sec 1 Term 2

name;

a body of mass 0.01kg moves in a circular path of radius 150cm.if the body makes one revolution in 3s,so the force is …..

• A - 0.066 N to tangent direction
• B – 6.585 N to tangent direction
• C -0 .066N toward the center of the circular path
• D – 6.585 Ntoward the center of the circular path

A particle moves in a circular path of radius 25 cm due to the effect of a centripetal force that equal 4 times the particle mass , so the tangential velocity after quarter a revolution is

• A – 0.5m/s
• b – 1m/s
• c – 1.5m/s
• d – 2m/s

when the velocity of the satellite become more than its orbital velocity ,the…………….

• A – satellite still rotate around earth
• b- satellite escape to space
• c – satellite fall down toward earth
• d – satellite velocity dos not change

the opposite figure shoes 2 bikes with 2 diff. velocities with constant magnitude in a circular path .if thy reach at the same moment which of them has the largest tangential velocity?

• A – Bike 1
• B- Bike 2
• c - Both have same velocity

The opposite figure represent the motion of Earth around sun in acricular path ,the direction of the centripetal acceleration is…………..

• a- opposite to the direction of F
• b- in the same direction of F
• c- perpendicular to the direction of F
• d – in the same direction of tangential velocity of the Earth

2 objects A and B move along the circumference of the same velocity where mA= mB so the acceleration of A is ……with B

• A – equal
• B- double
• c- half
• D - quarter

A planet of mass 10^20 kg rotate in a circular path , the displacement of its quarter cycle is 1.4*10^10 m and covers half a cycle within 10^6 s . so the centripetal force on the planet is ….

• A - 2π*10^10 N
• π*10^20 N
• C – π^2*10^18 N
• D – 10^30

If a washing machine has a centripetal acceleration of 4302 m/s2 and radius of 20cm then it completes 700 revolution in …….

• A – 1 min
• b- 3 min
• c- 5 min
• d- 7 min

The moon takes 27.3 days to orbit the earth at an average radial distance of 385000 km from the center of the earth what is the acceleration of the moon?

• A – 1.94*10^-3 m/s2
• b – 2.73*10^-3 m/s2
• c – 9.80
• d- 4.96*10^-3 m/s2