Answer:
160J
Explanation:
Given force = 8N and total distance = 20 meters 
Workdone = force x distance 
 = 8 x 20 
 = 160J
Therefore, workdone by Riley in pulling the hoover is 160J 
 
        
             
        
        
        
The answer is D. Electric resistance increases with an increase in the length of a wire and as a result current flow decreases. There is a direct relationship between the length of the wire and the resistance. The longer the wire, the more resistance there will be. Additionally, from Ohm's Law, current is inversely proportional to resistance. This means as the current increases, resistance decreases or vice versa.
        
             
        
        
        
The longitude based on the time difference is 15 degrees.
<h3>Longitude of complete rotation of the Earth</h3>
The longitude of a complete rotation of the earth in a 24 hours is calculated  as follows;

<h3>Time difference</h3>
The time difference between the local apparent solar time and the Greenwich time is calculated as follows;

Since it is one hour time difference, the longitude is 15 degrees.
Learn more about Earth longitude here: brainly.com/question/1939015
 
        
             
        
        
        
Answer: 
hypernova making a black hole, and merger of two neutron stars
 
        
             
        
        
        
Answer with Explanation:
We are given that 
Distance,r=0.27 m
Tangential speed=v=0.49 m/s
a.Angular speed ,
Using the formula 



Time period,
b.Amplitude,A=Distance of small eraser from the center of a turnable =0.27 m
c.Maximum speed,
d.Maximum acceleration=