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What is the weight of a standard helmet?

1 Answers

CorbinFitz

07/30/25 1:17am

Small-brim and rolled-edge safety helmets should not exceed 430g (excluding accessories). Large-brim safety helmets should not exceed 460g (excluding accessories). Cold-proof helmets should not exceed 690g (excluding accessories). The helmet shell is hemispherical, sturdy, smooth, and has a certain elasticity, with the impact and puncture energy of striking objects mainly borne by the shell. Introduction to car seat belts: Car seat belts are safety devices designed to restrain occupants during collisions and prevent secondary collisions with the steering wheel, dashboard, etc., or to avoid injuries caused by being ejected from the vehicle during a crash. How car seat belts work: The retractor contains a ratchet mechanism. Normally, occupants can pull the webbing freely and evenly from the seat. However, when the webbing stops being pulled out continuously or when the vehicle encounters an emergency, the ratchet mechanism locks automatically, preventing the webbing from being pulled out further.

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What documents are required for a driver's license medical examination at the hospital?

Required documents include the original ID card and one photocopy. Here are the relevant details: Introduction: Drivers undergoing the medical examination must present their own documents: driver's license (both original and copy). They must carefully and truthfully fill out the driver's review and license renewal application form, attaching one recent one-inch passport-sized photo. Regulations: If a motor vehicle driver's household registration is transferred out of the jurisdiction of the original vehicle management office, they must apply for a license renewal at the vehicle management office in the new jurisdiction. If a motor vehicle driver resides outside the jurisdiction of the issuing vehicle management office, they may apply for a license renewal at the vehicle management office in their place of residence. When applying, the applicant must complete the 'Motor Vehicle Driver's License Application Form' as required and submit the driver's identity proof as well as the motor vehicle driver's license.

Why is the car locked and unable to start?

When a car is locked and unable to start, it indicates the vehicle is equipped with an engine electronic anti-theft system, also known as a transponder-based immobilizer. Its fundamental principle is to lock the car's engine, electrical circuits, and fuel system, preventing the vehicle from starting without a chipped key. A locked car anti-theft system is a common malfunction of vehicle anti-theft devices. Relevant explanations are as follows: 1. The car has an engine electronic anti-theft system, which only allows the vehicle to start when the chip inside the key matches the code in the anti-theft system. 2. The spare key does not contain a chip, hence it cannot start the car. The spare key can only be used to unlock the door when the original key is lost.

What Happens When the Car Fan Control Module Fails?

Turn on the air conditioning to see if it spins. If it doesn't, the fan motor is faulty; if it does, the temperature controller is faulty. Below are the specific control principles of car fans: 1. Thermoswitch "Sole" Control: The high and low speeds of the car fan are "solely" controlled by the thermoswitch. This switch has two gears and is installed on the radiator to detect water temperature. 2. Radiator Control: The car fan is installed behind the radiator and pulls air from the front of the radiator when turned on. However, some models have fans installed in front of the radiator, blowing air toward the radiator when turned on. 3. Engine-Driven: The electric fan does not rotate when the engine is cold but starts spinning as the temperature rises, driven by an electric motor. 4. Fan Control Device: To reduce engine power loss and save fuel, mechanical fans often use a fan control device to engage or disengage the cooling fan from the drive pulley.

What is the method to prevent stalling on a hill start?

The method to prevent stalling on a hill start is: 1. After engaging first gear, first apply throttle by pressing the accelerator until the tachometer reads 1500 to 2000 RPM, then hold your right foot steady; 2. Slowly release the clutch to the bite point, then press it back slightly - meaning just before reaching the actual bite point - and hold your left foot steady while quickly releasing the handbrake; 3. If you notice the car starting to roll backward while releasing the handbrake, gently release the clutch further with your left foot while maintaining throttle between 1500 to 2000 RPM. Additional note: When performing a hill start, remember not to lift the clutch while pressing the accelerator, and lift the clutch slowly - doing it too quickly may cause stalling.

Why Does the Brake Make Noise When Braking?

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Will the car door break if slammed twice?

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