1. From the point of view of an observer on the ground, the angle of elevation to a hot-air balloon 430 feet in the air is 20.4 degrees. How far is the observer from a point directly below the balloon?
2. A heavy piece of machinery is raised by sliding it 16.2 m along a plank oriented at 10.5° to the horizontal, as shown in Fig. 3-29 (substituting your numbers for those given in the figure).
How high above its original position is it raised
How far is it moved horizontally?
3. As shown in the accompanying diagram, a kite is flying at the end of a 25 meter string. If the string makes an angle of 65° with the ground, how high, to the nearest meter, is the kite?
4. If 0.00365 is written in scientific notation as 3.65 10n, find the value of n.
2007-12-05 11:00:01 · 1 answers · asked by Pieces Of Rainbowzz 4 in Science & Mathematics ➔ Physics
These are math problems.
1. "How far is the observer" that's along the hypotenuse.
Sin20.4 = opposite / hypotenuse
2. Considering the 10.5 degree andle
16.2 m along the plank is along the hypotenuse
How high is the opposite side
How far horizontally is the adjacent side
3. The string is the hypotenuse
how high is the adjacent side
4. To convert 0.00365, count the number of places you move the decimal to get it between the 3 & 6. That's making it bigger. Compensate by making the exponent on 10 smaller by that many times.
0.00365 = 3.65*10^-3
You need to learn to use the ^. Hold Shift and hit 6.
2007-12-05 12:47:11 · answer #1 · answered by sojsail 7 · 0⤊ 0⤋