Quick Help: Identical Guns Fired on Earth & Moon | 3 Possible Answers

  • Thread starter Thread starter dominus96
  • Start date Start date
AI Thread Summary
When identical guns fire bullets horizontally from the same height on Earth and the Moon, the bullet on the Moon experiences less gravitational pull, resulting in a longer flight time. Consequently, the horizontal distance traveled by the bullet on the Moon is greater than that on Earth. The bullet on Earth, however, falls faster due to stronger gravity, leading to a shorter flight time. The velocities of the bullets at impact are not the same, as the bullet on the Moon retains more energy due to its longer flight time. Therefore, statements a) and b) are true, while statement c) is false.
dominus96
Messages
51
Reaction score
0

Homework Statement



Identical guns fire identical bullets horizontally at the same speed from the same height above level planes, one on the Earth and one on the Moon. Which of the following three statements is/are true?

a) The flight time is less for the bullet on the Earth.
b) The horizontal distance traveled by the bullet is greater for the Moon.
c) The velocity of the bullets at impact are the same.

I need to pick all the ones that apply. I think b)would be one, but I don't know what else, if any.
 
Physics news on Phys.org
a) Which falls faster?
b) Depends on ans of (a).
c) Which one gains more energy?
 
The one on the moon stays in the air longer because of the much lower gravity, so does that mean both a) and b) are true?
 
Yes.
 
Ok but c) wouldn't be true right?
 
As I asked, where will it gain more energy, if at all?
 
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Back
Top