Answer:
Explanation:
a ) 
momentum of baseball before collision 
 mass x velocity
= .145 x 30.5
= 4.4225 kg m /s 
momentum of brick after collision 
= 5.75 x 1.1 
= 6.325 kg m/s 
Applying conservation of momentum
4.4225 + 0 = .145 x v + 6.325 , v is velocity of baseball after collision.
v = - 13.12 m / s 
b ) 
kinetic energy of baseball  before collision = 1/2 mv²
= .5 x .145 x 30.5²
= 67.44 J 
Total kinetic energy before collision = 67.44 J 
c )
kinetic energy of baseball after collision = 1/2 x .145 x 13.12²
= 12.48 J .
  kinetic energy of brick after collision
= .5 x 5.75 x 1.1²
= 3.48 J 
Total kinetic energy after collision 
= 15.96 J 
 
        
             
        
        
        
Answer:
M V = m v        conservation of momentum (Caps-cannon  Small-projectile)
V = m / M * V = 2 / 2000 * 200 m/s = .2 m/s    recoil velocity of cannon
KE = 1/2 M V^2 = 2000 / 2 kg * (.2 m/s)^2  = 40 kg m^2/s^2 = 40 J
 
        
                    
             
        
        
        
Answer:
1838216 J
Explanation:
95 km/h = 26.39 m/s
40 km/h = 11.11 m/s 
Initial kinetic energy 
= .5 x 1600 x(26.39)²
= 557145.67 J 
Final kinetic energy 
= .5 x 1600 x ( 11.11)²
= 98745.68 J 
Loss of kinetic energy 
= 458400 J 
Loss of potential energy 
= mg x loss of height 
= 1600 x 9.8 x 340 sin 15 
= 1379816 J 
Sum of Loss of potential energy and Loss of kinetic energy 
=  1379816 + 458400
= 1838216 J 
This is the work done by the friction . So this is heat generated. 
 
        
             
        
        
        
Answer: 1.176×10^-3 s
Explanation: The time constant formulae for an RC circuit is given below as 
t =RC
Where t = time constant , R = magnitude of resistance = 21 ohms , C = capacitance of capacitor = 56 uf = 56×10^-6 F
 t = 56×10^-6 × 21
t = 1176×10^-6
t = 1.176×10^-3 s