Home
Class 11
PHYSICS
Subtracting 2î + 7ĵ from î + ĵ gives a...

Subtracting 2î + 7ĵ from î + ĵ gives ______
a) -î – 6ĵ
b) 3î + 8ĵ
c) î + 6ĵ
d) 7ĵ

Text Solution

Verified by Experts

`Mass=50g=0.05kg`
`v=(2cos 45^0)veci-2sin45^0vecj`
`v_1=-2cos45^0veci-2sin45^0vecj`
a. Change in momentum `=mvecv-mvecv_1`
`0.05(2cos45^0veci-2sin45^0vecj)-`
`0.05-(-2cos45^0veci-2sin45^0vecj)`
`=0.1cos45^0vec-.1sin45^0veci+`
`0.1cos45^0veci+` ,Brgt `0.1cos45^0veci+0.1sin45^0vecj` ltbr. `=0.2cos45^0vecj`
`:. Magnitude =0.2/sqrt2=0.2828/2`
b The chasnge in magnitude of the momentum of the ball
`|vecP_2|-|vecP_1|-2xx0.5-2xx0.5=0`
Promotional Banner

Similar Questions

Explore conceptually related problems

If cot^(-1)(n/pi)>pi/6,n in N , then the maximum value of n is 6 (b) 7 (c) 5 (d) none of these

The distance of the point P(1,2,3) from the line (x-6)/(3) = (y-7)/(2) = (z-7)/(-2) is......

A = {1, 4} B= {2, 3, 6} and C= {2, 3, 7}, Verify the following result A xx (B-C) = (A xx B) - (A xx C)

Two numbers b and c are chosen at random with replacement from the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9. The probability that x^2+bx+cgt0 for all x in R, is

A = {1, 4} B= {2, 3, 6} and C= {2, 3, 7}, Verify the following result A xx (B nn C) = (A xx B) nn (A xx C)

A = {1, 4} B= {2, 3, 6} and C= {2, 3, 7}, Verify the following result A xx (B uu C)= (A xx B) uu (A xx C)

If the coordinates of the points A, B, C, D be (1, 2, 3), (4, 5, 7), (-4, 3, -6) and (2, 9, 2) respectively, then find the angle between the lines AB and CD.

The centroid of a triangle ABC is at the point (1, 1, 1). If the coordinates of A and B are (3, -5, 7) and (-1, 7, -6), respectively, find the coordinates of the point C.

Let U = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }, A = { 1, 2, 3, 4}, B = { 2, 4, 6, 8 } and C = { 3, 4, 5, 6 }. Find (B – C)′

Let U={1, 2, 3, 4, 5, 6, 7, 8, 9 } A = {1, 2, 3, 4} B = { 2, 4, 6, 8} C = { 3, 4, 5, 6 } Find (A ∪ C)′