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Phoenix [80]
3 years ago
5

What is a situation in which friction is helpful?

Physics
1 answer:
bagirrra123 [75]3 years ago
8 0
When driving a car on the road
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A jogger runs 6 km north ,5 km east then another 4km north her average speed 8 km how long will it take her to complete her run
LekaFEV [45]

The time taken to complete her run is 1.9 hr.

<u>Explanation:</u>

Speed is a scalar quantity and it is defined as the ratio of distance covered to the time taken to cover that distance. As distance is also a scalar quantity, so the directions given in the problem can be ignored. Thus, the distance covered by the jogger is the sum of kilometers given in problem.

Distance covered = 6+5+4 = 15 km

And the speed is given as 8 km/hr.

So the time taken will be ratio of distance to speed.

\text { time }=\frac{\text {distance}}{\text {speed}}=\frac{15}{8}=1.9 \text { hour }

So the jogger will take 1.9 hr to complete her run.

8 0
3 years ago
What types of collisions can result from making unsafe passes?
SSSSS [86.1K]
<span>Unsafe passes are passes with restricted line of sight, passes with cross traffic, narrow passes which are unsafe. 
Several collision can result from making unsafe passes. Some of them are: 
-getting run off the road
-getting sideswiped
-getting hit head-on</span>
7 0
3 years ago
If an object is not accelerating, how many<br> forces act on it?
poizon [28]

Answer:

If there are no forces acting upon the object, then there is no acceleration. If there is no acceleration, then the object will move with a constant velocity.

Explanation:

8 0
3 years ago
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How many times does the earth spin in a year
sp2606 [1]
It spins one bc it takes 365 days to make a year and to make a year the earth has to mov some
7 0
3 years ago
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A black hole in the universe is a An empty region in space b- A massive collapsed star c- A moon that is always turned to its da
marusya05 [52]

Answer:

b. a massive collapsed star

Explanation:

A black hole in the universe is nothing but a massive collapsed star. When the size of the star crosses a particular limit it cannot holds its mass and it collapses under it own self. This is called supernova. A black hole is actually a region in space where gravity is so strong that even light cannot escape through it. Gravity so strong because the matter has been pressed into a tiny space. hence option b is correct

4 0
3 years ago
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