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JulijaS [17]
3 years ago
12

A ball rolls across the floor at a constant speed, what will happen to it if there is no friction?

Physics
1 answer:
Pepsi [2]3 years ago
7 0

the ball will stay moving at the same rate of speed until something happens and stop it

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An airplane flies at 400 km/h in a 100km/h hurricane crosswind. Find the resultant speed of the plane.
kow [346]
I think the airplan flies in same speed 400
5 0
3 years ago
A truck is traveling due north at 50 km/hr approaching a crossroad. On a perpendicular road a police car is traveling west towar
kirill [66]

Answer:45\hat{i}+50\hat{j}

Explanation:

Truck velocity=50 km/hr

police car velocity =45 km/hr

Let they start at t=0 s

After one hour

truck displacement=50\times 1=50 km

In vector Form(r_1)=50\hat{j}

For Police car displacement=45\times 1=45 km

in vector form(r_2)=-45\hat{i}

r_{12}=50\hat{j}-(-45\hat{i})

r_{12}=45\hat{i}+50\hat{j}

8 0
3 years ago
8. A car initially has 100 J of total energy. After driving down the road, the car's
sveta [45]

The work done on the car is -20 J.

Work done on the car is negative, meaning that the car actually does work on the external system.

<h3>Energy and law of conservation of energy</h3>
  • Energy is the ability to do work
  • the law of conservation of energy states that the total energy in a system is conserved

From the law of conservation of energy, the initial energy of the car before it moves down the road remains constant or unchanged.

  • Initial energy = 100 J
  • Initial energy = Final energy - work done on car
  • Final Energy = Work done on car + initial energy

80J = Work done on car + 100 J

Work done on car = 80 - 100J

Work done on car = -20 J

Hence, the work done on the car is -20 J

Work done on car is negative.

Since work done on the car is negative, it means that the car actually does work on the external system. Hence, the decrease in the energy of the car.

Learn more about energy and work at: brainly.com/question/13387946

8 0
2 years ago
A SMART car can accelerate from rest to a speed of 28 m/s in 20s. What distance does it travel in this time?
sashaice [31]
Speed= distance/ time so distance = speed * time= 28 * 20= 560m .. so the answer is 560m.. l hope it helped :)
6 0
2 years ago
1. Who first published the classification of the elements that is the basis of our periodic table today?
Gre4nikov [31]
That particular group of elements is reffered to as the "Noble Gasses"--a title that comes from the fact that these gases are very "secure" and don't mix well with other elements.
4 0
3 years ago
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