What is the solvent in air

The majority component is the solvent so In the air nitrogen is found more.

So Nitrogen is the solvent in air.

the compression of the spring is 0.5613 m

Explanation:

Given;

mass of bullet, m₁ = 0.01 kg

mass of block, m₂ = 1.65 kg

initial velocity of the block, u₂ = 0

initial velocity of the bullet before hitting the block, u₁ = 300 m/s

Final speed of the bullet-block system after collision, v = ?

spring constant, K = 17.2 N/m

Apply the principle of conservation of linear momentum;

m₁u₁ + m₂u₂ = v( m₁ + m₂)

0.01 x 300 + 1.65 x 0 = v(0.01 + 1.65)

3 = 1.66v

v = 3 / 1.66

v = 1.807 m/s

Apply the principle of conservation of mechanical energy to determine the compression of the spring;

KE₁ + PE₁ = KE₂ + PE₂

¹/₂mu² + ¹/₂Kx₁² = ¹/₂mv² + ¹/₂Kx₂²

where;

m is mass of bullet and block embedded together

u is the initial velocity of the  bullet-block system = 1.807 m/s

v is the final velocity of the  bullet-block system = 0

x₁ is the initial compression of the spring = 0

x₂ is the final compression of the spring = ?

¹/₂(1.65 + 0.01) (1.807)² + ¹/₂(17.2)(0)² = ¹/₂(1.65 + ).01)(0)² + ¹/₂(17.2)(x₂)²

2.71 + 0 = 0 + 8.6(x₂)²

(x₂)² = 2.71 / 8.6

(x₂)² = 0.3151

x₂ = √0.3151

x₂ = 0.5613 m

Therefore, the compression of the spring is 0.5613 m