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
fomenos
3 years ago
13

A person bends over to grab a 20 kg object. The back muscle responsible for supporting his upper body weight and the object is l

ocated 2/3 of the way up his back (where it attaches to the spine) and makes an angle of 12 degrees with the spine. His upper body weighs 36 N. What is the tension in the back muscle?
A. 1500 N
B. 1700 N
C. 2700 N
D. 3500 N

Physics
1 answer:
ANTONII [103]3 years ago
4 0

Answer:

C) 2700 N

Explanation:

As per FBD of the given situation we can say that torque due to tension in the spine is counter balanced by the torque due to weight of upper part of the body and the weight of the object

The tension force is acting at an angle of 12 degree

while both weight are acting perpendicular to the length

so here we have

\tau_{clockwise} = \tau_{counterclockwise}

m_1g(\frac{L}{2}) + m_2g(L) = Tsin12(\frac{2L}{3})

now we have

36(9.81)(\frac{L}{2}) + 20(9.81)(L) = T sin12(\frac{2L}{3})

T = 2700 N

You might be interested in
Three resistors of resistances, R1=10Ω, R2=5Ω, R3=20Ω are connected in a circuit in such way that same amount of current flows t
Nezavi [6.7K]

Answer

Explanation:

As the three resistors are connected in series, the expression to be used for the  

calculation of RT equivalent resistance

is:  

RT = R1 + R2 + R3

We replace the data of the statement in the previous expression and it remains:  

5 10 15 RT + R1 + R2 + R3 + +

We perform the mathematical operations that lead us to the result we are looking for:  

RT - 30Ω

5 0
2 years ago
Determine la fuerza aplicada sobre un émbolo en una prensa hidráulica si se quiere cargar una lanza de 2970kg; toma en cuenta qu
Artist 52 [7]
I’m not sure sorry I really wish I could help
4 0
2 years ago
A test car travels in a straight line along the x-axis. The graph in the figure shows the car’s position x as a function of time
svetlana [45]
If it is s-t graph , point is c
if it is v-t graph , point is e
8 0
3 years ago
Read 2 more answers
Cliff divers at Acapulco jump into the sea from a cliff 37.1 m high. At the level of the sea, a rock sticks out a horizontal dis
Stella [2.4K]

Answer:

v_x = 4.87 m/s

Explanation:

Height of the cliff is given as

h = 37.1 m

now the time taken by the diver to hit the surface is given as

h = \frac{1}{2}gt^2

37.1 = \frac{1}{2}(9.8)t^2

t = 2.75 s

Now in the same time it has to cover a distance of 13.39 m

so the speed in horizontal direction is given as

v_x = \frac{x}{t}

v_x = \frac{13.39}{2.75}

v_x = 4.87 m/s

3 0
3 years ago
Aliens Who stay in the country longer than their legally allowed limit are called
IRINA_888 [86]
Illegal immigrants. Yep
8 0
3 years ago
Other questions:
  • Boyle's law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 4l , the press
    12·1 answer
  • Witch of the following is not a function of a simple machine
    13·1 answer
  • The pressure of a gas changes from 120 kPa. The volume changes from 45 L to 40 L. If the initial temperature is 81 c, what is th
    5·1 answer
  • What is the main cause of erosion
    7·2 answers
  • Consider a cylinder initially filled with 9.33 10-4 m3 of ideal gas at atmospheric pressure. An external force is applied to slo
    14·1 answer
  • You have a pick-up truck that weighed 4,000 pounds when it was new. you are modifying it to increase its ground clearance. when
    10·2 answers
  • If the resistance in a circuit remains constant, what happens to the electric power when the current increases?
    9·2 answers
  • 2.1kilograms into grams (1000g=1kg)
    14·1 answer
  • Please,,,,,,,,,,,,,,,,,,,
    12·1 answer
  • When someone asked you if you have a special talent.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!