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A 72cm wide door is pushed open with a 90 N force applied to the end opposite the hinges. For each of the following, calculate the torque about an axis that passes through the hinges.
(a) The force is applied perpendicular to the face of the door. In N m
(b) The force is applied at 25degrees from the perpendicular to the face of the door, toward the hinges. In N m
(c) The force is applied at 70degrees from the perpendicular to the face of the door, toward the hinges. In N m
(c) The force is applied parallel to the face of the door.
A narrow bar of uniform thickness is 9.1 m long and its mass is 27kg. The bar is supported horizontally from a ceiling by two vertical ropes. One rope is 1.8m from one end of the bar. The second rope is 2.3m from the other end of the bar.
(a) What is the tension in the first rope?In N
(b) What is the tension in the second rope? In N
You sing into a well and find that the well resonates at frequencies of 187 Hz and 221 Hz with no resonances between these two frequencies. What is the depth of the well
Determine the magnitude and direction of the total force on the wire.
A delivery truck from the postal service is traveling with a constant velocity up and interstate entrance ramp with a 8.5 degree slope.a 60-kg box sits on the floor of the truck and as a result of static friction, it does not slide. What is the work ..
A 1000kg car moving 40m/s skids to a stop. During the skid, the only force is the frictional force between the tires and the road, What is the initial kinetic energy of the car
two lenses with focal lengths f15cm and f210cm are located 5cm apart. if an object 2.50 high is located 15.0 cm in
If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by radiation. Estimate the net rate at which your body loses energy by radiation to the night sky under these conditions
Calculate the net work done by the force of friction. A 1.50 m-long, 530 g rope pulls a 7.00 kg block of ice across a horizontal, frictionless surface. The block accelerates at 1.90 {rm m}/{rm s}^{2}. How much force pulls forward on (a) ice (b) rop..
a wire is carrying a current in the -x direction. What is the direction of the uniform magnetic field such that the magnetic force is maximized
When you blow air on the log, its temperature rises from 800°C to 900°C. How much thermal radiation does it emit now?
If the Young's Modulus of the material is made from is 310 MN/m^2 what is the effective spring constant of the cord for stresses and strains where Young's Modulus is valid
0.80 m and the mass of the particle the bob at the end of the cable is 0.24 kg. the pendulum is pulled away from its
Calculate the net torque about point O for the two forces applied as in the figure below. The rod and both forces are in the plane of the page. Assume that F1 = 7.50N and F2 = 10.0N
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