PLS MERITNATION EXPERTS ANSWER THESE QUESTIONS IN DETAIL FAST AS MY SCIENCE PAPER IS ON 24TH OF FEB 1 - Science -

Question

PLS MERITNATION EXPERTS ANSWER THESE QUESTIONS IN DETAIL FAST AS
MY SCIENCE PAPER IS ON 24TH OF FEB
1 A rocket of mass 3x10^6 kg takes off from a launching pad
and acquires a vertical velocity of 1km/s at an altitude of 25km
calculate the amount of energy dissipated (g=10m/s^2)
2

A 18g bullet moving at 775m/s strikes a target and penetrates
horizontally a distance of 12 2cm before stopping find the average
retarding force exerted on the bullet by the target
3 A bullet of mass 50g travelling with a velocity of 600m/s has
its velocity reduced to 150 m/s in passing through a target
calculate the amount of energy dissipated
4 Two bodies of equal mass move with velocities v and 3v
respectively find the ratio of their knetic energy

nitish.gupta · Accepted Answer

(4)

Hi,

Given:

$m_{1} = m_{2} = m v_{1} = v; v_{2} = 3 v \frac{K_{1}}{K_{2}} = \frac{\frac{1}{2} m v^{2}}{\frac{1}{2} m (3 v)^{2}} = \frac{1}{9}$

So the ratio between the kinetic energies of two bodies is 1:9.

Please refer to the study material for rest of the questions.