# physics

posted by .

A cannon ﬁres a 0.639 kg shell with initial
velocity vi = 10 m/s in the direction θ = 55

above the horizontal.
The shell’s trajectory curves downward because of gravity, so at the time t = 0.217 s
the shell is below the straight line by some
vertical distance ∆h.
Find this distance ∆h in the absence of
air resistance. The acceleration of gravity is
9.8 m/s
2
.

• physics -

Mistake: it has to be “above the straight line”

Δh=vₒ(y) •t-gt²/2= vₒ•sinα•t- gt²/2=
=10•sin55•0.217 – 9.8•0.217²/2 =
= 1.78 – 0.23 =1.55 m

## Similar Questions

1. ### physics

A cannon fires a shell at an angle of 55.0° above the horizontal. The shell has a mass of 17.5 kg, and its initial speed as it leaves the cannon is 289 m/s. The cannon is not anchored to the ground. It is mounted on a base—a large …
2. ### Physics

A cannon is rigidly attached to a carriage,which can move along horizontal rails but is connected to a post by a large spring, initially unstretched, of force constant 60000 N/m. The cannon ﬁres a 305 kg projectile at a velocity …
3. ### physics

The shell’s trajectory curves downward because of gravity, so at the time t = 0.217 s the shell is below the straight line by some vertical distance ∆h. Find this distance ∆h in the absence of air resistance. The acceleration …
4. ### physics

A shell is ﬁred from the ground with an initial speed of 1.70 × 10 3 m/s (approximately ﬁve times the speed of sound) at an initial angle of 70.0 ◦ to the horizontal. The acceleration of gravity is 9.81 m/s 2 . …
5. ### physics

A toy cannon fires a .11 kg shell with initial velocity vi=10m/s in the direction 52 degrees above the horizontal. The shell's trajectory curves downward because of gravity, so that time t=.61 s the shell is below the straight line …
6. ### Physics

An artillery shell is ﬁred at an angle of 75.7 above the horizontal ground with an initial speed of 1720 m/s. The acceleration of gravity is 9.8 m/s^2. Find the total time of ﬂight of the shell,neglecting air resistance. …
7. ### physics

An artillery shell is fired at an angle of 86◦ above the horizontal ground with an initial speed of 1630 m/s. The acceleration of gravity is 9.8 m/s 2 . Find the total time of flight of the shell, neglecting air resistance. Answer …
8. ### physics

A cannon fires a 0.598 kg shell with initial velocity 10 m/s in the direction 46◦ above the horizontal. The shell’s trajectory curves downward be- cause of gravity, so at the time t = 0.53 s the shell is below the straight …
9. ### Physics

An artillery shell is fired at an angle of 67.4◦ above the horizontal ground with an initial speed of 1860 m/s. The acceleration of gravity is 9.8 m/s2 . Find the total time of flight of the shell, neglecting air resistance. …
10. ### Physics

10. A military jet flies horizontally with a velocity of 450 m/s and 20,000 m above the ground. When the jet is straight above an artillery gun a shell is fired. Assuming the shell hits the jet. a. Calculate the horizontal component …

More Similar Questions