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3 years ago

If you walk 8km at an average speed of 4km/h, how much time does it take

Physics

2 answers:

PilotLPTM [1.2K]3 years ago

7 0

Distance = rate x time
8km = 4km/h x time
Time = 2 hours

Galina-37 [17]3 years ago

5 0

Answer:

2 hours

Explanation:

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by how many times occur in the force of attraction between two bodies change when the distance between then is reduced to one th

xenn [34]

Answer:

The force is now 9 times the original force

Explanation:

Coulomb's Law

The electrostatic force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Coulomb's formula is:

$\displaystyle F=k\frac{q_1q_2}{d^2}$

Where:

$k=9\cdot 10^9\ N.m^2/c^2$

q1, q2 = the particles' charge

d= The distance between the particles

Suppose the distance is reduced to d'=d/3, the new force F' is:

$\displaystyle F'=k\frac{q_1q_2}{\left(\frac{d}{3}\right)^2}$

$\displaystyle F'=k\frac{q_1q_2}{\frac{d^2}{9}}$

$\displaystyle F'=9k\frac{q_1q_2}{d^2}$

$\displaystyle F'=9F$

The force is now 9 times the original force

8 0

2 years ago

What would happen to a moving object if no unbalanced force acts upon it? Help please?

Kisachek [45]

Answer:

Explanation:

if no force acts upon it it will just continue moving

hope this helps!! have a wonderfull day!

7 0

2 years ago

30 points for all 5 answers please

Lynna [10]

Answer:

he is doing science

Explanation:

8 0

2 years ago

13. You push with 56 N on a 15-kg box, and there is a 23-N force of friction. How fast will the box accelerate?

Flura [38]

Answer:

The acceleration is 2.2 m/s^2

Explanation:

In the attached image, we can see the free body diagram. And using the second law of Newton it will be possible to find the acceleration of the box.

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3 years ago

What are two ways an engineer can build a car in order for it to accelerate faster

Ket [755]

Explanation:

Take F=ma

a = F/m

For a higher, F higher or m lower

Means higher horse power for engine or lower mass for the car

4 0

2 years ago