Question

(a) Identify the kind of motion in the following cases:

(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.

2. (a) Define average speed.

(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.

3. Define uniform and non-uniform motion. Write one example for each.

4. What does the odometer of an automobile measure? Which of the following is

moving faster? Justify your answer.

(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.

5. A car travels from stop A to stop B with a speed of 30 km/h and then returns

back to A with a speed of 50 km/h. Find

(i) displacement of the car.

(ii) distance travelled by the car.

(iii) average speed of the car.

6. Velocity-time graph for the motion of an object in a straight path is a straight line

parallel to the time axis.

(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.​

Answer 1

Answer:

Nature is made of everything we see around us – trees, flowers, plants, animals, sky, mountains, forests and more. Human beings depend on nature to stay alive. Nature helps us breathe, gives us food, water, shelter, medicines, and clothes.