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3 years ago

Pesticides sprayed on the plants in fields become When they settle and drip onto the soil .

Physics

2 answers:

Misha Larkins [42]3 years ago

8 0

Answer:nutrients

Explanation:

rjkz [21]3 years ago

3 0

Answer:

pollutants is the right answer.

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A copper cable needs to carry a current of 160 A with a power loss of only 2.0 W/m. What is the required radius of the copper ca

lesantik [10]

Answer:

The radius of the cable is 0.0083 m or 8.3 mm.

Explanation:

The resistance of copper cable of 1 meter length will be given by

$R_{cable} = \frac{\rho \times l}{a}$ .... (i)

where the resistivity of copper is $\rho = 1.7 \times 10^{-8} \Omega.m$ , and l is the length of the wire which is considered to be 1m, and a is the cross sectional area of the wire in $m^{2}$ .

From the formula of power we know that, $P = I^2 R$ .... (ii)

Therefore 2 W/m = $(160)^2 \times R$ .... (iii)

where the resistance,R, actually means the resistance of the cable per meter.

Therefore R ( resistance of cable per meter)

= $\frac{2}{160^2} = 7.812 \times 10^{-5}$ ohms / meter. .... (iv)

Therefore from (i)

$7.812 \times 10^{-5}$ = $\frac{1.7 \times 10^{-8} \times 1}{a} = \frac{1.7 \times 10^{-8} \times 1}{\pi r^{2} }$ ..... (v)

where cross sectional area of the cable, a = $\pi r^2$ ,

where r is the radius of the cable, and length of cable,l = 1m.

Therefore r = $\sqrt{\frac{ 1.7 \times 10^{-8}}{\pi \times 7.812 \times 10^{-5} } } = 0.0083m = 8.3 mm$

5 0

4 years ago

A scientist is trying to determine whether a newly observed phenomenon can be described as a wave. Which of the following questi

Step2247 [10]

Answer:

B. does it transfer energy

A wave is a disturbance in a medium. Particles vibrate and TRANSFER their ENERGY to their neighbors.

7 0

3 years ago

What is sound wave and examples

Nezavi [6.7K]

★ « what is sound wave and examples » ★

A sound wave is the pattern of disturbance caused by the movement of energy traveling through a medium (such as air, water, or any other liquid or solid matter) as it propagates away from the source of the sound. The source is some object that causes a vibration, such as a ringing telephone, or a person's vocal chords.

hope it helps

3 0

3 years ago

Movies and TV shows sometimes portray a person being thrown backwards a sizable distance as a result of being struck by a bullet

MAXImum [283]

Answer:

R = 4.24 x 10⁻⁴ m

Explanation:

given,

mass of the person = 60.3-kg

mass of the bullet = 10 gram = 0.01 Kg

velocity of bullet = 389 m/s

angle made with the horizontal = 45°

using conservation of momentum.

M v + m u = ( M + m ) V

60.3 x 0 + 0.01 x 389 = (60.3 + 0.01) V

$V = \dfrac{3.89}{60.31}$

V = 0.0645 m/s

for calculation of range

$R = \dfrac{V^2sin 2 \theta}{g}$

$R = \dfrac{0.0645^2sin 2 (45^0)}{9.8}$

R = 4.24 x 10⁻⁴ m

the distance actor fall is R = 4.24 x 10⁻⁴ m

6 0

4 years ago

Paula has walked in a straight line, 30.5° north of west, for 1650 meters. How far south and east should she walks to return to

olchik [2.2K]

The answer is A.
Sy = 1650 x sin30.5 = 837.4 m toward south
Sx = 1650 x cos30.5 = 1421.7 m toward east

8 0

3 years ago