Motion

(i) A car moving with constant speed turning around a curve.

(ii) An electron orbitting around nucleus.

(b) An artificial satellite is moving in a circular orbit of radius 36,000 km. Calculate its speed if it takes 24 hours to revolve around the earth.

(b) A bus travels a distance of 120 km with a speed of 40 km/h and returns with a speed of 30 km/h. Calculate the average speed for the entire journey.

(i) A scooter moving with a speed of 300 m per I minute.

(ii) A car moving with a speed of 36 km per hour.

(i) displacement of the car.

(ii) distance travelled by the car.

(iii) average speed of the car.

(a) Identify the nature of motion of the body.

(b) Find the acceleration of the body.

(c) Draw the shape of distance-time graph for this type of motion.

(a) the speed acquired.

(b) the distance travelled.

(b) A particle moves over three quarters of a circle of radius r. What is the magnitude of its displacement?

(i) acceleration in m/s^{2}

(ii) distance covered by the bus in metres during this interval.

(a) the acceleration and

(b) the distance covered by the car in that time.

(a) distance covered by the scooterist,

(b) displacement of the scooterist, and

(c) time taken by the scooterist in reaching from A to B.

(b) Write any four examples of uniform circular motion.

(c) Is uniform circular motion accelerated motion?

(b) When is a body said to have uniform velocity?

(c) How can we describe the position of an object?

Illustrate with suitable example.

(i) What is the initial speed of the car?

(ii) What is the maximum speed attained by the car?

(iii) Which part of the graph shows zero acceleration?

(iv) Which part of the graph shows varying retardation?

(v) Find the distance travelled in first 8 hours.

(a) The acceleration from A to B

(b) The acceleration from B to C

(c) The distance covered in the region ABE

(d) The average velocity from C to D

(e) The distance covered in the region BCFE

Time (h) | 11.00 | 11.30 | 12.00 | 12.30 | 1.00 |

Distance (km) | 0 | 30 | 30 | 65 | 100 |

Plot the graph.

(i) Find the speed of the car between 12.00 hours and 12.30 hours.

(ii) What is the average speed of the car?

(iii) Is the car’s motion an example of uniform motion? Justify.

(b) A train starting from rest attains a velocity of 72 km/h in 5 minutes. Assuming the acceleration is uniform, find

(i) the acceleration.

(ii) the distance travelled by the train for attaining this velocity.