Answer:
Explanation:
The given time is 1 / 4 of the time period 
So Time period  of oscillation.
= 4 x .4 =1.6 s 
When the block reaches back its original position when it came in contact with the spring for the first time , the block and the spring will have maximum 
velocity. After that spring starts unstretching , reducing its speed , so block loses contact as its velocity is not reduced . 
 So required velocity is the maximum velocity of the block while remaining in contact with the spring.
v ( max ) = w A = 1.32  m /s.
 
        
             
        
        
        
If you divide miles by minutes, the answer will have units of 
miles per minute, which is exactly what you want.
(1 mile) / (10 minutes) = 1/10  mile/minute = 0.1 mile per minute
        
             
        
        
        
Answer:2250J
Explanation:
mass(m)=20kg
velocity(v)=15m/s
Kinetic energy=(m x v^2)/2
Kinetic energy =(20 x 15^2)/2
Kinetic energy =(20x15x15)/2
Kinetic energy=4500/2
Kinetic energy=2250J
 
        
             
        
        
        
Answer:
[1, 6, -2]
Explanation:
Given the following :
Initial Position of spaceship : [3 2 4] km
Velocity of spaceship : [-1 2 - 3] km/hr 
Location of ship after two hours have passed :
Distance moved by spaceship :
Velocity × time 
[-1 2 -3] × 2 = [-2 4 -6]
Location of ship after two hours :
Initial position + distance moved 
[3 2 4] + [-2 4 -6] = [3 + (-2)], [2 + 4], [4 + (-6)]
= [3-2, 2+4, 4-6] = [1, 6, -2]
 
        
             
        
        
        
Answer:
Lenz's law, in electromagnetism, statement that an induced electric current flows in a direction such that the current opposes the change that induced it. This law was deduced in 1834 by the Russian physicist Heinrich Friedrich Emil Lenz (1804–65).