Answer:
The other angle is 75⁰
Explanation:
Given;
velocity of the projectile, v = 10 m/s
range of the projectile, R = 5.1 m
angle of projection, 15⁰
The range of a projectile is given as;

To find another angle of projection to give the same range;

<u>Check: </u>
sin(2θ) = sin(2 x 75) = sin(150) = 0.5
sin(2θ) = sin(2 x 15) = sin(30) = 0.5
 
        
             
        
        
        
Answer:
is that high school work??? cause I don't know it and I'm about to go to high school
 
        
             
        
        
        
1) In a circular motion, the angular displacement 

 is given by

where S is the arc length and r is the radius. The problem says that the truck drove for 2600 m, so this corresponds to the total arc length covered by the tire: 

. Using the information about the radius, 

, we find the total angular displacement:

2) If we put larger tires, with radius 

, the angular displacement will be smaller. We can see this by using the same formula. In fact, this time we have:
 
 
        
        
        
Answer:
Failure rate   = 20%
MTBF = 880 hours
Explanation:
given data 
batteries = 10 
tested = 200 hours
one failed = 20 hours
another fail at =  140 hours
solution
we know that Mean Time between Failures is express as = (Total up time) ÷  (number of breakdowns)    ....................1
so here Total up time will be 
Total up time = 200 × 10 
Total up time = 2000
and here 
Number of breakdown = 1 at 20 hour and another at 140 hour = 2
so it will be  = (Total up time) ÷ (number of breakdowns)      .......2
=   =  1000
   =  1000  
so here gap between occurrences is
gap between occurrences=  140 - 20 
gap between occurrences = 120 hour
and 
MTBF  will be 
MTBF = 1000 - 120
MTBF = 880 hours   
and 
Failure rate (FR)  will be 
Failure rate (FR) =  1 ÷ MTBF    ................3
Failure rate (FR) = R÷T     ......................4
as here R is the number of failures and T is total time 
so Failure rate (FR)  = 20%