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A man is lifting a 210 Newton object. His spine and back are a uniform rod of weight at 320 Newton. The erector spinals muscle is attached at two thirds of the way up his back. The angle between the spine and this muscle is 12.0.
Evaluate what is the tension?
Evaluate what is Compression force?
The wind exerts on a flower the force 0.755 N horizontally to the east. Find the vector torque of the wind force about the base of the stem
An express train passes through a station. It enters with an initial velocity of 22.0 m/s and decelerates at a rate of 0.150 m/s2 as it goes through. How fast is it going when the nose leaves the station
At what energy does an electron become “relativistic”? Think electrons with kinetic energies of 50 eV, 50 keV, and 50 MeV. For each case, compute the momentum of the electron first using the non-relativistic formula for kinetic energy, and then using..
A solenoid 24.0cm long and with a cross-sectional area of 0.600cm^2 contains 420 turns of wire and carries a current of 75.0 A. Calculate the magnetic field in the solenoid
The magnetic field inside a superconducting solenoid is5.10 T. The solenoid has an inner diameterof 6.20 cm and a length of 26.0 cm. Determine the magnetic energy density in the field.
The density of air under standard laboratory conditions is 1.29{\rm kg}/{\rm m}^{3} , and about 20.0\% of that air consists of oxygen. Typically, people breathe about .5 L of air per breath.
a gas is enclosed in a cylinder fitted with a light frictionless piston and maintained at atmospheric pressure. when
The 80-lb boy and 60-lb girl walk towards each other with a constant speed on the 300-lb cart. find the distance the cart has traveled at the instant the boy and girl meet
A worker pushes horizontally on a large crate with a force of 297 N, and the crate is moved 4.8 m. How much work was done.
A spherical concave lens has a focal length of 20cm, and an object is placed 15cm from the lens. estimate of the image distance and give image characteristics
A radio reciever can pick up signals with peak electric fields as weak as 425muV/m. What is the average intensity of such a signal
Animals in cold climates often depend on two layers of insulation: a layer of body fat [of thermal conductivity 0.200W/(m dot K) ] surrounded by a layer of air trapped inside fur or down. We can model a black bear (Ursus americanus) as a sphere 1...
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