वह महामारी निदर्श लीजिए जो आदि प्रतिबंध पर
के अधीन निम्नलिखित अवकल समीकरण द्वारा नियंत्रित है :
$
जहां x(t) समय t पर सुग्राह्य व्यक्तियों की संख्या है, संपर्क दर है। ऐसा मान लिया गया है कि जनसंख्या संवृत्त है और लोग समांग रूप से एक दूसरे के साथ मिल-जुलकर रह रहे हैं। मान लीजिए संपर्क दर 0.002 है और सुग्राह्य व्यक्तियों की संख्या प्रारंभ में 5000 है।
i) जनसंख्या का घनत्व ज्ञात कीजिए जब व्यक्तियों के नए रोगी बनने की दर अधिकतम हो।
ii) वह समय (सप्ताहों में) ज्ञात कीजिए जिसमें व्यक्तियों के नए रोगी बनने की दर अधिकतम हो।
iii) नए रोगी बनने की अधिकतम दर प्राप्त कीजिए।
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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
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
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?
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
Consider the cubic total cost function
Assume that the price of q is 15 per unit. Find the output which yields maximum profit.
b) Apply dominance to find the optimum strategies of A and B from the pay-off matrix given below
| Player B | |||
| u | v | ||
| x |
|
| |
| Player A | y |
|
|
| z |
|
| |
A particle moving in S.H.M has got the velocities and
when it is at distance
and
respectively from the centre of its motion. Determine the period and the amplitude of motion.
b) Consider the following system of equations
Find the nature of the critical point (0, 0) of the corresponding linear system.
c) A string of length l is connected to a fixed point at one end and to a stick of mass m at the other. The stick is whirling in a circle at constant velocity v. Use dimensional analysis to find the equation of the force in the string.
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?