Homework Statement
When someone ties a string to a ball and swings it in a circular motion is the string doing work on the ball?
Homework Equations
The Attempt at a Solution
Ok I am a little bit lost here it does seem that the tension on the string is doing work on the ball but...
Homework Statement
The take-off speed of a given airplane is 250 mi/h. If the take-off weight is 110,000 Kg, what is average the thrust force exerted by the engines?
Homework Equations
w=mg ,F=ma , F=mW
The Attempt at a Solution
the mi/h confuses me and I don't know which...
Homework Statement
A person that has a weight, on land, of 145 lb gets on an elevator to records an apparent weight of 122 lbs. What is the direction and magnitude of the elevator's acceleration?
Homework Equations
F=ma or F=mW
The Attempt at a Solution
I have no Clue how to...
Homework Statement
The acceleration of a particle is 5 m/s^2. What is the acceleration in Km/hr^2 and ft/hr^2?
Homework Equations
1km=1000m , 1m = 3.28 ft , 1hr=3600s
The Attempt at a Solution
ok so i have answers with calculator which is
5m/s^2 = 64800 km/hr^2 and...
Homework Statement
A car starts from a point and returns to the same point after 160 seconds. During this time the car traveled at an average speed of 10 m/s. What is its displacement? What is its average velocity? Explain your answers using a motion graph (Position - time)
Homework...