TWINKLE_TOES
Veteran Member
- Joined
- Sep 3, 2000
- Messages
- 1,366
Re: More rear work lights
DDT,
I wouldn't bet a plug nickel on this one but, I always thought that Grade was the rate of rise of the road bed i.e the change in vertical rise divided by the change in horizontal run. If this is true then a three foot run and 1 ft rise is ~ 18 1/2 degrees. If grade is defined as rate of rise in distance traveled then 3 ft traveled with a 1 ft rise is just a tad under 20 degrees.
A 5% grade on a higway is a steep grade and no matter which way you define it they are the same to the third decimal point. The sin is equal to the tan within 0.4% for angles less than 5 degrees.
DDT,
I wouldn't bet a plug nickel on this one but, I always thought that Grade was the rate of rise of the road bed i.e the change in vertical rise divided by the change in horizontal run. If this is true then a three foot run and 1 ft rise is ~ 18 1/2 degrees. If grade is defined as rate of rise in distance traveled then 3 ft traveled with a 1 ft rise is just a tad under 20 degrees.
A 5% grade on a higway is a steep grade and no matter which way you define it they are the same to the third decimal point. The sin is equal to the tan within 0.4% for angles less than 5 degrees.