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2 years ago

7

What is the full meaning of D.D.T

1 answer:

kogti [31]2 years ago

4 0

Dichloro-Diphenyl Trichloroethane- it was developed as the first of the modern synthetic insecticides in the 1940s.

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Your boat capsizes but remains floating upside down. what should you do?

Ludmilka [50]

<span>You should stay on the top of the boat, this will help rescuers find you because a boat is easier to find than a small body in a large ocean. Never swim away from the boat you could catch a cold and/ or get hypothermia or drift far away from where you were last seen. This will make the search much harder.</span>

5 0

2 years ago

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If a string vibrates at the fundamental frequency of 528 Hz and also produces an overtone with a frequency of 1,056 Hz, this o

Leto [7]

your answer is *A. *second harmonic.

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3 years ago

An escalator carries you from one level to the next in an airport terminal. The upper level is 4.4m above the lower level, and t

horrorfan [7]

Answer:

Part a)

$W = 2716.5 J$

Part B)

$W = -2716.5 J$

Explanation:

Part A)

While escalator is moving up work done to move the person upwards is given as

$W = mgh$

here we know that

m = 63 kg

h = 4.4 m

now we have

$W = 63 \times 9.8 \times 4.4$

$W = 2716.5 J$

Part B)

Work done while we move from up to down

So we have

$W = - mgh$

so we have

$W = -2716.5 J$

6 0

2 years ago

A property unique to a conducting substance that determines its resistance is called:

elena-s [515]

Answer:

B. Resistivity

Explanation:

Resistance offered by a substance of unit area per unit length.

6 0

2 years ago

Two speakers, one directly behind the other, are each generating a 240-Hz sound wave. What is the smallest separation distance b

AveGali [126]

Answer:

The smallest separation distance between the speakers is 0.71 m.

Explanation:

Given that,

Two speakers, one directly behind the other, are each generating a 240-Hz sound wave, f = 240 Hz

Let the speed of sound is 343 m/s in air. The speed of sound is given by the formula as :

$v=f\lambda\\\\\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{343\ m/s}{240\ Hz}\\\\\lambda=1.42\ m$

To produce destructive interference at a listener standing in front of them,

$d=\dfrac{\lambda}{2}\\\\d=\dfrac{1.42}{2}\\\\d=0.71\ m$

So, the smallest separation distance between the speakers is 0.71 m. Hence, this is the required solution.

3 0

3 years ago

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