English

The Amount of Pollution Content Added in Air in a City Due to X Diesel Vehicles is Given by P(X) = 0.005x3 + 0.02x2 + 30x. - Mathematics

Advertisements
Advertisements

Question

The amount of pollution content added in air in a city due to x diesel vehicles is given by P(x) = 0.005x3 + 0.02x2 + 30x. Find the marginal increase in pollution content when 3 diesel vehicles are added and write which value is indicated in the above questions ?

Answer in Brief
Sum

Solution

Since, marginal increase in the pollution content is the rate of change of total pollution with respect to the number of diesel vehicles, we have

Marginal increase in pollution = 

\[\frac{d P}{d x} = 0 . 015 x^2 + 0 . 04x + 30\] 
When x = 3, marginal increase in pollution = \[0 . 015\left( 9 \right) + 0 . 04\left( 3 \right) + 30 = 0 . 135 + 0 . 12 + 30 = 30 . 255\]
Hence, the required marginal increase in pollution is 30.255 units.
It indicates the pollution level due to x diesel vehicles.
shaalaa.com
  Is there an error in this question or solution?
Chapter 13: Derivative as a Rate Measurer - Exercise 13.3 [Page 24]

APPEARS IN

RD Sharma Mathematics [English] Class 12
Chapter 13 Derivative as a Rate Measurer
Exercise 13.3 | Q 9 | Page 24

RELATED QUESTIONS

A point source of light is hung 30 feet directly above a straight horizontal path on which a man of 6 feet in height is walking. How fast will the man’s shadow lengthen and how fast will the tip of shadow move when he is walking away from the light at the rate of 100 ft/min.


The volume of a cube is increasing at the rate of 8 cm3/s. How fast is the surface area increasing when the length of an edge is 12 cm?


An edge of a variable cube is increasing at the rate of 3 cm/s. How fast is the volume of the cube increasing when the edge is 10 cm long?


A balloon, which always remains spherical on inflation, is being inflated by pumping in 900 cubic centimetres of gas per second. Find the rate at which the radius of the balloon increases when the radius is 15 cm.


Sand is pouring from a pipe at the rate of 12 cm3/s. The falling sand forms a cone on the ground in such a way that the height of the cone is always one-sixth of the radius of the base. How fast is the height of the sand cone increasing when the height is 4 cm?


The total revenue in rupees received from the sale of x units of a product is given by R(x) = 13x2 + 26x + 15. Find the marginal revenue when x = 7.


The sum of the perimeter of a circle and square is k, where k is some constant. Prove that the sum of their areas is least when the side of square is double the radius of the circle.


Find the rate of change of the area of a circular disc with respect to its circumference when the radius is 3 cm ?


Find the rate of change of the volume of a cone with respect to the radius of its base ?


The total revenue received from the sale of x units of a product is given by R (x) = 13x2 + 26x + 15. Find the marginal revenue when x = 7 ?


The money to be spent for the welfare of the employees of a firm is proportional to the rate of change of its total revenue (Marginal revenue). If the total revenue (in rupees) recieved from the sale of x units of a product is given by R(x) = 3x2 + 36x + 5, find the marginal revenue, when x = 5, and write which value does the question indicate ?


An edge of a variable cube is increasing at the rate of 3 cm per second. How fast is the volume of the cube increasing when the edge is 10 cm long?


The side of a square is increasing at the rate of 0.2 cm/sec. Find the rate of increase of the perimeter of the square.


The radius of a spherical soap bubble is increasing at the rate of 0.2 cm/sec. Find the rate of increase of its surface area, when the radius is 7 cm.


The radius of an air bubble is increasing at the rate of 0.5 cm/sec. At what rate is the volume of the bubble increasing when the radius is 1 cm?


If y = 7x − x3 and x increases at the rate of 4 units per second, how fast is the slope of the curve changing when x = 2?


Find an angle θ whose rate of increase twice is twice the rate of decrease of its cosine ?


A balloon in the form of a right circular cone surmounted by a hemisphere, having a diameter equal to the height of the cone, is being inflated. How fast is its volume changing with respect to its total height h, when h = 9 cm.


The length x of a rectangle is decreasing at the rate of 5 cm/minute and the width y is increasing at the rate of 4 cm/minute. When x = 8 cm and y = 6 cm, find the rates of change of the area of the rectangle.


A circular disc of radius 3 cm is being heated. Due to expansion, its radius increases at the rate of 0.05 cm/sec. Find the rate at which its area is increasing when radius is 3.2 cm.


The side of a square is increasing at the rate of 0.1 cm/sec. Find the rate of increase of its perimeter ?


If the rate of change of volume of a sphere is equal to the rate of change of its radius, find the radius of the sphere ?


If \[V = \frac{4}{3}\pi r^3\] ,  at what rate in cubic units is V increasing when r = 10 and \[\frac{dr}{dt} = 0 . 01\] ?  _________________


The coordinates of the point on the ellipse 16x2 + 9y2 = 400 where the ordinate decreases at the same rate at which the abscissa increases, are


The distance moved by a particle travelling in straight line in t seconds is given by s = 45t + 11t2 − t3. The time taken by the particle to come to rest is


If the rate of change of volume of a sphere is equal to the rate of change of its radius, then its radius is equal to


The diameter of a circle is increasing at the rate of 1 cm/sec. When its radius is π, the rate of increase of its area is


A man 2 metres tall walks away from a lamp post 5 metres height at the rate of 4.8 km/hr. The rate of increase of the length of his shadow is


Evaluate:  `int (x(1+x^2))/(1+x^4)dx`


A ladder 13 m long is leaning against a vertical wall. The bottom of the ladder is dragged away from the wall along the ground at the rate of 2 cm/sec. How fast is the height on the wall decreasing when the foot of the ladder is 5 m away from the wall.


Water is dripping out at a steady rate of 1 cu cm/sec through a tiny hole at the vertex of the conical vessel, whose axis is vertical. When the slant height of water in the vessel is 4 cm, find the rate of decrease of slant height, where the vertical angle of the conical vessel is `pi/6`


The rate of change of volume of a sphere with respect to its surface area, when the radius is 2 cm, is ______.


A kite is moving horizontally at a height of 151.5 meters. If the speed of kite is 10 m/s, how fast is the string being let out; when the kite is 250 m away from the boy who is flying the kite? The height of boy is 1.5 m.


x and y are the sides of two squares such that y = x – x2. Find the rate of change of the area of second square with respect to the area of first square.


What is the rate of change of the area of a circle with respect to its radius when, r = 3 cm


A cylindrical tank of radius 10 feet is being filled with wheat at the rate of 3/4 cubic feet per minute. The then depth of the wheat is increasing at the rate of


An edge of a variable cube is increasing at the rate of 10 cm/sec. How fast will the volume of the cube increase if the edge is 5 cm long? 


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×