Answer:
g = 11.2 m/s²
Explanation:
First, we will calculate the time period of the pendulum:

where,
T = Time period = ?
t = time taken = 135 s
n = no. of swings in given time = 98
Therefore,

T = 1.38 s
Now, we utilize the second formula for the time period of the simple pendulum, given as follows:

where,
l = length of pendulum = 54 cm = 0.54 m
g = acceleration due to gravity on the planet = ?
Therefore,

<u>g = 11.2 m/s²</u>
 
        
             
        
        
        
Answer:
The bigger one. Ignoring air resistance, they will fall at the same speed, but the bigger one will hit first because it sticks out lower.
Explanation:
 
        
             
        
        
        
Answer:
 6.4m/s
Explanation:
The total mechanical energy of the man is 1780J. 
This mechanical energy is the energy due to the motion of the body and it is a form of kinetic energy. 
  Also, mass  = 87kg 
    Kinetic energy  =  m v²
   m v²
m is the mass 
v is the velocity 
            1780  =   x 87 x v²
 x 87 x v² 
                 v²  = 40.9
                 v  = 6.4m/s
 
        
             
        
        
        
Answer:
Hydrated iron(III) oxide, or ferric oxide
Explanation: