The eaths radius is the correct answer, if you need proof look at nasa's website 
        
                    
             
        
        
        
#8 positive kinetic energy
        
             
        
        
        
When a  woman walks south at a speed of 2.0mph for 60 minutes. She then turns around and walks north at a distance of 3000m in 25 minutes. then the woman's average speed during her entire motion would be  73.15 meters /minute.
<h3>What is speed?</h3>
The total distance covered by any object per unit of time is known as speed.
the mathematical expression for speed is given by
speed = total; distance /total time 
As given in the problem a woman walks south at a speed of 2.0mph for 60 minutes
60 min = 1 hour 
1 mile = 1.60934 km 
The distance covered by her southwards  =  speed ×time 
                                                                       =2 mph × 60 minutes 
                                                                       = 3.218 km 
She then turns around and walks north at a distance of 3000m in 25 minutes
The distance covered northward is 3000m
speed = total distance /total time 
           =(3218 +3000) /(60+25)
           =73.15 meters /minutes 
Thus, The average speed of the woman would be 73.15 meters /minute.
Learn more about speed from here 
brainly.com/question/13263542
#SPJ1
 
        
             
        
        
        
first off lemme just say this is really easy man, just look at the directions 
Blank #1: -23
Blank #2: 23
 
        
             
        
        
        
The density of an object can be calculated using the formula Density = Mass/Volume.
Experimental Density:
Density = 153.8g / 20.00 cm^3
Density = 7.69g/cm^3
Percent error equation:
% Error = | Theoretical Value - Experimental Value|/Theoretical Value * 100
% Error = | 7.87g/cm^3 - 7.69g/cm^3|/7.87g/cm^3 * 100
% Error = 2.29%
Therefore a is the correct answer.