ = 45 degrees
50 = u²/9.8
u² = 50 x 9.8
u² = 490
u = 22.14 m/s
<h3>Maximum height of the ball</h3>
H = u²sin²θ/2g
H = (22.14² x (sin45)²)/(2 x 9.8)
H = 12.5 m
Thus, the maximum height reached by the ball thrown by the boy is determined as 12.5 m.
Learn more about maximum height here: brainly.com/question/12446886
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Answer:
Non-zero
Explanation:
For a simple harmonic motion, the restoring force is given by
F = -kx (1)
where
k is the spring constant
x is the displacement of the system with respect to the equilibrium position
According to Newton's second law, the acceleration of the system is given by
a = F/m (2)
where
m is the mass of the system
So if we substitute (1) into (2) we find
a = -kx/m
so the acceleration is directly proportional to the displacement. Since the value of the displacement in a simple harmonic motion constantly changes, the acceleration changes as well, so it is non-zero (apart from the instant where the displacement is zero, x = 0, when the acceleration is also zero)
