What does a refractory period prevent

when you stretch a spring 13 cm past it's natural length, it excerts a force of 21 N. What is the spring constant of this spring?

Sonia was experimenting with electric charges. She tied two inflated balloons together, held them next to each other, and rubbed both with a piece of wool. What did Sonia observe, and why?

If I punch a wall, what is the Newton's 3rd Law Pair force?

An object with 274 J of GPE is 140cm above the ground. What is its mass?

On a straight road, a truck moves at constant speed 41.1 km/hr and a car moves at constant speed 138 km/hr. at time t = 0, the car is 6.9 km behind the truck. at what time, in minutes, will the car pull alongside the truck?

Newton's Second law of Motion (F = ma) is one of the basis of forces and motion. How is it very similar to his First law and why is finding the acceleration of the system (the main reason we use it) so important to solving physics and real world

You find out that it takes 2 sec. for the swing to complete one cycle. what is the swing's period and frequency?

Can you chemical change or alter DNA

Give an example in which velocity is zero yet acceleration is not.

A 2,537-kg truck moving at 14 m/s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 8 m/s. What was the mass (in kg) of the struck car