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b. 48.91 s
c. 48.910 s
d. 48.9 s
Answer:
Least precise recorded time is 48.9 seconds.
Explanation:
Here, we need to write the recorded time that is least precise. The given options are (a) 48.9107 s (b) 48.91 s (c) 48.910 s (d) 48.9 s. The precision in any measurement is defined as closeness in any measurement.
First option is most precise as it is precised to four decimal places. Second option is precised to two decimal places. Third option is precised to 3 decimal places. But in option fourth, the recorded time is precised to one decimal place.
Hence, the correct option is (d).
B. It will decrease her terminal velocity.
C. It will reduce her terminal velocity to zero.
D. It will change the direction of her terminal velocity.
A parachute decreases the terminal velocity of a skydiver by increasing air resistance.
A parachute decreases the terminal velocity of a skydiver.
Terminal velocity is the maximum velocity an object can reach while falling through a fluid, such as air. When a skydiver jumps out of a plane, initially they accelerate due to the force of gravity. As they gain speed, the air resistance or drag force acting against them increases. Eventually, the drag force becomes equal in magnitude to the force of gravity, causing the skydiver to reach a constant velocity - the terminal velocity.
When a parachute is deployed, it increases the surface area that is exposed to air resistance. This creates a larger drag force, which slows down the motion of the skydiver. As a result, the skydiver's terminal velocity decreases, allowing them to descend more slowly and safely to the ground.
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