Question

These are dssl season 2 questions. Please solve it.

Answer 1

Answer:

Step-by-step explanation:

Given

1. Four people a, b, c and d of masses 7,9,5 and 13 ( in kg) respectively are moving with their respective velocities in the ratio 4:3:5:2. Who will have the highest momentum

Mass of 4 people a,b,c,d will be 7,9,5 and 13 and their velocities are 4,3,5 and 2

We know that  

Momentum ρ = mass x velocity

So momentum for A = 7 x 4 = 28 kg m/s

Momentum for B = 9 x 3 = 27

Momentum for C = 5 x 5 = 25

Momentum for D = 13 x 2 = 26

So person A will have maximum momentum.

Given

2. A submarine, 608 m below sea level, sends a sonar signal to detect an aircraft directly above it. If it receives the signal 10 sec. later, how far is the aircraft from the submarine? (speed of sound in air 340 m/s, speed of sound in seawater= 1520 m/s)

Now time taken for signal to travel from submarine to aircraft will be 10/2 = 5 s

Let a be the distance of aircraft from submarine.

We know that

T = s1/v1 + s1/v2

5 = 608/1520 + (a – 608) / 340

5 -38/95 = a – 608/340

4.6 = a – 608 / 340

a = 1564 + 608

a = 2172 m

So distance of aircraft from submarine is 2172 m

Answer 2

Answer:

7. Answer 19683

Step-by-step explanation:

2. To the power x= 512

X=9

3 to the power 9= 19683