A car enters a horizontal curved roadbed of radius 50

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4.A car enters a horizontal, curved roadbed of radius 50 m.The coefficient of staticfriction between the tires and the roadbed is 0.20.What is the maximum speed withwhich the car can safely negotiate the unbanked curve?A)5 m/s0.60 Nμ=0.20,R=50.0 mB)10 m/sC)20 m/sD)40 m/sE)100 m/sA block of massmis released from rest at a heightRabovea horizontal surface.The acceleration due to gravity isgThe block slides along the inside of a frictionless circularhoop of radius5.Which one of the following expressions gives the speedof the mass at the bottom of the hoop?.R2)R6.For the mass in the problem above, what is the magnitude of the normal force exertedon the block by the hoop when the block reaches the bottom of the hoop?R7.A string is tied to a doorknob 0.72 m fromthe hinge as illustrated in the figure.At theinstant shown, the force applied to the string is5.0 N.What is the magnitude of the torque on thedoor?mmmmE)0.60 Nμ=0.20,R=50.0 mmF!=mg;Ff=μF!;maC=mv2r;mv2R=μF!=μmg"v=μgR=0.20(9.8 m/s2)(50m)=10 m/s
PHY231 Section 1, Form AMarch 22, 20128.In which one of the following situations is zero net work done?A)A ball rolls down an inclined plane.B)A physics student stretches a spring.C)A projectile falls toward the surface of Earth.D)A box is pulled across a rough floor at constant velocity.E)A child pulls a toy across a rough surface causing it to accelerate.
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