A parachutist, whose weight (actually mass) is , drops from a helicopter
above the ground. She falls towards the earth under the influence of gravity. Assume that the gravitational force is constant. Assume that the force due to air resistance is proportional to the velocity of the parachutist. The proportionality constant is
when the parachute is closed, and is
when it is open. If the parachute does not open until
after the parachutist leaves the helicopter, after how many seconds will she hit the ground?
b) A projectile is fixed with a constant speed v at two different angles of projection and
such that it gives the same range. Show that
Let downward direction be taken as positive. The mass of the parachutist is (m=64) kg. The gravitational force is (mg=64\times 9.8=627.2) N. The resistive force is proportional to velocity and acts upward, so its magnitude is (kv). While the parachute is closed ((k_1=16) kg/s), the equation of motion is [ m\frac{dv}{dt}=mg-k_1 v. ] This is a first-order linear equation. Solving with the initial condition (v(0)=0), [ v(t)=\frac{mg}{k_1}\left(1-e^{-(k_1/m)t}\right). ] Here (\frac{mg}{k_1}=\frac{627.2}{16}=39.2) m/s and (\frac{k_1}{m}=\frac{16}{64}=0.25\ \text{s}^{-1}). Hence [ v(t)=39.2\left(1-e^{-0.25t}\right). ] The distance fallen in the __________ ____ ___ __________ __________.
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एक प्रक्षेप्य को दो अलग-अलग प्रक्षेप कोणों और
पर एक अचर चाल v से इस तरह नियत कर दिया गया कि इससे समान परास प्राप्त हो। दिखाइए कि
State two real-world problems where you think that mathematical modelling is the only approach to find the solution of the problem. Give 4 essentials for each of the problems. Why do you think that there is no other scientific alternative for the treatment of these problems.
b) Classify the following into linear and non-linear models, justifying your classification.
i) Simple harmonic motion for small amplitude of oscillation.
ii) Population growth model given by
iii) Equation for velocity v of a particle at any time t, moving with a constant acceleration a, and initial velocity u.
iv) Equation describing dynamic stability of market equilibrium price given by
$
and pt is the price in period t.
द्रव्यमान M वाला एक कण केन्द्र से दूरी A से विरामावस्था से प्रारंभ करके आकर्षण-केन्द्र की ओर एक सरल रेखा में गतिमान होता है। केन्द्र से दूरी X पर इसका वेग 
के अनुसार परिवर्तित करता है। बल-नियम ज्ञात कीजिए।
For a given set of securities, all their portfolios lie on or within the boundary of the region shown in Fig.1.
In the feasible region, find a portfolio which has maximum return. Also, find a portfolio in this region which has minimum risk.
b) Explain the method of delineating the efficient frontier of a feasible region.
c) Given all the portfolios of n securities what criterion would an investor use to select a good portfolio?
Consider a one-dimensional growth c(x, t) of phytoplankton in a water mass. Formulate the model describing the dynamics of growth taking into account the following: D, its diffusion coefficient, r its rate of growth, R its mortality rate due to sinking. Fixing the area of interest as and the initial concentration of phytoplankton as
, find the concentration distribution of phytoplankton in
at any time t.
b) When an aeroplane ascends from take-off to an altitude of , by how much does the gravitational attraction acting on it decrease?
एक ट्यूमर पर विकिरण (रेडिएशन) उपचार का प्रभाव जबकि उपचार थोड़े समय के लिए परंतु नियमित अंतराल पर किया गया हो।
अपने वर्गीकरण की पुष्टि करते हुए निम्नलिखित को रैखिक और अरैखिक निदर्शों में वर्गीकृत कीजिए
I) लघुदोलन आयाम वाली सरल आवर्त गति
III) किसी समय पर अचर त्वरण और प्रारंभिक वेग यू से गतिमान एक कण के वेग का समीकरण