# Phsics Homework help

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Thread starter 1 year ago
#1
Hi guys, I'm really stuck on these questions please help me find the answers!

During WW1, the German army bombarded Paris with "Big Bertha." Assume Big Bertha fired shells with an initial velocity of 1.1 x 10^3 m/s [ 45 above the horizontal ]
a) how long was each shell airborne, if the launch point was at the same level as the landing point? -answer is 1.6 x 10^2 s
b) Determine the maximum horizontal range of each shell -answer is 1.2 x 10^5 km
c) Determine the maximum height of each shell -answer is 31 km

An astronaut on the Moon where gravity is 1.6 m/s^2 strikes a ball giving it a velocity of 32 m/s [ 35 degrees above the Moon's horizontal ] The ball lands in a crater floor that is 15 m below the level where it was struck. Determine
a) the maximum height of the ball -answer : 1.1 x 10^2 m
b) time of flight -answer is 24s
c) horizontal range -answer is6.2 x 10^2 m
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1 year ago
#2
(Original post by Jih)
Hi guys, I'm really stuck on these questions please help me find the answers!

During WW1, the German army bombarded Paris with "Big Bertha." Assume Big Bertha fired shells with an initial velocity of 1.1 x 10^3 m/s [ 45 above the horizontal ]
a) how long was each shell airborne, if the launch point was at the same level as the landing point? -answer is 1.6 x 10^2 s
b) Determine the maximum horizontal range of each shell -answer is 1.2 x 10^5 km
c) Determine the maximum height of each shell -answer is 31 km

An astronaut on the Moon where gravity is 1.6 m/s^2 strikes a ball giving it a velocity of 32 m/s [ 35 degrees above the Moon's horizontal ] The ball lands in a crater floor that is 15 m below the level where it was struck. Determine
a) the maximum height of the ball -answer : 1.1 x 10^2 m
b) time of flight -answer is 24s
c) horizontal range -answer is6.2 x 10^2 m
Should be SUVAT on the horizontal and vertical components of the motion.

What have you tried, what problems are you having?
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1 year ago
#3
(Original post by Jih)
During WW1, the German army bombarded Paris with "Big Bertha." Assume Big Bertha fired shells with an initial velocity of 1.1 x 10^3 m/s [ 45 above the horizontal ]
a) how long was each shell airborne, if the launch point was at the same level as the landing point? -answer is 1.6 x 10^2 s
b) Determine the maximum horizontal range of each shell -answer is 1.2 x 10^5 km
c) Determine the maximum height of each shell -answer is 31 km
a) Take the vertical component of its velocity. Using SUVAT (you have u, v and a), calculate the time of flight. Make a convention for which direction is positive, and stick to it.
b) Use the horizontal component of its velocity, which doesn't change, and the time of flight from a.
c) SUVAT on the vertical component of its velocity with t=half the time of flight, or v=0.
Last edited by RogerOxon; 1 year ago
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1 year ago
#4
(Original post by Jih)
An astronaut on the Moon where gravity is 1.6 m/s^2 strikes a ball giving it a velocity of 32 m/s [ 35 degrees above the Moon's horizontal ] The ball lands in a crater floor that is 15 m below the level where it was struck. Determine
a) the maximum height of the ball -answer : 1.1 x 10^2 m
b) time of flight -answer is 24s
c) horizontal range -answer is6.2 x 10^2 m
a) You have v, u, a, and want s
b) You have s (the crater floor), u and a, and want t
c) Horizontal speed is constant, so use the answer from b.
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