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kari74 [83]
2 years ago
6

Which is true about forensic testing? Forensic scientists must accurately interpret test results Evidence testing is no longer r

eliable All tests are fully automated Forensic scientists never make mistakes
Physics
1 answer:
Nana76 [90]2 years ago
5 0

Answer:

Forensic scientists must accurately interpret test results

Explanation:

Misinterpreting test results could mean someone being falsely accused of a crime which you would want to avoid.

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Which statement does not correctly describe a theory?
julia-pushkina [17]
The statement that does not correctly describe a theory is D. It is based on scientific evidence.
5 0
3 years ago
Read 2 more answers
1. The difference between a sensor and a transducer is that in a transducer: A. no calibration is required for it to be used B.
Rom4ik [11]

Answer:

Explanation:

1

The difference between a sensor and a transducer is that in a transducer no electrical power is required at any time

2.

An interlock is a safeguard mechanism for coordinating the activities of two or more devices and preventing one device from interfering with the operation of others.

3

An actuator can also be classified as a transducer depending on whether the physical output has a relationship with the input signal......True

4

8 0
2 years ago
Water at 288.7 k flows through a 15.24-cm. diameter horizontal pipe into a 190-l drum. determine the minimum time it will take t
nikdorinn [45]

The flow will be laminar if Reynold's numberN_{R} is less than 2000.

Use the Reynold's formula and rearrange to calculate velocity of water in the pipe.

N_{R} = \frac{v D}{\nu}

Where, v is velocity of the fluid, D is the diameter of pipe, and \nu is the kinematic viscosity i.e. 1.12 \times 10^{-6} m^2/s for water at 288.7 K from Appendix.

So, velocity is:

v = \frac{N_{R} \nu}{D}

The flow rate <em>Q</em>:

Q = vA=v\pi D^2/4=\frac{\frac{N_R \nu}{D} \pi D^2}{4} =[tex] t = \frac{V}{\frac{N_R \nu \pi D}{4}} = \frac{4V}{N_R \nu \pi D} =\frac{4 \times 190 L\frac{10^{-3} m^3}{L}}{2000 \times 1.12\times 10^{-6} m^2/s \pi 15.24 cm\frac{1 m}{100 cm}}  = 2226.3 s \frac{1 min}{60 s}= 37.1 min [/tex]

Where A is the area of cross section of pipe.

The time taken to fill is:

t = Q/V

Where V is the capacity of the tank.


7 0
3 years ago
A 2.0 kg book is lying on a 0.78 m -high table. You pick it up and place it on a bookshelf 2.1 m above the floor.Part ADuring th
zloy xaker [14]

Given data:

* The mass of the book is 2 kg.

* The initial height of the book is 0.78 m.

* The final height of the book is 2.1 m.

Solution:

(A). The work done by the gravity on the book is,

W=mg(h_f-h_i)

where m is the mass, g is the acceleration due to gravity, h_i is the initial height and h_f is the final height,

The work is done in moving the object in upward direction where as the gravitational force is acting in the down ward direction. Thus, the value g (acceleration due to gravity) is taken as negative in this case.

Substituting the known values,

\begin{gathered} W=2\times(-9.8)\times(2.1-0.78) \\ W=-19.6\times1.32 \\ W=-25.9\text{ J} \end{gathered}

Thus, the work done by the gravitational force is -25.9 J.

(B). The work done by the hand on the moving the book is,

\begin{gathered} W_1=-W \\ =25.9\text{ J} \end{gathered}

Thus, the work done by the hand on the book is 25.9 J.

7 0
8 months ago
A thin rod of length 0.75 m and mass 0.42 kg is suspended freely from one end. It is pulled to one side and then allowed to swin
Goshia [24]

Answer:

(A) 0.63 J  

(B) 0.15 m

Explanation:

length (L) = 0.75 m

mass (m) =0.42 kg

angular speed (ω) = 4 rad/s

To solve the questions (a) and (b) we first need to calculate the rotational inertia of the rod (I)

I = Ic + mh^{2}  

Ic is the rotational inertia of the rod about an axis passing trough its centre of mass and parallel to the rotational axis

h is the horizontal distance between the center of mass and the rotational axis of the rod

I = (\frac{1}{12})(mL^{2} ) + m([tex]\frac{L}{2})^{2}[/tex]

I = (\frac{1}{12})(0.42 x 0.75^{2} ) + ( 0.42 x ([tex]\frac{0.75}{2})^{2}[/tex])

I = 0.07875 kg.m^{2}

(A) rods kinetic energy = 0.5Iω^{2}

  = 0.5 x 0.07875 x 4^{2} = 0.63 J   0.15 m

(B) from the conservation of energy

   initial kinetic energy + initial potential energy = final kinetic energy + final potential energy

   Ki + Ui = Kf + Uf

   at the maximum height velocity = 0 therefore final kinetic energy = 0

   Ki + Ui = Uf

   Ki = Uf - Ui

 Ki =  mg(H-h)

where (H-h) = rise in the center of mass

     0.63 = 0.42 x 9.8 x (H-h)

   (H-h) = 0.15 m

6 0
2 years ago
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