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vehicles are abreast of each other, the police car starts to pursue the automobile at
a constant acceleration of 1.96 m/s². The motorist noticed the police car in his rear
view mirror 12 s after the police car started the pursuit and applied his brakes and decelerates at 3.05 m/s². (Hint: The police will not go against the law.)
a) Find the total time required for the police car to overtake the automobile.
b) Find the total distance travelled by the police car while overtaking the
automobile.
c) Find the speed of the police car at the time it overtakes the automobile.
d) Find the speed of the automobile at the time it was overtaken by the police car.
Answer:
a.) Time = 17.13 seconds
b.) 31.88 m
c.) V = 11.18 m/s
d.) V = 7.1 m/s
Explanation:
The initial velocity U of the automobile is 15.65 m/s.
At the instant that the two vehicles are abreast of each other, the police car starts to pursue the automobile with initial velocity U = 0 at a constant acceleration of 1.96 m/s². Because the police is starting from rest.
For the automobile, let us use first equation of motion
V = U - at.
Acceleration a is negative since it is decelerating with a = 3.05 m/s² . And
V = 0.
Substitute U and a into the formula
0 = 15.65 - 3.05t
15.65 = 3.05t
t = 15.65/3.05
t = 5.13 seconds
But the motorist noticed the police car in his rear view mirror 12 s after the police car started the pursuit and applied his brakes and decelerates at 3.05 m/s².
The total time required for the police car to overtake the automobile will be
12 + 5.13 = 17.13 seconds.
b.) Using the third equation of motion formula for the police car at V = 11.18 m/s and a = 1.96 m/s²
V^2 = U^2 + 2aS
Where S = distance travelled.
Substitute V and a into the formula
11.18^2 = 0 + 2 × 1.96 ×S
124.99 = 3.92S
S = 124.99/3.92
S = 31.88 m
c.) The speed of the police car at the time it overtakes the automobile will be in line with the speed zone which is 11.18 m/s
d.) That will be the final velocity V of the automobile car.
We will use third equation of motion to solve that.
V^2 = U^2 + 2as
V^2 = 15.65^2 - 2 × 3.05 × 31.88
V^2 = 244.9225 - 194.468
V = sqrt( 50.4545)
V = 7.1 m/s
x + 2 * x is the correct option. The above-selected option demonstrates implicit conversion, which is an automated type of conversion. Thus, option B is correct.
The series of conversions are necessary to change the type of a function call's argument to that of the parameter with the same name in the function declaration is known as an implicit conversion sequence. For each parameter, the compiler tries to identify an implicit conversion sequence.
If both user-defined conversion sequences A and B contain the same user-defined conversion function or constructor, and if the second standard conversion sequence of A is superior to the second standard conversion sequence of B, then user-defined conversion sequence A is preferable to user-defined conversion sequence B.
Learn more about implicit conversion here:
#SPJ12
Answer:
Explanation:
Given that
Diameter(d)=62 mm
Thickness(t)= 300 μm=0.3 mm
Internal pressure(P)=100 KPa
Actually there is no any shear stress so normal stress will become principle stress.This is the case of thin cylinder.The stress in thin cylinder are hoop stress and longitudinal stress .
The hoop stress
Longitudinal stress
Now by putting the values
So the principle stress are
Answer:
The truck will not stop in time. The truck passes the stop sign by about 63.41 ft before it stops.
Explanation:
The distance that the truck starts slowing down = 80 ft from the stop sign
Using equations of motion, we can calculate the distance it will take the truck to stop, then check of it is less than or more than 80 ft.
u = initial velocity of the truck = 40 mph = 58.667 ft/s
v = final velocity of the truck = 0 ft/s (since it comes to a stop eventually)
x = horizontal distance covered during the deceleration
a = Deceleration = -12 ft/s² (it'll have a negative sign, since it is negative acceleration
v² = u² + 2ax
0² = 58.667² + 2(-12)(x)
24x = 3441.816889
x = 143.41 ft
143.41 ft > 80 ft; hence, the truck will not stop in time. The truck passes the stop sign by about 63.41 ft before it stops.
A truck traveling at 40 mph is approaching a stop sign. At time t₀ and at a distance of 80 ft, the truck begins to slow down by decelerating at 12 ft/s2, will the truck be able to stop in time?
The truck will not be able to stop in time.
==> First lets convert all variables to SI units
1 mph = 0.45m/s
40mph = 40 miles per hour = 40 x 0.45 m/s
40mph = 18m/s
1 ft = 0.3048m
80 ft = 80 x 0.3048m
80 ft = 24.38m
Also;
12ft/s² = 12 x 0.3048m/s²
12ft/s² = 3.66m/s²
==> Now, consider one of the equations of motion as follows;
v² = u² + 2as -----------------(i)
Where;
v = final velocity of motion
u = initial velocity of motion
a= acceleration/deceleration of motion
s = distance covered during motion
Using this equation, lets calculate the distance, s, covered during the acceleration;
We know that;
v = 0 [since the truck comes to a stop]
u = 40mph = 18m/s
a = -12ft/s² = -3.66m/s² [the negative sign shows that the truck decelerates]
Substitute these values into equation (i) as follows;
0² = 18² + 2 (-3.66)s
0 = 324 - 7.32s
7.32s = 324
s =
s = 44.26m
The distance from where the truck starts decelerating to where it eventually stops is 44.26m which is past the stop sign (which is at 80ft = 24.38m). This means that the truck stops, 44.26m - 24.38m = 19.88m, after the stop sign. Therefore, the truck will not be able to stop in time.
Answer:
a) The velocity is 42.0833 ft/s
b) The flow rate is 3366.664 ft³/s
c) The Froude number is 0.2345
d) The flow energy dissipated (expressed as percentage of the energy prior to the jump) is 18.225 ft
e) The critical depth is 3.8030 ft
Explanation:
Given data:
80 ft wide channel, L
1 ft and 10 ft water depths, d₁ and d₂
Questions: a) Velocity of the faster moving flow, v = ?
b) The flow rate (discharge), q = ?
c) The Froude number, F = ?
d) The flow energy dissipated, E = ?
e) The critical depth, dc = ?
a) For the velocity:
Solving for F:
F = 7.4162
Here, g = gravity = 32.2 ft/s²
b) The flow rate:
c) The Froude number:
d) The flow energy dissipated:
e) The critical depth:
The timber company will lose business soon because not many people will need to build houses and buildings anymore.
The timber company will run out of trees quickly because the seedlings will not have enough time to become full-grown timber.
The timber company will go out of business due to the rising number of buildings using cement and concrete rather than timber.
The timber company will continue to grow because of its good business practices, and it will become the number one timber company in the country.
Answer: The timber company will run out of trees quickly because the seedlings will not have enough time to become full-grown timber
Explanation: I got it right on Edge!!!! Hope this helps