Why is glass a good insulator?(1 point) The atoms in glass hold on tightly to their negatively charged particles.

The atoms in glass do not hold on tightly to their positively charged particles.

The atoms in glass do not hold on tightly to their negatively charged particles.

The atoms in glass hold on tightly to their positively charged particles.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.