# physics

posted by .

8)If an airplane is moving at a constant velocity of 400 m/s for 20 s, what is its acceleration during this period?

0 m/s^2 b/c no change

10)You try to move a couch across the floor but it doesn't move. What is the other force acting on the couch?

Static friction

11)You finally get the couch in Problem 10 to move, What other force is acting on the couch now?

Kinetic friction

• physics -

correct.

## Similar Questions

1. ### Physics

If an airplane is moving at a constant velocity of 400 m/s for 20 s, what is its acceleration during this period?
2. ### physics

A worker of a moving company places a 308 kg trunk on a piece of carpeting and slides it across the floor at a constant velocity by exerting a horizontal force of 425 N on the trunk. What horizontal force must the mover apply to move …
3. ### Physics

10. You try to move a couch across the floor but it doesn't move. What is the other force acting on the couch?
4. ### physics

The figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.570·mg is then applied at upward angle è = 22°. (a) What is the magnitude of the acceleration of the block across the floor if …
5. ### engineering

an airplane was moving with a velocity equal to 300 mph when the velocity was increased with uniform acceleration to 600 mph in 5 min. calculate the number of miles the airplane traveled during that interval of time
6. ### Physics

A train moving at a constant speed on a surface inclined upward at 10.0° with the horizontal travels a distance of 400 meters in 5 seconds. Calculate the vertical velocity component of the train during this time period.
7. ### Physics

A couch with a mass of 100 kg is placed on an adjustable ramp connected to a truck. When one end of the ramp is raised, the couch begins to move downward. If the couch slides down the ramp with an acceleration of .7 meters per second …
8. ### Physics

If the coefficient of kinetic friction between a 36 kg crate and the floor is 0.31, what horizontal force is required to move the crate at a constant velocity (so that FNET=0.0 N) across the floor?
9. ### Physics

1. To move a large crate across a rough floor, you push on it with a force F at an angle of 21° below the horizontal. The mass of the crate is 32.0 kg. The coefficients of static and kinetic friction are 0.62 and 0.42 respectively. …
10. ### physics

an airplane was moving with a velocity equal to 150 mph when the velocity was increased with uniform acceleration to 300 mph in 5 min. Calculate the number of miles the airplane traveled during that interval

More Similar Questions