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3 years ago

Which of the following statements uses a connotative word to evoke the most negative feeling?

Physics

2 answers:

irga5000 [103]3 years ago

7 0

I think it’ll be a or d

Genrish500 [490]3 years ago

7 0

It’s A yea gotta be or d

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Which types of interactions are negligible at standard temperature and pressure?

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Explanation: a reduction in genetic diversity and discomfort for animals that have very exaggerated characteristics.

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2 years ago

How does a change in resistance affect the conductivity of a material?

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Answer: the answer is B the lower the resistance,the higher the conductivity

Explanation:

Resistance is inversely proportional to conductivity,the lower the resistance the higher the conductivity,the metal silver has a very low resistance,thus it conductivity is high

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4 years ago

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A lady holds a large concave mirror of focal length 1.8m from her face.State two characteristics of her image in the mirror.

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Answer:

reflection and refraction?

Explanation:

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3 years ago

The pressure in a section of horizontal pipe with a diameter of 2.5 cm is 139 kPa. Water ï¬ows through the pipe at 2.9 L/s. If t

My name is Ann [436]

Answer:

d = 2*0.87 = 1.75 cm

Explanation:

by using flow rate equation to determine the speed in larger pipe

$\phi =\pi r^2 v$

$v = \frac{\phi}{\pi r^2}$

$= \frac{2900 cm^3/s}{3.14(1.25cm)^2}$

= 591.10 cm/s

= 5.91 m/s

by Bernoulli's EQUATION

$p1 +\frac{1}{2} \rho v1^2 = p2 +\frac{1}{2} \rho v2^2$

$139000+ \frac{1}{2}*1000*5.91^2 = 101000 +\frac{1}{2}*1000* v2^2$

solving for v2

v2 = 10.53 m/s

diameter can be determine by using flow rate equation

$q = v \pi r^2$

$r^2 = \frac{q}{\pi v}$

$= \frac{2900}{3.14*1053}$

r = 0.87 cm

d = 2*0.87 = 1.75 cm

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3 years ago

A velocity selector is built with a magnetic field of magnitude 5.2 T and an electric field of strength 4.6 × 10 ^ 4 N/C. The di

nydimaria [60]

Explanation :

Magnetic field, B = 5.2 T

Electric field, $E=4.6\times 10^4\ N/C$

The directions of the two fields are perpendicular to each other. Hence the force due to each field will equate each other.

Electrostatic force, F =qE.........(1)

Magnetic force, F = qvB........(2)

From equation (1) and (2)

E = v B

$v=\dfrac{E}{B}$

$v=\dfrac{4.6\times 10^4\ N/C}{5.2\ T}$

$v=0.88\times 10^4\ m/s$

$v=8.8\times 10^3\ m/s$

Hence, the correct option is (a).

(2) A permanent magnet always has two poles as the North pole and south pole. The magnetic field lines start from north poles and terminate at the south pole of the magnet.

Hence, the correct option is (C).

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3 years ago