# Physics

posted by .

A Knight of the Round Table ﬁres oﬀ a vat of
burning pitch from his catapult at 17 m/s, at
29

above the horizontal.
The acceleration of gravity is 9.8 m/s
2
.
How long is it in the air?

• Physics -

The initial vertical velocity component Vyo determines the time in the air.

Vyo = 17 sin29 = 8.24 m/s

Vy becomes zero at
t = Voy/g = 0.84 s

Double that time to include the time coming back down.

## Similar Questions

1. ### physics

A car is parked near a cliﬀ overlooking the ocean on an incline that makes an angle of 21.7◦ with the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from …
2. ### physics

A 4.2 kg rock is initially at rest at the top of a cliﬀ. Assume that the rock falls into the sea at the foot of the cliﬀ and that its kinetic energy is transferred entirely to the water. How high is the cliﬀ if …
3. ### physics

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 …
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 dart gun is ﬁred while being held horizontally at a height of 1.19 m above ground level, and at rest relative to the ground. The dart from the gun travels a horizontal distance of 3.33 m. A child holds the same gun in a horizontal …
6. ### Physics

A student stands at the edge of a cliﬀ and throws a stone horizontally over the edge with a speed of 10.6 m/s. The cliﬀ is 25 m above a ﬂat, horizontal beach. A.) How long after being released does the stone strike …
7. ### Physics

A dart gun is ﬁred while being held horizontally at a height of 1.52 m above ground level, and at rest relative to the ground. The dart from the gun travels a horizontal distance of 7.81 m. A child holds the same gun in a horizontal …
8. ### Physics

A ﬁreman, 34.9 m away from a burning building, directs a stream jet of water from a ground level ﬁre hose at an angle of 44.2◦ above the horizontal. If the speed of the stream as it leaves the hose is 60.5 m/s, …
9. ### physics

A 3.6 kg rock is initially at rest at the top of a cliﬀ. Assume that the rock falls into the sea at the foot of the cliﬀ and that its kinetic energy is transferred entirely to the water. How high is the cliﬀ if …
10. ### physics

A Knight of the Round Table fires off a vat of burning pitch from his catapult at 17.4 m/s, at 33 ◦ above the horizontal. The acceleration of gravity is 9.8 m/s 2 . How long is it in the air?

More Similar Questions