Two cars of different masses use similar tires. If they are moving with same initialvelocity then the minimum stopping distance(s)- a) is less for the lighter car b) are equal for both the cars c) is less for the heavier car d) none of these

Q57. Density of a solid cylinder is 850 kg/m

^{3}. If it floats in vertical position in water then the percentage of volume of cylinder outside the water is(A) 15 (B) 20

(C) 25 (D) 85

Q59 A block of mass 3 kg is placed on a rough surface as shown in the figure. The coefficient of static friction between the two surfaces is 0.2 then find the minimum horizontal force 'F' required to move the block.

(A) 0.6 N (B) 6.44 N

(C) 5.88 N (D) 2. 94 N

$54Asoundwavetravelsfromnorthtosouth,inwhichdirectiondotheparticlesofairmove\phantom{\rule{0ex}{0ex}}A)East-west\phantom{\rule{0ex}{0ex}}B)North-south\phantom{\rule{0ex}{0ex}}C)upanddown\phantom{\rule{0ex}{0ex}}D)noneofthese$

(A) 2 $\times {10}^{-11}N$ (B) 1.2 $\times {10}^{-11}N$

(C) 2.2 $\times {10}^{-11}N$ (D) 0.934 $\times {10}^{-11}N$

(E) None of these

Two cars of different masses use similar tires. If they are moving with same initialvelocity then the minimum stopping distance(s)-

a) is less for the lighter car

b) are equal for both the cars

c) is less for the heavier car

d) none of these

a) m2/m1*a2

b) m1m2a2

c) m1/m2*a2

d)(m1+m2)a2