 ×     #### Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Click to Chat

1800-1023-196

+91-120-4616500

CART 0

• 0

MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
```
an engine can pull 4 coaches at a maximum speed of 20m/s. mass of the engine is twice the mass of every coach. Assuming resistive forces to be proportional to the weight, approximate maximum speed of the engine when it pulls 12 and 6 coaches are what ?
an engine can pull 4 coaches at a maximum speed of 20m/s. mass of the engine is twice the mass of every coach. Assuming resistive forces to be proportional to the weight, approximate maximum speed of the engine when it pulls 12 and 6 coaches are what ?

```
4 years ago

```							From WET,
(4N + 2N)x = 0.5mv^2
6mgx = mv^2/2 {Resistive force is prop. to  weight}
x = 10/3 meter.
Now for 12 coaches,
(12 + 2)mgx = 0.5mv^2
we get,
v = 30.123 m/s (approx.)
for 6 coaches,
8mgx = 0.5mv^2
v = 23.1245 m/s (approx.)
```
4 years ago
```							Total mass; f is directly proportional to 6m, f=6 (m of coach)20=PTo drive  12m:f is directly proportional to 14m               =>f=14 (mass of coach)                                                                14×mass of coach×v = 6×mass of coach×20       =>v=8.57m/sSimilarly to drive 6 boggies: f is directly proportional to 8mSimilarly calculate P and then v=15m/s
```
3 years ago
```							A/Q   P=k 6mgv----------------(1)  P=k 14mgv1----------------(2)From eqn 1 and 2:- 6mgv=14mgv16v=14v1V1=6×20/14V1=8.5m/s  Also,6mgv=8mgv26v=8v2V2=6×20/8V2=15m/s
```
2 years ago
Think You Can Provide A Better Answer ?

## Other Related Questions on Mechanics

View all Questions »  ### Course Features

• 101 Video Lectures
• Revision Notes
• Previous Year Papers
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Test paper with Video Solution  ### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions