ان شاء الله نحصل عندكم الإجابه !

في الفيزيكس !
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An object is said to be in dynamic equilibrium if it is moving at constant ........ in a straight ...........

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A car moving at constant speed in a circular race track is said to be in mechanical dynamic equilibrium.

T Or F انا اشوفها صح !
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An object is said to be in dynamic equilibrium if and only if

a. It moves at constant speed in a zigzag path
b. It moves at constant speed without changing direction
c. It moves with increasing speed in a straight line
d. It moves at constant speed
e. It moves in a straight line
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When you push a desk across the floor with a constant force of 85 N, the desk moves with a constant velocity. What is the magnitude of the friction force between the desk and the flour. (Use symbols to indicate the units).

 

The direction of the force of friction on an object is always ..... to the direction of motion of the object.
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An object at rest on an inclined plane must have a friction force acting on it to prevent it from sliding down.

True or
False

 

A car covers a distance of 87 km in 8 hours. What is the average speed of the car? (Use m/s to indicate the units). Express your answer to within two decimal places.
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Which of the following correctly describes velocity?

a. 10 m/s north
b. 120 km, 45 degrees north of east
c. 10 km/h
d. 50 miles/hour
e. 50 km west
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You are sitting in a bus that is traveling in a straight direction at a speed of + 60 km/h relative to the ground. The speed (relative to the bus) of another person sitting next to you would be

a. +120 km/h
b. larger than 60 km/h
c. -60 km/h
d. +60 km/h
e. zero km/h
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If, in a trip, you walk a distance of 19 km in 10 hours and another distance of 28 km in 5 hours, what is your average speed during the whole trip. (Use km/h to indicate units). Express your answer to within two decimal points.

 

يلا ياشباب ..

 

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