(II) The pilot of an airplane traveling 170km/h wants to drop supplies to flood victims isolated on a patch of land 150m below. The supplies should he dropped how many seconds before the plane is directly overhead? Choose downward to be the positive y direction. The origin is the point where the supplies are dropped. In the vertical direction. v y 0 = 0. a y = 9.80 m/s 2 , y 0 = 0, and the final position is y = 150 m. The time of flight is found from applying Eq. 2-12b to the vertical motion. y = y 0 + v y 0 t + 1 2 a y t 2 → 160 m = 0 + 0 + 1 2 ( 9.80 m/s 2 ) t 2 → t = 2 ( 150 m ) 9.80 m/s 2 = 5.5 s Note that the horizontal speed of the airplane does not enter into this calculation.
(II) The pilot of an airplane traveling 170km/h wants to drop supplies to flood victims isolated on a patch of land 150m below. The supplies should he dropped how many seconds before the plane is directly overhead? Choose downward to be the positive y direction. The origin is the point where the supplies are dropped. In the vertical direction. v y 0 = 0. a y = 9.80 m/s 2 , y 0 = 0, and the final position is y = 150 m. The time of flight is found from applying Eq. 2-12b to the vertical motion. y = y 0 + v y 0 t + 1 2 a y t 2 → 160 m = 0 + 0 + 1 2 ( 9.80 m/s 2 ) t 2 → t = 2 ( 150 m ) 9.80 m/s 2 = 5.5 s Note that the horizontal speed of the airplane does not enter into this calculation.
(II) The pilot of an airplane traveling 170km/h wants to drop supplies to flood victims isolated on a patch of land 150m below. The supplies should he dropped how many seconds before the plane is directly overhead?
Choose downward to be the positive y direction. The origin is the point where the supplies are dropped. In the vertical direction. vy0 = 0. ay = 9.80 m/s2, y0 = 0, and the final position is y = 150 m. The time of flight is found from applying Eq. 2-12b to the vertical motion.
y
=
y
0
+
v
y
0
t
+
1
2
a
y
t
2
→
160
m
=
0
+
0
+
1
2
(
9.80
m/s
2
)
t
2
→
t
=
2
(
150
m
)
9.80
m/s
2
=
5.5
s
Note that the horizontal speed of the airplane does not enter into this calculation.
Question 2:
#63 In 1780, in what is now referred to as "Brady's Leap," Captain Sam Brady of the U.S. Continental Army escaped certain death from his enemies by running horizontally off the edge of the cliff above Ohio's Cuyahoga River, which is con-fined at that spot to a gorge. He landed safely on the far side of the river. It was reported that he leapt 22 ft across while falling 20 ft. Tall tale, or possible?
A basketball player is standing on the floor 14.0 m away from the basket. The height of the basket is 3.05 m, and heshoots the ball at 49.0° with the horizontal from a height of 2.00 m. At what speed must the player shoot the ball so thatit goes through the hoop without striking the backboard?
One of the fastest recorded pitches in major-league baseball, thrown by Billy Wagner in 2003, was clocked at 101.0 mi/h (45.1 m/s). If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically, in meters, by the time it reached home plate, 60.5 ft. (18.4 m) away?
*Must include BIG six list for both x and y directions*
Chapter 3 Solutions
Physics for Scientists and Engineers, Books a la Carte Edition
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