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krok68 [10]
2 years ago
11

To prevent collisions and violations at intersections that have traffic signals, use the _____ to ensure the intersection is cle

ar before you enter it.
Physics
1 answer:
Ann [662]2 years ago
3 0
The answer should be:
<span>To prevent collisions and violations at intersections that have traffic signals, use the d</span>elayed acceleration technique<span> to ensure the intersection is clear before you enter it.
Delayed acceleration technique refers to w</span><span>aiting to go through an intersection until you have a chance to scan for other vehicles.</span>
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7. A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The oncoming water stream has
NNADVOKAT [17]

Answer:

The magnitude of the average force exerted on the water by the blade is 960 N.

Explanation:

Given that,

The mass of water per second that strikes the blade is, \dfrac{m}{t}=30\ kg/s

Initial speed of the oncoming stream, u = 16 m/s

Final speed of the outgoing water stream, v = -16 m/s

We need to find the magnitude of the average force exerted on the water by the blade. It can be calculated using second law of motion as :

F=\dfrac{\Delta P}{\Delta t}

F=\dfrac{m(v-u)}{\Delta t}

F=30\ kg/s\times (-16-16)\ m/s

F = -960 N

So, the magnitude of the average force exerted on the water by the blade is 960 N. Hence, this is the required solution.

6 0
2 years ago
A 57 kg paratrooper falls through the air. How much force is pulling him down?
just olya [345]

Answer:

Explanation:

Force = Mass * acceleration due to gravity.

Given

Mass of the paratrooper = 57kg

Acceleration due to gravity = 9.81m/s²

Required

Force pulling him down

Substitute unto formula;

F = 57 * 9.81

Force = 559.17 N

Hence the force pulling him down is 559.17N

7 0
2 years ago
An infinite conducting cylindrical shell of outer radius r1 = 0.10 m and inner radius r2 = 0.08 m initially carries a surface ch
gayaneshka [121]

Answer:

Explanation:

Solution is in the picture attached

8 0
2 years ago
A laboratory dish, 20 cm in diameter, is half filled with water. One at a time, 0.50/µL drops of oil from a micropipette are dro
aleksklad [387]

Answer:

n = 1.45

Explanation:

Given:

- Diameter of the dish d = 0.2 m

- Volume per drop V/drop = 0.5 uL

- wavelength of incident light λ = 600 nm

- minimum intensity @ 13 drops

- refractive index of oil : n

Find:

What is the index of refraction of the oil?

Solution:

- Destructive interference can be seen @ 13 drops. So we will use the relation of destructive interference:

                                 n = m*λ / 2*t

- Compute the thickness of the film.

              Volume of film = 0.5*13*10^-9 = 6.5*10^-9 m^3

                     Volume of cylinder = pi*d^2 / 4 * t

                       pi*d^2 / 4 * t = 6.5*10^-9 m^3

                t = 4*(6.5*10^-9 )/ pi*0.2^2 = 2.069*10^-7 m

- Use the given relation @ m = 1:

                                      n = λ / 2*t

                                      n = (600*10^-9) / 2*2.069*10^-7

                                      n = 1.45

3 0
2 years ago
7. A stick of length L and mass M is hanging at rest from its top edge from a ceiling hinged at that point so that it is free to
Lilit [14]

Answer:

The distance from the top of the stick would be 2l/3

Explanation:

Let the impulse 'FΔt' acts as a distance 'x' from the hinge 'H'. Assume no impulsive reaction is generated at 'H'. Let the angular velocity of the rod about 'H' just after the applied impulse be 'W'. Also consider that the center of percussion is the point on a bean attached to a pivot where a perpendicular impact will produce no reactive shock at the pivot.

Applying impulse momentum theorem for linear momentum.

FΔt = m(Wl/2), since velocity of center of mass of rod  = Wl/2

Similarly applying impulse momentum theorem per angular momentum about H

FΔt * x = I * W

Where FΔt * x represents the impulsive torque and I is the moment of inertia

F Δt.x = (ml² . W)/3

Substituting FΔt

M(Wl/2) * x = (ml². W)/3

1/x = 3/2l

x = 2l/3

8 0
2 years ago
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