Refer to the diagram shown below.
T = the tension in the rope
N = the the normal reaction (the force that the table exerts on the box)
W = the hanging weight
Assume that the pulley is frictionless.
For equilibrium,
T = W
and
T + N = 77
Therefore
N = 77 - W
(a) When W = 30 N,
N = 77 - 30 = 47 n
Answer: 47 N
(b) When W = 60 N,
N = 77 - 60 = 17 N
Answer: 17 N
(c) When W = 90 N
N = 77 - 90 = - 13 N
There is no normal reaction, and the system is no longer in equilibrium.
Instead, the box will be lifted by a force of 13 N, and the box will accelerate upward.
Answer:
1.55
Explanation:
that it is the standard refractive index.
–9.8 m/s<span>2
Just took it and got it right!</span>
The sound waves travel because of the pitch of the note so the window rattles.
Answer:
77.35 m / s
Ф = -17° from + X axis or 343° from + X axis
Explanation:
v1 = 75 m/s 25° east of north
v2 = 100 m/s 25° east of south
Write the velocities in vector form ,we get


Now add the velocity vectors to get the resultant of the velocities.



magnitude of resultant velocity is 
= 77.35 m / s
The direction is Ф from X axis

Ф = -17° from + X axis or 343° from + X axis