A jet lands at 31.9 m/s, applying the brakes 1.95 s after landing. Find the acce
ID: 2018706 • Letter: A
Question
A jet lands at 31.9 m/s, applying the brakes 1.95 s after landing. Find the acceleration needed to stop the jet within 5.93 102 m.
A typical jetliner lands at a speed of 148 mi/h and decelerates at the rate of (10.2 mi/h)/s. If the jetliner travels at a constant speed of 148 mi/h for 1.2 s after landing before applying the brakes, what is the total displacement of the jetliner between touchdown on the runway and coming to rest?
When applying the equations of kinematics for an object moving in one dimension, which of the following statements must be true?
The acceleration of the object must remain constant.
The position of the object must increase with time.
The velocity of the object must always be in the same direction as its acceleration.
The velocity of the object must remain constant.
The velocity of the object must increase with time.
A juggler throws a bowling pin straight up in the air. After the pin leaves his hand and while it is in the air, which statement is true?
The acceleration of the pin is zero.
The velocity of the pin is never in the same direction as its acceleration.
The velocity of the pin is opposite its acceleration on the way up.
The velocity of the pin is in the same direction as its acceleration on the way up.
The velocity of the pin is always in the same direction as its acceleration.
Explanation / Answer
Vf^2 = Vi^2 + 2ad 0= 31.9^2 + 2(a)(593) a=.858m/s^2 148 mi/h = 66.16192 m / s (0.2 mi/h) / second = 4.559808 m / s^2 d=vt=66.17(1.2)= 79.4m Vf^2 = Vi^2 + 2ad 0=66.17^2 + 2(4.559808 m / s^2)d d=480.1m total=480.1 + 79.4=559.5m The acceleration of the object must remain constant. The velocity of the pin is always in the same direction as its acceleration.
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