Zoom in on pictures that arent clear

-/2 Points] DETAILS SERCP11 8.3.P.023. MY NOT A person bending forward to lift a load "with his back" (Figure a) rather than "with his knees" can be injured by large forces exerted on the muscles and vertebrae. The spine pivots mainly at the fifth lumbar vertebra, with the principal supporting force provided by the erector spinalis muscle in the back. To see the magnitude of the forces involved, and to unders bending forward to lift a W. = 240-N object. The spine and upper body are represented as a uniform horizontal rod of weight W. = 415 N pivoted at the base of the spine. The erector spinalis muscle, attached at a point two-thirds of the way up the spine, maintains the position of the back. The angle between the spine and this muscle is 12.0. Back muscle Pivot 12.0 W W. b A a) Find the tension in the back muscle. KN (b) Find the compressional force in the spine. (Enter the magnitude.) KN Need Help? Read It [-/5 Points] DETAILS SERCP11 8.3.P.028. MY NOTE A hungry bear weighing 745 N walks out on a beam in an attempt to retrieve a basket of goodies hanging at the end of the beam (see the figure below). The beam is uniform, weighs 200 N, and is 7.00 m long, and it is supported by a wire at an angle of 0 = 60.0. The basket weighs 80.0 N. Goodies (a) Draw a force diagram for the beam. (Submit a file with a maximum size of 1 MB.) |Choose File No file chosen This answer has not been graded yet. b) When the bear is at x = 1.16 m, find the tension in the wire supporting the beam. N When the bear is at x = 1.16 m, find the components of the force exerted by the wall on the left end of the beam. (Assume the positive +x direction is to the right and the positive +y direction is upward. Include the sign of the value in your answer.) IN (c) If the wire can withstand a maximum tension of 875 N, what is the maximum distance the bear can walk before the wire breaks? mA bicyclist starting at rest produces a constant angular acceleration of 1.70 rad/s for wheels that are 33.0 cm in radius. HINT (a) What is the bicycle's linear acceleration (in m/s )? (Enter the magnitude.) m/s2 (b) What is the angular speed of the wheels (in rad/s) when the bicyclist reaches 10.4 m/s? rad/s (c) How many radians have the wheels turned through in that time? rad (d) How far (in m) has the bicycle traveled? m Need Help? Read It Watch It /3 Points] DETAILS SERCP11 7.5.P.033. HINT (a) Find the magnitude of the gravitational force (in N) between a planet with mass 6.00 x 1024 kg and its moon, with mass 2.25 x 1022 kg, if the average distance between their centers is 2.40 x 10 m. (b) What is the moon's acceleration (in m/s2) toward the planet? (Enter the magnitude.) m /s2 (c) What is the planet's acceleration (in m/s2) toward the moon? (Enter the magnitude.) m/s2 Need Help? Read It Watch ItThe International Space Station has a mass of 4.19 x 103 kg and orbits at a radius of 6.79 x 10 m from the center of Earth. Find the gravitational force exerted by Earth on the space station, the space station's gravitational potential energy, and the weight of a 78.3 kg astronaut living inside the station. HINT (a) the gravitational force (in N) exerted by Earth on the space station (Enter the magnitude.) N (b) the space station's gravitational potential energy (in J) (c) the weight (in N) of an 78.3 kg astronaut living inside the station N Need Help? Read It Watch It 3 Points] DETAILS SERCP11 7.5.P.036. After the Sun exhausts its nuclear fuel, its ultimate fate may be to collapse to a white dwarf state. In this state, it would have approximately the same mass as it has now, but its radius would be equal to the radius of the Earth. (a) Calculate the average density of the white dwarf. kg/m3 (b) Calculate the surface free-fall acceleration. m/s (c) Calculate the gravitational potential energy associated with a 5.92-kg object at the surface of the white dwarf. Need Help? Read It 2 Points] DETAILS SERCP11 7.5.P.039. A projectile is fired straight upward from the Earth's surface at the South Pole with an initial speed equal to one third the escape speed. (The radius of the Earth is 6.38 x 105 m.) a) Ignoring air resistance, determine how far from the center of the Earth the projectile travels before stopping momentarily. (b) What is the altitude of the projectile at this instant? m Need Help? Read It[-/13 Points] DETAILS SERCP11 7.5.P.041.MI.SA. This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. Tutorial Exercise A satellite is in a circular orbit around the Earth at an altitude of 3.45 x 105 m. (a) Find the period of the orbit. (b) Find the speed of the satellite. (c) Find the acceleration of Click here to begin! Need Help? Read It [-/2 Points] DETAILS SERCP11 7.5.P.042. An artificial satellite circling the Earth completes each orbit in 150 minutes. (a) Find the altitude of the satellite. m (b) What is the value of g at the location of this satellite? m/s Need Help? Read It -/4 Points] DETAILS SERCP11 8.1.P.005. Calculate the net torque (magnitude and direction) on the beam in the figure below about the following axes. 25 N 130 20 2.0 m 10 N 30 N (a) an axis through O perpendicular to the page magnitude N . m direction ---Select--- (b) an axis through C perpendicular to the page magnitude N . m direction ---Select---[-/1 Points] DETAILS SERCP11 8.3.P.035. MY NOTES The large quadriceps muscle in the upper leg terminates at its lower end in a tendon attached to the upper end of the tibia (see Figure a). The forces on the lower leg when the leg is extended are modeled as in Figure b, where T is the force of 40.0 with the vertical. Assume that the center of gravity of the lower leg is at its center and that the tendon attaches to the lower leg at a point one-fifth of the way down the leg. (Give the magnitude.) leg, and F is the force of gr. tended at an angle 0 Quadriceps Tendon Tibia a 25.09A T b Need Help? Read It