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A man pushes a 2.0 kg broom at constant speed across thefloor. The broom handle makes a 50 degree angle with thefloor. He pushes the broom with a 5.0 N force.
a) What is the value of the normal force?
b) What is the value of the frictional force opposingthe motion?
c) Suppose he hits a slippery part of the flor and thefrictional force on the broom is suddently reduced to zero. Find the accleration of the broom.
a men holding a 10-kg block by a cord designed to withstand a tension of 150 n steps into an elevator. when the
collectible coins are sometimes plated with gold to enhance their beauty and value. consider a commemorative
A photon with wavelength 0.02585 nm strikes a free electron that is initially at rest. find the kinetic energy of the electron after the collision
For saving energy, bicycling and walking are far more efficient means of transportation than is travel by automobile. For example, when riding at 11.0 mi/h, Find the fuel economy in equivalent miles per gallon for a person walking
A 4.25g bullet traveling horizontally with a velocity of magnitude 375m/s is fired into a wooden block with mass 1.10kg , How fast is the block moving just after the bullet emerges from it
A protostar has a temperature of 3000 K,radius of 2*10^8 km at stage 4. At stage 6, Calculate the star's change in absolute magnitude as it evolves from stage 4 to stage 6
A straight wire having a length of 14.0 m is bent to form a square. If the wire carries a current of 20.0 A, what is the magnitude of the magnetic field at the center of the square
When a car is traveling at 25 m/s on level ground, the stoppingdistance is found to be 22m. This distance is measured by pushinghard on the brakes so that the wheels skid on the pavement.
A box slides across a frictionless floor with an initial speed v = 2.5 m/s. It encounters a rough region where the coefficient of friction is µk = 0.1. find the shortest length of rough floor which will stop the box
An aircraft weighing 849 N is accelerated at 7 m/s/s for 13 seconds, at which time the aircraft launches. How much work was done on the aircraft
a 1200 kg cannon fires a 100.0 kg cannonball at 35 ms. what is the recoil velocity of the cannon? assume that
At the same instant that you fire a bullet horizontally from agun, you drop a bullet from the height of the barrel. which bullet hits the ground first.Explain
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