## aliza.khan 2 years ago Two balls are dropped from a height of 6 m. Ball A bounces back up to a height of 4m whereas ball B bounces back up to 2m. Which ball experiences the larger impulse during its collision with the floor?

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1. bahrom7893

Can you give me the equation of impulse?

2. shubhamsrg

We need not calculate magnitude of impulse here, one experiencing larger impulse will rise higher.

3. aliza.khan

i thnk both balls have same impulse dnt u thnk?

4. shubhamsrg

impulse roughly can be said as change in momentum. That is a hint.

5. aliza.khan

yeah n p=mv is the realation

6. shubhamsrg

If a balls has risen higher, it means it must have greater initial velocity at the bottom ?

7. ParthKohli

LOL ^^

8. aliza.khan

no

9. aliza.khan

Two wires lie in the plane of paper and carry equal current in opposite direction as shown. At a point midway between the wires, the magnetic field is ?

10. shubhamsrg

You mean the direction ?

11. aliza.khan

yeah the magnetic field is it out of the paper? its zero into the paper or at the bottom of paper?

12. shubhamsrg

You must be knowing right hand thumb rule ?

13. aliza.khan

yeah but i just didnt remember it

14. aliza.khan

isnt it zero?

15. shubhamsrg

Nop it isnt

16. shubhamsrg

17. aliza.khan

y? they are in opposite directions they cancel the effect n become zero

18. aliza.khan

if they are in same then they will be added up

19. aliza.khan

or it will be out of the paper?

20. shubhamsrg

You got to revise your right hand thumb rule to understand that, for same direction, magnetic fields cancel in between.

21. aliza.khan

it will be zero :)

22. aliza.khan

The coefficient of static friction between car’s tires and a level road is 0.80. If the car is to be stopped in a maximum time of 3.0 s, its maximum speed is (a) 2.4 m/s (b) 23.5 m/s (c) 7.8 m/s (d) 2.6 m/s whch equation will be applied here?

23. aliza.khan

A body moving with uniform acceleration has velocities 20 m s -1 and 30 m s -1 when passing through points A and B. Then wht the velocity mid-way between A and B is ?

24. aliza.khan

. A monkey of mass 20-kg rides on a 40-kg trolley moving with constant speed of 8 ms -1 along a horizontal track. Frictional forces can be neglected. If the monkey jumps vertically with respect to the moving trolley to grab the overhanging branch of a tree, the speed of the trolley after the monkey has jumped off is

25. AravindG

It is advised you post each question separately .Also try to post these questions in Physics Group