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brodycruce
04.03.2020 •
Physics
Need help pls (projectiles)
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Ответ:
A) 13.13 m (4.13 m above the top of the ramp)
B) 0.92 s, 30.0 m (14.4 m from the top of the ramp)
Explanation:
A)
The motion of the projectile consists of two independent motions:
- A uniform motion along the horizontal direction (constant horizontal velocity)
- A uniformly accelerated motion along the vertical direction (constant downward acceleration)
To find the maximum height, we just analyze the vertical motion.
The initial vertical velocity of the projectile is given by:
Where
u = 18 m/s is the initial velocity
Since this is a uniformly accelerated motion, we can use the following suvat equation:
where:
s is the vertical displacement
Re-arranging, we find s:
However, this is the vertical displacement above the top of the ramp. We see that the ramp is
long in the horizontal direction, so the height of the ramp is
So, the maximum height of the projectile is:
B)
To find the time at which the projectile reaches the maximum height, we use another suvat equation:
where:
Solving for t, we find the time:
The horizontal position of the projectile instead is given by the equation for uniform motion:
where:
Substituting t = 0.92 s, we find:
So, this is the horizontal distance covered from the top of the ramp at the instant of maximum height; and therefore, the horizontal distance from the beginning of the ramp is
Ответ:
actions you would do
Explanation:
Start Your Own Initiative or Volunteer With Environmental Organizations.
Reduce/Recycle Paper.
Recycle More Often.
Save Resources.
Buy Sustainable Products.
Decrease Meat & Dairy Consumption.
Only Buy What You Need