Given the speeds of each runner below, determine who runs the fastest.

emily runs 15 feet per second.
jake runs 109 feet in 8 seconds.
stephanie runs 1 mile in 467 seconds.
tony runs 760 feet in 1 minute.

a. emily
b. jake
c. stephanie
d. tony

option A

Explanation:

we will converts all the velocity into SI unit then we can tell who is running fast.

a) Emily runs at 15 ft/s

1 ft/s = 0.3048 m/s

15 ft/s = 4.572 m/s

b) Jack runs at 109 ft in 8 s

1 ft = 0.3048 m

109 ft = 33.22 m

speed = 33.22/8 = 4.152 m/s

c) Stephanie runs 1 mile in 467 seconds

   1 mile = 1609.34 m

  speed = 1609.34/467

      v = 3.45 m/s

d) Tony runs 760 feet in 1 minute.

1 ft = 0.3048 m

760 ft = 231.65 m

speed = 231.65/60 = 3.86 m/s

from the above solution Emily runs fastest.

the correct answer is option A

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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