# physics

posted by .

An airport has runways only 136m long. A small plane must reach a ground speed of 39m/s before it can become airborne.
What average acceleration must the plane's engines provide if it is to take off safely from its airport?

• physics -

Highway safety engineers build soft barriers so that cars hitting them will slow down at a soft rate. A person wearing a safety belt can withstand an acceleration of 300m/s^2.
How thick should barriers be to safely stop a car that hits the barriers at 92.8km/h?

• physics -

V = sqrt(2 a X)
V is the speed that must be attained
a is the acceleration
X is the distance required

Solve for a.

## Similar Questions

1. ### physics

An airport has runways only 132 m long. A small plane must reach a ground speed of 40 m/s before it can become airborne. What average acceleration must the plane’s engines provide if it is to take off safely from its airport?
2. ### physics

An airport has runways only 142 m long. Asmall plane must reach a ground speed of 45 m/s before it can become airborne. What average acceleration must the plane’s engines provide if it is to take off safely from its airport?
3. ### physics

An airplane needs at least 145 meters of runway to take off. If the plane starts from rest and accelerates uniformly to a take-off speed of 170 km/hr then what is its acceleration in meters/second?
4. ### physics

An engineer must design a runway to accommodate airplanes that must reach a ground velocity of 60 m/s before they can take off. These planes are capable of being accelerated uniformly at the rate of 2.1 m/s2. (a) How long will it take …
5. ### physics

A Boeing 787 is initially moving down the runway at 3.0 m/s preparing for takeoff. The pilot pulls on the throttle so that the engines give the plane a constant acceleration of 1.7 m/s2. The plane then travels a distance of 1900 m …
6. ### physics

To take off from the ground, an airplane must reach a sufficiently high speed. The velocity required for the takeoff, the takeoff velocity, depends on several factors, including the weight of the aircraft and the wind velocity. Part …
7. ### phyics

An airport has runways only 184 m long. A small plane must reach a ground speed of 40 m/s before it can become airborne. What average acceleration must the plane’s engines provide if it is to take off safely from its airport?
8. ### Physics

A jet plane has a takeoff speed of Vto=125km/h (34.72 m/s) and it's engines can power it to accelerate with an average acceleration of 5.6 m/s^2. A.) what length of runway will it need to take off safely?
9. ### physics

An airport has runways only 196 m long. A small plane must reach a ground speed of 38 m/s before it can become airborne. What average acceleration must the plane’s engines provide if it is to take off safely from its airport?
10. ### Physics

A plane starts from rest at the end of a runway and requires 200.0 km/h for takeoff . If it takes 30.0 a to reach takeoff speed, what acceleration must the plane's engines provide to get off the runway ?

More Similar Questions