Question

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?

Answer 1

Can you give me the equation of impulse?

Answer 2

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

Answer 3

i thnk both balls have same impulse dnt u thnk?

Answer 4

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

Answer 5

yeah n p=mv is the realation

Answer 6

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

Answer 7

LOL ^^

Answer 8

no

Answer 9

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 ?

Answer 10

You mean the direction ?

Answer 11

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

Answer 12

You must be knowing right hand thumb rule ?

Answer 13

yeah but i just didnt remember it

Answer 14

isnt it zero?

Answer 15

Nop it isnt

Answer 16

Both will add up,

Answer 17

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

Answer 18

if they are in same then they will be added up

Answer 19

or it will be out of the paper?

Answer 20

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

Answer 21

it will be zero
:)

Answer 22

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?

Answer 23

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 ?

Answer 24

. 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

Answer 25

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