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Lilit [14]
4 years ago
6

HELP PLEASE!!! I'M REALLY BAD AT MECHANICAL ENERGY!!!

Physics
1 answer:
deff fn [24]4 years ago
7 0
Kinetic is something moving and potential is being still

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During a firework display, a shell is shot through the air with an initiak speed of 70 m/s at an angle of 75° above the horizont
ladessa [460]

Answer:

241.24m

Explanation:

The height at which the shell explodes will be at the maximum height. In projectile motion, maximum height formula is expressed as:

H = u²sin²θ/2g

u is the initial speed = 70m/s

θ the angle of launch = 75°

g is the acceleration due to gravity = 9.81m/s²

Substitute the values into the formula and get H

H = 70²(sin75°)/2(9.81)

H = 4900sin75°/19.62

H = 4900*0.9659/19.62

H = 4733.037/19.62

H = 241.24m

Hence the height at which the shell explodes is 241.24m

4 0
3 years ago
What happens to hotter air in the atmosphere?
Ber [7]

B.Warmer air molecules move faster and get farther apart. As they get farther apart, they become less dense and rise.

5 0
3 years ago
Newtons first law states that objects in motion stays in motion until an unbalanced force is acted upon it. what do you think th
EleoNora [17]
Hi Spycn2115


Newton's first law states that objects in motion stay in motion until an unbalanced force is acted upon it is a good fact. When I first personally heard of it in class I had no clue but when I researched it I learned that one good example of this would be those cradle balls and if u swing it, it will keep constantly hitting each other back and fourth over and over until someone grabs it and stops it, so that's what objects in motion stays in motion until an unbalanced force is acted upon it means, because the balls are in motion by moving left to right constantly and its staying in motion by not stopping and that unbalanced force is someone or something maybe hitting it or knocking it over could stop it, balanced means staying still and equal, unbalanced means unstill so moving, the cradle balls are KE and PE, (Kinect and potential energy) because kinetic means moving, so the balls are moving, and potential means stored up, so before u even swing u have the potential energy to swing it different ways before it becomes kinetic. That's one of my favorite examples of Newton's first law and I left you a pic below of cradle balls to help you get the idea.

8 0
3 years ago
HEY CAN YALL HELP ME IN DIS!!
Natasha_Volkova [10]

It might me same volume

5 0
4 years ago
A plane flies horizontally at an altitude of 3 km and passes directly over a tracking telescope on the ground. when the angle of
Lubov Fominskaja [6]
The solution is:tan(θ) = opp / adj tan(θ) = y/x xtan(θ) = y 
Find x:
x = y/tan(θ) 
So x = 3/tan(π/6) 
Perform implicit differentiation to get the equation:
dx/dt * tan(θ) + x * sec²(θ) * dθ/dt = dy/dt 
Since altitude remains the same, dy/dt = 0. Now... 
dx/dt * tan(π/6) + 3/tan(π/6) * sec²(π/4) * -π/4 = 0 
changing the equation, will give us:
dx/dt = [3/tan(π/6) * sec²(π/6) * π/4} / tan(π/6) ≈ 12.83 km/min 
3 0
4 years ago
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