Question

A particle is moving in a circular path of radius r. The velocity of the body in a given time t is ​

Answer 1

Answer:

circle would be:

(a) Zero (b) π r (c) 2 r (d) 2π r

Q2. The numerical ratio of displacement to distance for a moving object is

(a) always less than 1 (b) always equal to 1

(c) always more than 1 (d) equal or less than 1

Q3. i)Classify the given quantities as Scalar or Vector and Write their S.I unit :

Distance, displacement, speed , velocity , acceleration.

ii) Write the formulas of the following quantities : speed, velocity, average speed ,

average velocity, acceleration, and 3 equation of motion.

Q4. A ball is thrown upwards and it goes to the height 100 m and comes down.

i) What is the net displacement?

ii) What is the net distance?

Q5. i) What can you say about motion of an object whose distance time graph is a straight line parallel to the time axis?

ii) Which quantity is measured by the area occupied under velocity- time graph?

Q6. Draw a velocity –time graph of a stone thrown vertically upwards and then coming downwards after attaining the maximum height.

Q7. Kiara hired a taxi and noted the initial reading of its odometer as 24803 km. After the journey, she noted the final reading of the odometer as 25118 km. If the journey took 4 hours 40 minutes, Calculate the average speed of the taxi during the entire journey.

Q8. The velocity-time graph (Fig. ) shows the motion of a cyclist. Find (i) its acceleration (ii) the distance covered by the cyclist in 15 second

Q9. A body travels 50 km at an average speed of 60km/h and returns at an average speed of 80km/h . Find average speed of the whole journey.

Q10. A marble rolling on a smooth floor has an initial velocity of 0.4m/s. If the floor offers a retardation of 0.02m/s2, Calculate the time it will take to come to rest.

Q11. Consider a car being driven along a straight road. The velocity of the car in m/s at different instants of time is shown in the following table. Draw velocity –time graph for motion of the car. Obtain the value of acceleration of the car from the graph.

Time(s) 0 10 20 30 40 50

Velocity(m/s) 0 5 10 15 20 25

Q12. The velocity time graph of two bodies A and B traveling along the +x direction are given in the figure

(a) Are the bodies moving with uniform acceleration?

(b) Which body is moving with greater acceleration A or B? Give reason

WHO WILL GIVE CORRECT ANSWER WILL BE MARKED AS BRAINLIEST!!!!!!!!!!!!

Explanation:

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Answer 2

Answer:

The total distance to be travelled by the body is

$2\pi \: r$

which is also the circumference of the circle.

We know that speed =Distance/Time

therefore:

$v = 2\pi \: r \div t$

Hence option (4) is correct.