(i) A motor cycle and a car is moving with the same velocity. Which of these have more momentum? (ii) A motorcycle and car moving with same momentum. Which of these will have greater speed?

(i) A motor cycle and a car is moving with the same velocity. Whi…

In CGS system, the value of Stefan's constant is $\sigma=5.67 \times 10^{-5} erg s ^{-1} cm^{-2} K^{-4}$. Find its value in SI units. Given $1 J=10^7 erg$.

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An athelete takes 2.0s to reach his maximum speed of 18.0km/h. What is the magnitude of his average acceleration?

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A solid ball of rubber is taken from the surface of a 400 m deep lake to its bottom, then its volume decreases by 0.2 percent. If the density of water is $1.0 \times 10^3 kg / m ^3$, calculate the Bulk's Modulus of elasticity of rubber.

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Each of the resistances shown in figure. has a value of $20\Omega.$ Find the equivalent resistance between A and B. Does it depend on whether the point A or B is at higher potential?

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Find the scalar and vector products of two vectors. $a =(3 \hat{ i }-4 \hat{ j }+5 \hat{ k })$ and $b =(-2 \hat{ i }+\hat{ j }+3 \hat{ k })$

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Draw displacement-time graph for a uniformly accelerated motion. What is its shape?

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Gas thermometers are more sensitive than mercury thermometers. Why?

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Mention some areas in which Physics has contributed to development.

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Two springs $A$ and $B$ are similar in all respects, but spring $A$ is stiffer than $B$, i.e., $K_A>k_B$, on which spring more work will be done if :
(a) both should be drawn to equal length,
(b) both should be pulled with equal force?

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A tightly closed metal lid of a glass bottle can be opened more easily if it is put in hot water for some time. Explain.

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