Question

Answer all the questions-
1. What does the abbreviation C.G.S, M.K.S and F.P.S stand for?
2. Giving two examples each differentiate between scalars and vectors.
3. Define
i. Uniform and Non-uniform motion.
ii. Acceleration and De-acceleration.
4. Clearly stating the symbols used state the three equations of motion (both
the sets- when an object is moving in a straight-line path and when it is
under the effect of acceleration due to gravity).
5. Vinay rides his bicycle and covers 80m in 20 seconds. Calculate his speed in
km/hr.
6. A person is moving on a circular path of radius 21m. If he takes 5.5 rounds
of the circular track what is the total distance and displacement of the
person?
7.
Use the diagram to determine the resulting displacement and the distance
travelled by the skier during the three minutes of his motion from A to B to
C to D.
8. A train travels 20km at a uniform speed of 60km/h and the next 20km at a uniform speed of 80km/h. Calculate its average speed.
9. A train travels a total distance of 200km. For 40km it takes 1-hour, next 100km it takes 1.5hr and the rest with some speed. If the average speed of the entire journey is 60km/hr, find speed of the train in the last part of the journey.
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10. A car starts moving from rest and attains a velocity of 10m/s in 40seconds. The driver applies the brakes and slows down the car to 5m/s
in 10seconds. Find the acceleration of the car in both the cases.
11. From the roof top of a 250m tall building an object of mass 01 kg is dropped. Calculate the time which the object will take to reach the earth surface and the velocity with which it will strike the earth surface.
( g = 10m/s2, √ 2 = 1.414)
12. A car starts from rest and moves along the x-axis with constant acceleration of 5 ms–2 for 8 seconds. If it then continues with constant velocity, what distance will the car cover in 12 seconds since it started from the rest?
13. A spy satellite is moving at a height of 200km above the earth’s surface with a speed of 7.8km/s. Taking the radius of the earth surface as 6400km calculate the time taken by the satellite to make one complete round.
14. From the position/distance- time graph calculate the speed of the object between points AB and BC.
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15. A car initially at rest attains a speed of 20m/s in 5s and moves with the same speed for the next 20s, and then comes to rest for the next 10s.
i. Plot speed-time graph
ii. Find acceleration
iii.Find retardation
iv.Total distance covered.

Answer 1

Answer:

I don't understand this question