Railroad cars are loosely coupled so that there is a noticeable time delay from the time the first car is moved until the last cars are moved from rest by the locomotive. … The loose coupling enables a longer time for the entire train to gain momentum, requiring less force of the locomotive wheels against the track.
Why do Mountaineers use nylon ropes for climbing the mountains?
Nylon is used for making ropes for rock climbing and parachutes because it possesses tough material. Explanation: Nylon is very strong and light fibre. That’s why they are used for making ropes for rock climbing and parachutes.
Why is a padded dashboard in a car safer than a rigid metal one?
A padded dashboard in a car is safer than a rigid metal one. Airbags save lives. To catch a fast-moving ball, extend your hand forward and move it backward after making contact with the ball.
Would it be safe to fire a gun that has a bullet that is 10 times more massive than the gun itself discuss and defend your answer?
Explain. No. The gun would recoil with a speed ten times the muzzle velocity. Firing such a gun in the conventional way would not be a good idea.
Why do padded dashboards and airbags make cars safer?
Padded dashboards make automobiles safer because they increase the time taken to decrease the momentum of an impacting body to zero, which decreases the impact. Thus, the force acting on the padded dashboards is small.
Why nylon is preferred to make parachutes or climbing ropes?
Nylon is used for making ropes for rock climbing and parachutes because it possesses tough material . nylon is a very strong and light fibre. That’s why they are used for making ropes for rock climbing and parachutes…
Why nylon is used for making parachutes and climbing ropes list some of its properties?
Nylon fibre is so strong to make nylon parachutes and ropes for rock climbing because nylon is used as a synthetic substitution for silk based products. Nylons have some of the features that make it very strong to use for various purposes. It has strength, elasticity, availability, minimum cost value, etc.
Why nylon is used for making parachutes?
nylon is used for making parachute because it is a strong and lightweight this fibre is even Stronger Than a Steel wire of comparible size.
Which exerts the greater impulse on a steel plate?
The machine gun bullets that bounce from the plate exerts a greater impulse force on the steel plate. This is true because impulse= force*time, and the more time from the bouncing bullet reversing its direction contributes to a higher impulse.
What forms of potential and kinetic energy play in a role in the skater’s movement as he skates from the highest point to the lowest point and back?
Potential Energy is the energy stored in an object because of its position. Kinetic Energy is the energy of motion. As the skateboard rolls down the ramp it loses potential energy and gains kinetic energy. The total energy of the skateboarder remains constant.
Which has the greater change in momentum a 50?
Which has the greater change in momentum, a 50 gram clay ball that strikes a wall at 1 m/s and sticks or a 50 gram superball that strikes a wall at 1 m/s and bounces away from the wall at 8.0 m/s? Explain? The ball that bounces has a GREATER change in momentum being that the numerical value is larger.
Why do you think mountain climbers use nylon rope Brainly?
Answer: AS NYLON ROPES STREACHES , THEY EXERT A FORCE OVER A GREATER TIME SO THAT THE FORCE WILL BE SMALLER THAN WITH A HEMP ROPE WHICH EXERTS A FORCE FOR A SHORTER TIME.
Why are nylon ropes used in climbing physics?
Nylon ropes are used in the sport of rock-climbing for the same reason. … The ropes are made of nylon or similar material because of its ability to stretch. If the rope is capable of stretching upon being pulled taut by the falling climber’s mass, then it will apply a force upon the climber over a longer time period.
How do nylon ropes affect the time of the collision?
As nylon ropes stretch, they exert a force over a greater time so that force will be smaller than with a hemp rope which exerts a force over a shorter time.
Why is nylon used to make parachutes Class 8?
Q6: Why nylon is used for making parachutes and ropes for rock climbing? Ans: Nylon thread is very strong infact it is stronger than steel wire, because of this property of nylon it is used for making parachutes and ropes for rock climbing.
Why is nylon preferred?
Nylon has since become a popular choice, as it has excellent wind resistance, good elasticity, mildew resistance, and is comparatively cheaper. The material is also lightweight and dries quickly. It is resistant to abrasion and chemicals.
What properties make nylon suitable for making tents and ropes?
- Resistant to Abrasion.
- Easy to wash and dry.
- Resists shrinkage and wrinkle.
Is nylon fiber really so strong that we can make nylon parachutes and ropes for rock climbing?
Is nylon fibre really so strong that we can make nylon parachutes and rope for climbing. Yes. Nylon is light, strong and resistant to rips.
Why is impulse important?
A very important application of impulse is improving safety and reducing injuries. In many cases, an object needs to be brought to rest from a certain initial velocity. This means there is a certain specified change in momentum.
How does impulse affect momentum?
The impulse experienced by the object equals the change in momentum of the object. In equation form, F • t = m • Δ v. In a collision, objects experience an impulse; the impulse causes and is equal to the change in momentum. … The collision would change the halfback’s speed and thus his momentum.
Do airbags increase or decrease impulse?
By putting an airbag in the car, a smaller force is exerted over a longer period of time to change the momentum of the driver to a stop. … The force of the brakes is exerted over a small time resulting in a small impulse and a small change in the momentum of the car.
Is it illegal to shoot a gun into the air?
The official charge for firing a weapon in the air is criminal recklessness or recklessly pointing a firearm, Woods said. But if someone is struck by the falling bullet, the consequences could be much worse. “If you seriously injure somebody … you absolutely could be charged with reckless homicide,” Woods said.
Can a roof stop a bullet?
Bullets often lodge in roofs, causing minor damage that requires repair in most cases. Normally, the bullet will penetrate the roof surface through to the roof deck, leaving a hole where water may run into the building and cause a leak.