momentum - circular motion

A body of mass 40 Kg is placed on the surface of the moon , then its weight on the earth = .............. knowing that ( g_earth = 10 m/s² and g_moon = 1.6 m/s² )

• 400

• 392

• 66

• 60

Sand truck moves in a highway under the effect of constant force , if the sand leaked gradually through a hole in the truck , then the truck's acceleration will ..........

• decrease

• increase

• remains constant

• decrease then increase

the ratio between the acting force on a body and its mass according to Newton's second law is ..................

• 0.5 a

• a

• 1.5 a

• 2 a

Player applies force 100 N on a ball of mass 5 Kg over a time period 1.5 s before he release the ball , if the ball starts from rest , so what will be its final velocity ?

• 5

• 10

• 20

• 30

A racing car can accelerate by changing

• its direction only

• its speed only

• either its direction or speed

• its direction and speed

an object of mass 0.5 Kg at rest , started to fall from a height of 180 Cm from the surface of the earth . so its momentum when it reaches the earth's surface is ..............

• 3 Kg.m/s

• 5 Kg.m/s

• 6 Kg.m/s

• 9 Kg.m/s

An aircraft moves in a horizontal loop of radius 1 Km with a steady speed of

250 m/s , so its centripetal acceleration = ................

• 9.2

• 6.25

• 5

• 8.25

A car of mass 750 Kg moves in a circle of diameter 80 m . if the centripetal force acting on the car is 7500 N , so its speed = ....................

• 20

• 400

• 800

• 28.28

An object of mass 0.01 Kg moves in a circular path of radius 150 cm , if it takes 3 s to make a complete revolution , then its centripetal force equals ....................

• 0.066

• 6.57

• 660

• 657

When a body falls freely towards the ground its ....................

• momentum increases

• mass increases

• velocity decreases

• weight increases