Answer:
Decreases the time period of revolution
Explanation:
The time period of Cygnus X-1 orbiting a massive star is 5.6 days.
The orbital velocity of a planet is given by the formula,
                                         v = √[GM/(R + h)]
In the case of rotational motion, v = (R +h)ω
                                          ω = √[GM/(R + h)] /(R +h)
 Where 'ω' is the angular velocity of the planet
The time period of rotational motion is,
                                      T = 2π/ω
By substitution,
                                       <em>T = 2π(R +h)√[(R + h)/GM] </em>
Hence, from the above equation, if the mass of the star is greater, the gravitational force between them is greater. This would reduce the time period of revolution of the planet.
 
        
             
        
        
        
I think i used calulater and it gives me 47.5
        
             
        
        
        
Answer:
KE =  m
 m
Explanation:
In the generation of energy from hydroelectric power station, the motion of water, and the turbines are paramount. The falling flowing water turns the blades of the turbine, which in-turn causes the movement of a coil within a strong magnetic field.
The motion of the coil which cuts the strong magnetic field induces current. Thus, the system generates electrical energy.
The equation that links kinetic energy (KE), mass (m) and speed (v) can be expressed as:
KE =  m
 m
 
        
             
        
        
        
        
Answer:
the answer is B 
Explanation:
The atomic mass of an atom is the sum of the protons plus neutrons it has.