A Split Highway Has a Number of Lanes for Traffic.for
A split highway has a number of lanes for traffic.For traffic going in one direction,the radius for the inside of the curve is half the radius for the outside.One car,car A,travels on the inside while another car of equal mass,car B,travels at equal speed on the outside of the curve.Which statement about resultant forces on the cars is correct?
A)The force on A is half the force on B.
B)The force on B is half the force on A.
C)The force on A is four times the force on B.
D)The force on B is four times the force on A.
E)There is no net resultant force on either as long as they stay on the road while turning.
A race car traveling at 100 m/s enters an unbanked turn of 400 m radius.The coefficient of (static)friction between the tires and the track is 1.1.The track has both an inner and an outer wall.Which statement is correct?
A)The race car will crash into the outer wall.
B)The race car will crash into the inner wall.
C)The car will stay in the center of the track.
D)The car will stay in the center of the track if the driver speeds up.
E)The car would stay in the center of the track if the radius were reduced to 200 m.
A student is sitting on the right side of a school bus when it makes a right turn.We know that the force of gravity acts downwards and a normal force from the seat acts upwards.If the student stays in place when the bus turns,we also know that there must be
A)no other force on the student.
B)a force parallel to the seat directed forward on the student.
C)a force parallel to the seat directed to the left on the student.
D)a force parallel to the seat directed to the right on the student.
E)a force parallel to the seat in a direction between forward and left on the student.
For a plane to be able to fly clockwise in a horizontal circle as seen from above,in addition to exerting a force downwards on the air
A)it must be increasing its speed.
B)it must exert a force on the air that is directed to the plane's left side.
C)it must exert a force on the air that is directed to the plane's right side.
D)it does not need to exert a force: it must only move the wing flaps out.
E)it only needs to deflect the air without exerting any additional force on the air.