Between two stations a train accelerates uniformly at first

Asked by admin @ 12/08/2021 in Physics viewed by 291 People

between two stations a train accelerates uniformly at first then moves with constant velocity and finally retards uniformly if the ratio of the time taken by 1 ratio 8 ratio 1 and the max speed attained be 60 kmph then what is the average speed over the whole journey

Answered by admin @ 12/08/2021

Let it accelerates with say ‘a’ in time ‘x’ then it reaches a velocity ‘v’ and continues motion for time ‘8x’ abd finally then retards with ‘b’ in time ‘x’.

v = 0 + ax

=> v = ax

=> 60 = ax

=> a = 60/x

And,

0 = v – bx

=> b = 60/x

Distance covered in time of acceleration,

S1 = 0 + ½ at2

=> S1 = ½ ax2 = ½ × 60/x × x2 = 30x

Distance covered while moving with constant velocity is,

S2 = vt = 60 × 8x = 480x

Distance covered in time of retardation,

02 = v2 - 2bS3

=> S3 = 602/(2 × 60/x)

=> S3 = 30x

So, total distance = 30x + 480x + 30x = 540x

Total time = x + 8x + x = 10x

So, average velocity = 540x/10x = 54 km/h

A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is

Asked by maham237 @ 13/01/2021 in Physics viewed by 1210 persons

Mind map for light reflection and refraction class 10

Asked by admin @ 23/08/2021 in Physics viewed by 1151 persons

The african cicada is the world's loudest insect, producing a sound intensity level of 107 db at a distance of 0.50 m. what is the intensity of its sound (in w/m2) as heard by someone standing 3.1 m away? express your answer in watts per meter squared.

Asked by maham237 @ 10/01/2021 in Physics viewed by 1103 persons

A thief runs at a speed of 10m s

Asked by admin @ 23/08/2021 in Physics viewed by 1099 persons

A 5.8 x 10 4 watt elevator motor can lift

Asked by maham237 @ 20/06/2021 in Physics viewed by 1085 persons

Between two stations a train accelerates uniformly at first

Similar Questions

Train two station

Two trains leave a station at the same time

Two toy trains a and b run towards

The first tidal energy station was built in

Two trains a and b of length 400m

A uniform electric field exists between two charged plates

Two trains each having a speed of 30km h

Two large parallel plane sheets have uniform charge densities

Two trains are each 50 m long moving parallel

A train covered a certain distance at uniform speed

Two ends of a train moving with constant acceleration

Two uniform metal rods of length l1 and l2

Two trains a and b of length 400m each

A train covered a distance at a uniform speed

Distance between two stations a and b is 778

Most viewed questions in Physics

Jeevandeep health and physical education std 10 answers pdf

Hc verma physics class 9 solutions of describing motion

How to leave nightmare land answer key

Base area and stability of some objects with different shapes

Which of the following statements about safe lifting are correct

Porous water-absorbing mass of fibers

Absorption of water by filter paper is due to

A composite wire of uniform diameter 3mm

At a distance l 400m from the traffic light

A rocket of mass m is launched straight up with thrust f⃗ thrust.

A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is

Mind map for light reflection and refraction class 10

The african cicada is the world's loudest insect, producing a sound intensity level of 107 db at a distance of 0.50 m. what is the intensity of its sound (in w/m2) as heard by someone standing 3.1 m away? express your answer in watts per meter squared.

A thief runs at a speed of 10m s

A 5.8 x 10 4 watt elevator motor can lift