Answer:
8) 1500 feet
9) 20 miles
10) 4 Days
11) 2250 miles
12) 1 hour and 5 minutes
13) 27.27miles per hour 
Explanation
8) There are 60 seconds in one minute so 60x25=1500 feet
9) 30 minutes is half of an hour so 40 miles ÷ 2 = 20 miles
10) 12x4=48
11) 500 miles x 4.5 hours is 2250 miles
12) Train leaves at 3pm after 60 miles it will be 4 pm and after 5 more miles 4:05 pm so 1 hour and 5 minutes
13) 
Elmo = 40 minutes and 5 miles
Bert and Ernie = 45 minutes and 15 miles 
Cookie Monster = 20 minutes and 10 miles
Home = 5 minutes abd 20 miles 
Average Speed including stops is 27.27 miles per hour 
 
        
             
        
        
        
Answer:

Explanation:
 = Intensity of unpolarized light =
 = Intensity of unpolarized light = 
 = Angle of the filter =
 = Angle of the filter = 
Intensity of light is given by

The intensity of light detected by the camera is 
 
        
             
        
        
        
Answer:
v = 10 m/s
Explanation:
Given that,
Distance covered by a sprinter, d = 100 m
Time taken by him to reach the finish line, t = 10 s
We need to find his average velocity. We know that velocity is equal to the distance covered divided by time taken. So,
v = d/t

Hence, his average velocity is 10 m/s.