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Ksju [112]
3 years ago
5

PLEASE HELP!!! SCIENCE QUESTION!

Physics
2 answers:
Tatiana [17]3 years ago
5 0
C. has to be right, also its the only one that makes sense.
Hope this helps!
Cerrena [4.2K]3 years ago
4 0

Answer:

C. Electronic charges have electric fields surrounding them that allow them to exert forces on other objects without touching them.

Explanation:

All the electric charges have electric field in the region surrounding them

This electric field is given as

E = \frac{kq}{r^2}

above formula is the electric field due to a point charge in the surrounding region of it.

Now due to this electric field when other charges comes into this region they will experience electric force on them which is given as

F = qE

due to above reason two charges either attract or repel each other

so correct answer will be

C. Electronic charges have electric fields surrounding them that allow them to exert forces on other objects without touching them.

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A car moves with a speed of 72 km/h for 15 minutes and then with a speed of 80 km/h for the next 12 minutes. The total distance
sukhopar [10]

Answer:

The total distance covered by the car is 3,810.08 m

Explanation:

Given;

initial speed of the car, u = 72 km/hr = 20 m/s

initial time, t₁ = 15 minutes = 900 s

final speed of the car, v = 80 km/hr = 22.22 m/s

final time, t₂ = 12 minutes = 720 s

The acceleration of the car is given as;

a = \frac{v-u}{t_2 -t_1} \\\\a = \frac{22.22-20}{900-720}\\\\a = 0.0123 \ m/s^2

The total distance covered by the car is given as;

v² = u² + 2as

where;

s is the total distance covered by the car

22.22² = 20² + 2(0.0123)s

22.22²  - 20² = 2(0.0123)s

93.728 = 0.0246s

s = 93.728 / 0.0246

s = 3,810.08 m

Therefore, the total distance covered by the car is 3,810.08 m

8 0
3 years ago
Read 2 more answers
How does the centripetal force depend on speed, radius and the revolving mass?
Mnenie [13.5K]

Answer:

Mass velocity and radius are all related to centripetal force

Explanation:

By frequency of its rotation and the radius of the circular path along which objects moves

6 0
3 years ago
Please please help i have to turn in
larisa [96]
Hi,

I've found a link that should assist you or answer your question.
http://click.dji.com/ANbvbbP7bwUWtSACp6U_?pm=link&as=0004

Have a nice day!
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3 years ago
What is the average speed of a car that moved 40 km in 3 hours?
Naya [18.7K]

<u>A</u> would be the answer, since it would take about 3 hours to cover most of it, 10km/h would be the average speed.


really hope this helps.

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How does surface area affect the amount of air resistance an object experiences?
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The greater the cross-sectional area of an object, the greater the amount of air resistance it encounters since it collides with more air molecules. ... It will have to accelerate for a longer period of time before there is enough upward air resistance to balance the downward force of gravity.
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