Answer:
Maximum height of the ball, h(t) = 27.56 m
Explanation:
It is given that, a ball is shot from the ground straight up into the air with initial velocity of 42 ft/sec.
The height of the ball as a function of time t is given by :

h₀ is initial height, h₀ = 0
So,
.........(1)
For maximum/minimum height, 
...(2)
t = 1.31 s
Differentiating equation (2) wrt t
h''(t) = -32 < 0
So, at t = 1.31 seconds we will get the maximum height.
Put the value of t in equation (1)

h(t) = 27.56 m
Hence, this is the required solution.
Answer:
(a) Angular momentum of disk is 
(b) Angular velocity of the disk is 
Explanation:
Given
Rotational inertia of the disk , 
Torque delivered by the motor , 
Torque is applied for duration , 
(a)
Magnitude of angular momentum of the disk = Angular impulse produced by the torque

=>
Thus angular momentum of disk is 
(b)
Since Angular momentum , 
where
= Angular velocity of the disk


Thus angular velocity of the disk is 
Answer:
B
Explanation:
The correct answer is B: in the northwest.
Answer:
Explanation:
Given
Velocity of Passenger w.r.t to Ferry
-------1
Velocity of Passenger w.r.t to water
--------2
Subtract 2 from 1

(b)direction

North of west
Answer:
The wavelength decreases as the electron speeds up. The wavelength increases as the electron slows down.
Explanation: