1.An object that weighs 50-N is in free fall.
a. What is the net force on this freely falling object?
b. What is the net force when the object encounters 15 N of air resistance?
c. What is the net force when it falls fast enough to encounter 50 N of air resistance?
2.The force of friction acting on a sliding crate is 120 N.
a. How much force must be applied to maintain a constant velocity?
b. What will be the net force acting on the crate?
c. What will be the acceleration?
3.A 15.9-kg mass on a horizontal friction-free air track is accelerated by a string attached to another 15.9-kg mass hanging vertically from a pulley as shown above. The masses are connected by a string, and move together as one unit.
(a)Since the track is frictionless, the weight of the hanging mass is the only force acting to accelerate the masses. What is their acceleration?
(b)Suppose the mass on the table is 7.95 kg, and the hanging mass is 31.8 kg. What is their acceleration? thx :]
2007-10-11 13:19:21 · 1 answers · asked by thinktank 2 in Science & Mathematics ➔ Physics
1. Good for the object
a. 50N
b. 35N
c. 0 N
2. Great!
a. 120N
b. F and its magnitude is ...Your guess is as good as my.
what is the angle, coefficient of friction...
c. a=F/m
3. Atwood's again?
see ref
2007-10-14 05:53:13 · answer #1 · answered by Edward 7 · 0⤊ 0⤋