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galina1969 [7]
4 years ago
6

Which is a example of speed? A)Cindy biked westward at 30km/h B)A Rock is the the left of a flowerpot C) A dog runs an average o

f 8mp/h D) Leo lives 2miles north of Andre
Physics
2 answers:
r-ruslan [8.4K]4 years ago
5 0
Hey there!

Here is your answer:

<u>The proper answer to this question is option C "</u><span><u>A dog runs an average of 8mp/h".</u>

Reason:

<u>The sentence </u></span><span><u>A dog runs an average of 8mp/h (option C) is a example of speed because it is telling the average SPEED of a dog which is 8 miles per hour.</u>

Also....

<u>Its not option A because km/h is a distance. Its not option B because its just saying where the rock is located. Its also not option D because its just saying the distance of where Leo lives.</u>

Therefore the answer is option C.

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit</span>
finlep [7]4 years ago
4 0
I think the answer is A) Cindy biked westward at 30km/h. I'm sorry if I'm wrong. If that's not correct then it's definitely C) A dog runs an average of 8mp/h. I hope this helps. :) 
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A 0.10 g honeybee acquires a charge of +23 pC while flying.
kari74 [83]

Answer:

a) \frac{F}{w} =2.347\times 10^{-6}\ N

b) E=4.2609\times 10^7\ N.C^{-1} parallel to the earth surface.

  • In this case according to the Fleming's left hand rule the direction of movement of bee must be in a direction parallel to the earth surface and perpendicular to the electric field at the same time.

Explanation:

Given:

mass of the bee, m=10^{-4}\ kg

charge acquired by the bee, q_2=23\times 10^{-12}\ C

a.

Electrical field near the earth surface, E=100\ N.C^{-1}

Now the electric force on the bee:

we know:

F=\frac{1}{4\pi.\epsilon_0} \times \frac{q_1.q_2}{r^2}

F=E.q_2

F=100\times 23\times 10^{-12}

F=23\times 10^{-10}\ N

The weight of the bee:

w=m.g

w=10^{-4}\times 9.8

w=9.8\times10^{-4}\ N

Therefore the ratio :

\frac{F}{w} =\frac{23\times 10^{-10}}{9.8\times10^{-4}}

\frac{F}{w} =2.347\times 10^{-6}\ N

b.

The condition for the bee to hang is its weight must get balanced by the electric force acing equally in the opposite direction.

So,

F=9.8\times10^{-4}\ N

E.q_2=9.8\times10^{-4}\ N

E\times 23\times 10^{-12}=9.8\times10^{-4}\ N

E=4.2609\times 10^7\ N.C^{-1} parallel to the earth surface.

  • In this case according to the Fleming's left hand rule the direction of movement of bee must be in a direction parallel to the earth surface and perpendicular to the electric field at the same time.
3 0
3 years ago
The plate near the Artic Ridge is among those with the slower growth rates, moving slightly less than 2.5 cm/year. How much will
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Greater than 25 . 2.5 x 10 = 30
4 0
3 years ago
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The Doppler effect occurs when a source of sound moves
Dmitrij [34]

The Doppler effect occurs when a source of sound or light
moves either toward or away from the observer.

4 0
3 years ago
A ball of radius r rolls on the inside of a track of radius R. If the ball starts from rest at the vertical edge of the track, f
meriva

Answer:

v=\sqrt{\dfrac{10g(R-r)}{7}}

Explanation:

Given that

Radius of track = R

Radius of ball = r

The ball can be treated as solid sphere, so

The moment of inertia of ball

I=\dfrac{2}{5}mr^2

When the ball reach at the lowest position then it will have both angular and linear speed.

Condition for  rolling without slipping       v= ωr

Form energy conservation

mgR=mgr+\dfrac{1}{2}mv^2+\dfrac{1}{2}I\omega^2

 v= ωr

I=\dfrac{2}{5}mr^2

mgR=mgr+\dfrac{1}{2}mv^2+\dfrac{1}{2}\times \dfrac{2}{5}mr^2\omega^2

mg(R-r)=\dfrac{1}{2}mv^2+\dfrac{1}{2}\times \dfrac{2}{5}mv^2

2mg(R-r)=mv^2+\dfrac{2}{5}mv^2

2g(R-r)=\dfrac{7}{5}v^2

v=\sqrt{\dfrac{10g(R-r)}{7}}

3 0
3 years ago
A 4kg object is moving at a speed of 5 m/sec.how much kinetic energy does the objects have
nikklg [1K]

Answer:

20

Explanation:

3 0
3 years ago
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