How Long is the Validity Period of a Driver's License Test?

Is the Motion of a Car Wheel a Translational Phenomenon?

The movement of the wheel is a rotational phenomenon, while the movement of the car body is a translational phenomenon, involving sliding friction. The ground exerts a frictional force on the outer tire of the wheel, and there is sliding friction between the hub and the wheel set. The principle of a car: The conversion of reciprocating linear motion into rotational motion enables the car to achieve linear translation. The wheel is a rotating component that bears the load between the tire and the axle, usually consisting of two main parts: the wheel cylinder and the spokes. The functions of car wheels include: bearing the entire vehicle's mass and transmitting traction force, braking force, driving torque, and braking torque; cushioning and absorbing shocks and vibrations caused by uneven road surfaces; improving the adhesion performance between the wheel and the ground. A car wheel consists of the wheel hub, the rim, and the connecting part between these two components. Since the wheel is a rotating body, it requires high dimensional accuracy, minimal imbalance, and certain elasticity and rigidity, along with fatigue resistance, lightweight, and good economic efficiency. Additionally, the wheel rim is the part of the wheel where the tire is mounted and supported, and the spokes are the supporting components between the axle and the rim on the wheel. Apart from the aforementioned components, the wheel sometimes also includes the hub.

2

0

Share

What is the speed limit for the 4 lanes on the highway?

On the highway: The first lane: 100-120 km/h (usually dedicated to passenger cars); The second lane: 80-100 km/h; The third lane: 60-100 km/h; The fourth lane: emergency lane. The highway should clearly mark the speed limit for each lane. The maximum speed should not exceed 120 km/h, and the minimum speed should not be lower than 60 km/h. Below are some precautions for driving on the highway: Check the vehicle and plan the route before driving: Before entering the highway, the driver must carefully inspect the overall condition of the vehicle, including whether various fluids are sufficient, whether the battery and lights are functioning properly, whether the brakes are reliable, and whether the tire condition and pressure are normal, etc., to be fully prepared. Try to stay away from large vehicles as much as possible: Many rear-end collisions on the highway are caused by the failure of large trucks to brake in time, often resulting in severe casualties. Additionally, large trucks have massive bodies and large blind spots in their driving vision, making them like "giant beasts" when driving on the highway.

8

3

Share

What is the minimum ground clearance of the Exeed VX?

The minimum ground clearance of the Exeed VX is 240mm. The minimum ground clearance of the Exeed VX refers to the distance between the lowest point (excluding the wheels) and the supporting plane, which indicates the vehicle's ability to pass over obstacles such as rocks and tree stumps without collision. A higher ground clearance generally improves off-road capability, but if the Exeed VX's ground clearance is too high, it may reduce stability at high speeds. The Exeed VX, designed in 2019, has the following body dimensions: length 4970mm, width 1940mm, height 1788mm, and a wheelbase of 2900mm. Typically, sedans have a ground clearance ranging from 110mm to 150mm, while SUVs have a ground clearance between 200mm and 250mm. However, the Exeed VX's ground clearance is not static—it varies depending on the load condition. Therefore, changes in ground clearance should be considered based on the vehicle's load. When selecting a vehicle, ground clearance can be one of the reference factors. The choice should depend on the vehicle's intended use and road conditions. For urban driving on well-paved roads, a lower ground clearance may enhance stability and comfort. For frequent travel on rough or off-road terrains, a higher ground clearance is advisable to avoid underbody scrapes or damage.

12

5

Share

What is the engine speed when the car is running at 120 mph?

When the car is running at 120 mph, the engine speed is generally around 3400 RPM. Below is relevant information about engine speed: Introduction to Engine Speed: The level of engine speed relates to the number of work cycles per unit time or the effective power output of the engine, meaning the effective power varies with different speeds. Therefore, when specifying the effective power of an engine, the corresponding speed must also be indicated. The effective power and its corresponding speed specified on the engine's product label are referred to as the rated power and rated speed, respectively. The operating condition of the engine at rated power and rated speed is called the rated condition. The rated power is not the maximum power the engine can produce; it is the maximum usable limit of effective power determined based on the engine's intended use. For the same engine model, the rated power value may differ depending on its application. Effective torque also varies with engine conditions. Thus, the maximum torque a car engine can output and its corresponding speed are used as indicators to evaluate the engine's dynamic performance. Speed Measurement: Typically, a speed sensor is used, corresponding to the signal teeth on the flywheel, to measure the engine speed.

10

3

Share

At What RPM Should You Shift Gears in a Sedan?

Ordinary cars typically shift gears between 2000 and 3000 RPM, but shifting from first to second gear is often done at a lower RPM, around 2000 RPM or slightly higher. Some engines are designed for low RPM operation, producing relatively high torque and power at lower RPMs. These engines can shift gears at around 2000 RPM or even between 1500 to 1800 RPM. Below is some relevant information about shifting gears: Shifting Up Techniques: The key to smooth upshifting lies in the "acceleration surge" magnitude. The "acceleration surge" distance should be determined by the gear being shifted to—the higher the gear, the longer the "acceleration surge" distance. During the "acceleration surge," the accelerator pedal should be pressed steadily and released quickly at medium speed. Shifting Down Techniques: Release the accelerator pedal, quickly press the clutch pedal, move the gear lever into neutral, then release the clutch pedal. Quickly tap the accelerator pedal with your right foot (adding "empty throttle"), then press the clutch pedal again quickly, move the gear lever into the next lower gear, and release the clutch pedal using the quick-pause-slow technique to allow the car to continue driving in the new gear.

9

0

Share

What are the steps to remove a car's interior headliner?

Car headliner removal mainly involves the following steps: 1. First remove the four door handles. 2. Then remove the front and rear dome lights. 3. Next, pull off the decorative panel at the rear of the headliner. 4. Finally, remove two screws before pulling it down. Additional information: 1. The car headliner is an important component of automotive interiors, serving decorative, sound-absorbing, and heat-insulating functions. 2. In an era increasingly focused on high performance, environmental friendliness, and lightweight design, interior headliners have become a significant factor in vehicle selection, leading to increasingly higher requirements for automotive interior components.

1

3

Share

How Long is the Validity Period of a Driver's License Test?

Is the Motion of a Car Wheel a Translational Phenomenon?

What is the speed limit for the 4 lanes on the highway?

What is the minimum ground clearance of the Exeed VX?

What is the engine speed when the car is running at 120 mph?

At What RPM Should You Shift Gears in a Sedan?

What are the steps to remove a car's interior headliner?

How many temporary license plates can be applied for a new car?

What is the purpose of the cigarette lighter socket?

What are the reasons for a car not cooling?

Why is the dash cam's red light always on?