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how to teach the science portion in 10 standred

a simple pendulum is 20 cm known

with 2 mm accuracy. The time for

50 oscillations was measured to be

40 s within 1 s resolution. Calculate

the percentage accuracy in the

determination of acceleration due to

gravity ?g? from the above measurement.

Siri Chandana?asked in Physics

If a=2i+3j+4k it's components in yz plane and zx plane are respectively

Q.39. If the displacement of a particle is given by $S=\left(\frac{1}{2}{t}^{2}+4\sqrt{t}\right)$ m then the velocity and acceleration at t = 4s are :

(A) v = 5 m/s and a = 7/8 m/${s}^{2}$

(B) v = 2 m/s and a = 8/7 m/${s}^{2}$

(C) v = 2 m/s and a = 6/7 m/${s}^{2}$

(D) v = 1 m/s and a = 2/3 m/${s}^{2}$

a) weight of a cube

b) height of a cube

C) area of a cube

D) vol of a cube

A)n>?2

B)n2

C)n>1/?2

D)n

Q.35. Angle between the vectors $\left(\hat{i}+\hat{j}\right)and\left(\hat{i}-\hat{j}\right)$ is -

(A) 90$\xb0$

(B) 0$\xb0$

(C) 180$\xb0$

(D) 60$\xb0$

$\mathrm{Q}.\frac{\mathrm{d}}{\mathrm{dx}}\sqrt{\sqrt{\mathrm{x}}+2}\mathrm{is}\mathrm{equal}\mathrm{to}-\phantom{\rule{0ex}{0ex}}\left(1\right)\frac{1}{4\sqrt{\mathrm{x}}\sqrt{\sqrt{\mathrm{x}}+2}}\left(2\right)\frac{1}{4\sqrt{\mathrm{x}}}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{1}{2\sqrt{\sqrt{\mathrm{x}}+2}}\left(4\right)\frac{1}{2\sqrt{\mathrm{x}}}\phantom{\rule{0ex}{0ex}}$