1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
coldgirl [10]
3 years ago
13

) a box weighing 77.0 n rests on a table. a rope tied to the box runs vertically upward over a pulley and a weight is hung from

the other end (fig. 4â45). determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs (a) 30.0 n, (b) 60.0 n, and (c) 90.0 n.

Physics
1 answer:
sineoko [7]3 years ago
8 0
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.

You might be interested in
Water flows at 0.850 m/s from a hot water heater, through a 450-kPa pressure regulator. The pressure in the pipe supplying an up
grin007 [14]

Answer:

The velocity is  v_2= 0.45 \ m/s

Explanation:

From the question we are told that

      The initial speed of the hot water is  v_1 = 0.85 \ m/s

     The pressure from the heater  P_1  =  450 \ KPa = 450 *10^{3} \ Pa

      The height of the hot water before flowing is  h_1 = 0 \ m

      The height of bathtub above the heater is h_2  =  3.70 \ m

       The pressure in the pipe is P_2 =  414 KPa = 414 *10^{3} \ Pa

       The density of water is \rho =  1000 \ kg/m^3

Apply Bernoulli equation

      P_1 + \rho gh_1 +\frac{1}{2} \rho v_1^2  =  \rho g h_2 + \frac{1}{2}\rho v_2 ^2

Substituting values

     (450 *10^{3}) + (1000 * 9.8 * 0) + (0.5 * 1000 * 0.85^2)  =  (1000 * *9.8*3.70) + (0.5*1000*v_2^2 )

=>   v_2^2 =  \frac{ (450 *10^{3}) + (1000 * 9.8 *0 ) + (0.5 * 1000 * 0.85^2) -[ (1000 * *9.8*3.70) ]}{0.5*1000}

=>   v_2= \sqrt{ \frac{ (450 *10^{3}) + (1000 * 9.8 * 0) + (0.5 * 1000 * 0.85^2) -[ (1000 * *9.8*3.70) ]}{0.5*1000}}

=>    v_2= 0.45 \ m/s

4 0
3 years ago
Help me please !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Vitek1552 [10]
C, due to stuff and whatnot
4 0
3 years ago
Read 2 more answers
A cosmic ray muon with mass mμ = 1.88 ✕ 10−28 kg impacting the Earth's atmosphere slows down in proportion to the amount of matt
anyanavicka [17]

Answer:

a. the magnitude of the force experienced by the muon is 2.55 × 10⁻¹⁹N

b.  this force compare to the weight of the muon; the force is 1.38 × 10⁸ greater than muon

Explanation:

F= ma

v²=u² -2aS

(1.56 ✕ 10⁶)²=(2.40 ✕ 10⁶)²-2a(1220)

a=1.36×10⁹m/s²

recall

F=ma

F = 1.88 ✕ 10⁻²⁸ kg × 1.36×10⁹m/s²

F= 2.55 × 10⁻¹⁹N

the magnitude of the force experienced by the muon is 2.55 × 10⁻¹⁹N

b.  this force compare to the weight of the muon

F/mg= 2.55 × 10⁻¹⁹/ (1.88 ✕ 10⁻²⁸ × 9.8)

= 1.38 × 10⁸

6 0
3 years ago
What are chemical properties
natta225 [31]
Cacu. H2SO.chemical properties related to the used in chemical property
3 0
3 years ago
Read 2 more answers
A bullet travels at 850 m/s. how long will it take a bullet to go 1 km?
Dmitrij [34]
The speed of bullet =
850 m/s

Distance given = 1 km = 1000m

S = D/t
t • S = D/t • t
St = D
St/S = D/S
t = D/S
t = 1000m/850m/s
t = 1.176 s

It will take the bullet 1.176 or about 1.18 seconds to go 1 km.
8 0
3 years ago
Other questions:
  • Draw the lewis dot structure for the ion scn−. (carbon is the central atom.) how many lone pairs of electrons are in this struct
    15·1 answer
  • Which component can assist in a safe stop in the event of a power outage in a pneumatic system?
    12·1 answer
  • A train travels with a constant speed of 20.0m/s for 7.00s. Determine all
    8·1 answer
  • The electric force between two charged balloons is 0.12 newtons. If the distance between the two balloons is halved, what will b
    9·2 answers
  • Calculate the momentum pelephant of a 2140 kg elephant charging a hunter at a speed of 7.63 m/s . pelephant= kg⋅m/s Compare the
    13·1 answer
  • Which metal is liquid at room temperature?
    5·2 answers
  • Determine the orbits period of the moon when the distance between the earth and the moon is 3.82 x 10 to the power of 8
    5·2 answers
  • Question: An increased number of rod cells increase the ability to see, A. during the day B. at night C. underwater or D. colors
    7·2 answers
  • weathering can be either chemical or physical process that action of water causes physical weathering rocks which examples
    6·1 answer
  • determine the longest wavelength of light required to remove an electron from a sample of potassium metal, if the binding energy
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!