Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
When you bend over, a series of large muscles, the erector spinae, pull on your spine to hold you up. (Figure) shows a simplified model of the spine as a rod of length L that pivots at its lower end. In this model, the center of gravity of the 340N weight of the upper torso is at the center of the spine. The 160N weight of the head and arms acts at the top of the spine. The erector spinae muscles are modeled as a single muscle that acts at an 12o angle to the spine. Suppose the person in (Figure) bends over to an angle of 30o from the horizontal.
Part A
What is the tension in the erector muscle? Hint: Align your x-axis with the axis of the spine. Express your answer to two significant figures and include the apporpriate units.
Part B
A force from the pelvic girdle acts on the base of the spine. What is the component of this force in the direction of the spine? (This large force is the cause of many back injuries). Express your answer to two significant figures and include the appropriate units.
A small rocket is fired in a test range. It rises high into the air and soon runs out of fuel. What is the maximum altitude of the rocket
Maricru slides a 60.0-kg crate up an inclined ramp that is2.0-m longg and attached to a platform 1.0 m above floor level... A400.0-N force parrallel to the ramp, is needed to slide the crateup the ramp at a constant speed.
A car starts from rest and travels for 5.0 s with a uniform acceleration of +1.8 m/s2. How fast is the car going at the end of the braking period
a trailer truck enters a 2 percent uphill grade traveling at 72 kmh and reaches a speed of 108 kmh in 300 m. the cab
2 hollow conducting cylindrical shells (radius of 1 cm and 2 cm). The inner cylinder carries a current of 5 A outwards. what is the magnitude of the magnetic field at radius of 2.5 cm
A 1.0 kg hollow ball with a radius of 0.08 m, filled with air, isreleased from rest at the bottom of a 2.2 m deep pool of water. How high above the water does the ball shoot upward
Imagine a proton at rest a certain distance from a negatively charged plate. After being released it collides by the plate. Then imagine an electron at rest the same distance from a positively charged plate. Suppose that the amount of net charge of t..
A bullet of mass mb is fired horizontally with speed v1 at a wooden block of mass mw resting on a frictionless table. The bullet hits the block and becomes completely embedded within it. After the bullet has come to rest within the block, the bloc..
a laser having an internal loss per round-trip of 0.015 when pumped at three times threshold has an output power of 4w.
An internal explosion breaks an object, initially at rest, into two pieces. One piece (m1) is 2 times more massive than the other (m2). find how much kinetic energy did each piece get
only two forces act on an object that is sitting on a flat horizontal surface. the mass of the object is 3.00 kg. force
question two large parallel plates are separated by 0.90cm and carry uniform charge densities equal in magnitude and
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd