They have to be warm because of the word thermic which means heat
Answer:
a ) 4.5 N.s
b) V =5 m/s
Explanation:
given,
mass of rifle(M) = 0.9 kg
mass of bullet(m) = 6 g = 0.006 kg
velocity of the bullet(v) = 750 m/s
a) momentum of bullet = m × v
= 750 × 0.006
= 4.5 N.s
b) recoil velocity
m × u + M × U = m × v + M × V
0 + 0 = 0.006 × 750 - 0.9 × V
V = 
V =5 m/s
Answer:
145.8m
Explanation:
The toss distance is given by:

Question 4 is true, question 5 is B.
Answer:
Removing some of the books reduced the mass of the box, and less force was needed to push it across the floor.