# Quiz 8

### 30 terms by amandafein

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1) 49 N

1) 16 N

### 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? Question options: 1) The race car will crash into the outer wall. 2) The race car will crash into the inner wall. 3) The car will stay in the center of the track. 4) The car will stay in the center of the track if the driver speeds up. 5) The car would stay in the center of the track if the radius were reduced to 200 m.

1) The race car will crash into the outer wall.

1) 0.29 kN

2) 0.50

### 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? Question options: 1) The force on A is half the force on B. 2) The force on B is half the force on A. 3) The force on A is four times the force on B. 4) The force on B is four times the force on A. 5) There is no net resultant force on either as long as they stay on the road while turning.

2) The force on B is half the force on A.

2) 20 N

2) 4.3 kN up

2) 0.34 kN

2) 11 N

2) 1.4 kN

2) 0.64 kN

### 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 Question options: 1) it must be increasing its speed. 2) it must exert a force on the air that is directed to the plane's left side. 3) it must exert a force on the air that is directed to the plane's right side. 4) it does not need to exert a force: it must only move the wing flaps out. 5) it only needs to deflect the air without exerting any additional force on the air.

2) it must exert a force on the air that is directed to the plane's left side.

3) 41 N

3) 0.588

### Two small cylindrical plastic containers with flat bottoms are placed on a turntable that has a smooth flat surface. Canister A is empty; canister B contains lead shot. Each canister is the same distance r from the center. The coefficient of static friction between the canisters and the turntable is ms. When the speed of the turntable is gradually increased, Question options: 1) only the lighter container slides outward off the turntable; the heavier one stays on. 2) only the heavier container slides outward off the turntable; the lighter one stays on. 3) both containers slide off the turntable at the same turntable speed. 4) the lighter container slides inward. 5) the heavier container slides inward.

3) both containers slide off the turntable at the same turntable speed.

### A hornet circles around a pop can at constant speed once per second in a path with a 12-cm diameter. We can conclude that the hornet's wings must push on the air with force components that are Question options: 1) straight down. 2) down and inwards. 3) down and outwards. 4) down and backwards. 5) down, inwards and backwards.

3) down and outwards

### When a car goes around a circular curve on a level road, Question options: 1) no frictional force is needed because the car simply follows the road. 2) the frictional force of the road on the car increases when the car's speed decreases. 3) the frictional force of the road on the car increases when the car's speed increases. 4) the frictional force of the road on the car increases when the car moves to the outside of the curve. 5) there is no net frictional force because the road and the car exert equal and opposite forces on each other.

3) the frictional force of the road on the car increases when the car's speed increases.

### An iceboat is traveling in a circle on the ice. Halfway around the circle the sail and the steering mechanism fall off the boat. Which statement is correct? Question options: 1) The boat will continue traveling in the circle because there is no friction. 2) The boat will continue to travel in the circle because its velocity exerts a force on it. 3) The boat will move off on a line tangent to the circle because there is no force on it. 4) The boat will move off tangent to the circle because there is a force on it perpendicular to the boat directed to the outside of the circle. 5) The boat will move off to the outside perpendicular to the tangent line since a force directed to the outside of the circle always acts on the boat.

3) The boat will move off on a line tangent to the circle because there is no force on it.

3) 3.1 N

### A car enters a level, unbanked semi-circular hairpin turn of 100 m radius at a speed of 28 m/s. The coefficient of friction between the tires and the road is m = 0.800. If the car maintains a constant speed of 28 m/s, it will Question options: 1) attempt to dig into the road surface. 2) tend to veer toward the center of the semicircle. 3) arrive safely at the end of the semicircle. 4) tend to veer toward the outside of the circle. 5) veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.

3) arrive safely at the end of the semicircle.

3) 0.22 kN

3) 8.1 N

4) 5.0 kN

### A car enters a level, unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s. The coefficient of friction between the tires and the road is m = 0.25. If the car maintains a constant speed of 40 m/s, it will Question options: 1) attempt to dig into the road surface. 2) tend to veer toward the center of the semicircle. 3) arrive safely at the end of the semicircle. 4) tend to veer toward the outside of the circle. 5) veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.

4) tend to veer toward the outside of the circle.

4) 32

4) 2.00

4) 0.60 kN

### 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 Question options: 1) no other force on the student. 2) a force parallel to the seat directed forward on the student. 3) a force parallel to the seat directed to the left on the student. 4) a force parallel to the seat directed to the right on the student. 5) a force parallel to the seat in a direction between forward and left on the student.

4) a force parallel to the seat directed to the right on the student.

4) 3.7 kN (Up)

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