Acannon is rigidly attached to a carriage, which can move along horizontal rails but is connected to a post by a large spring, initially unstretched, of force constant 2 n/m. the cannon fires a 237 kg projectile at a velocity of 170 m/s directed 31.3 â—¦ above the horizontal. 31.3 â—¦ if the mass of the cannon and its carriage is 6475.91 kg, find the recoil velocity of the cannon.

Explanation:

Given

mass of cannon and cart is

Spring constant

mass of Projectile

Launch Velocity of cannon

Launch angle

As the External Force is zero therefore we can conserve momentum

Initially both Projectile and cannon is at rest

Conserving momentum in horizontal direction

i.e. cannon is moving in opposite direction of Projectile

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

that would be because of both gravity and friction. so     c