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3 years ago

6

A fighter jet lands on the flight deck of an aircraft carrier that has a length of 300.0 m. The jet must reduce its speed from a

bout 153 km/h to exactly 0 km/h in 2.0 s. What is the jet’s acceleration?

1 answer:

Yakvenalex [24]3 years ago

3 0

Answer:

-76.5m/s²

Explanation:

Vf=Vi+at

When equation is rearranged to solve for acceleration

a=(Vf-Vi)/t

a=(0-153)/2

a=-76.5

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2 years ago

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3 years ago

The displacement (in centimeters) of a particle moving back and forth along a straight line is given by the equation of motion s

Veseljchak [2.6K]

Answer:

$v_{avg} = 0$

Explanation:

The object is moving to and fro about its mean position

and the equation for its displacement is given as

$s = 5 sin(\pi t) + 5 cos(\pi t)$

now in one complete time period we know that the the object will complete its one oscillation

So the change in the position of the object in one complete time period will be ZERO

so here we can say that

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3 years ago

Interactive Solution 11.35 presents one method for modeling this problem. Multiple-Concept Example 8 also presents an approach t

shepuryov [24]

Answer:

a) Fi = 85.76 N

b) Fi = 87.8 N

Explanation:

Given:-

- Density of hydraulic oil, ρ = 804 kg/m^3

- The radius of input piston, ri = 0.00861 m

- The radius of output piston, ro = 0.141 m

Find:-

What input force F is needed to support the 23000-N combined weight of a car and the output plunger, when

(a) the bottom surfaces of the piston and plunger are at the same level

(b) the bottom surface of the output plunger is 1.10 m above that of the input plunger?

Solution:-

For part a.

- We see that both plungers are equal levels or there is no pressure due to elevation head. So we are only dealing with static pressure exerted by the hydraulic oil on both plungers to be equal. This part is an application of Pascal's Law:

Pi = Po

Fi / Ai = Fo / Ao

Fi = Ai / Ao * Fo

Fi = (ri/ro)^2 * Fo

Fi = ( 0.00861 / 0.141 )^2 * 23000

Fi = 85.76 N

For part b.

- We see that both plungers are at different levels so there is pressure due to elevation head. So we are only dealing with static pressure exerted by the hydraulic oil on both plungers plus the differential in heads. This part is an application of Bernoulli's Equation:

Pi = Po + ρ*g*h

Where, h = Elevation head = 1.10m

Fi = (ri/ro)^2 * Fo + ρ*g*h*π*ri^2

Fi = 85.76 + (804*9.81*1.1*3.142*0.00861^2)

Fi = 87.8 N

3 0

3 years ago