Two masses are joined by a massless string. a 30-n force applied vertically to the upper mass gives the system a constant [ans : 490 n] [ans : 1.3 × 10−23 m] [ans : 19 cm] [ans : 1.96 ms−2 ] [ans : 680 m] upward acceleration of 3.2 m/ s 2 . if the string tension is 18 n, what are the two masses?

12/13 kg, 18/13 kg

Explanation:

Let the masses are m and m'.

acceleration, a = 3.2 m/s^2

Force, F = 30 N

Tension, T = 18 N

By the diagram, using Newton's second law

F - T - m'g = m' a (1)

T - mg = ma (2)

Substitute the values of F, T and a in equation (1) and equation (2)

30 - 18 = m' (9.8 + 3.2)

12 = 13 m'

m' = 12/ 13 kg

And, 18 = m (9.8 + 3.2)

m = 18/13 kg

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table