A student designs a toy car by adding rubber wheels to a box. Attached to the top of the box is a thick paper rectangle. When the paper is aligned with the box (Figure 1), the car covers a long distance when pushed. When the paper is perpendicular to the box (Figure 2), the car covers less distance when given the same push. Why does the toy car cover less distance when the paper is perpendicular to the box?

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

1) estimating temperature to the nearest tenth of a degree

2) estimating the mass of the sample to the nearest tenth of a gram

4) the position of the cups of sand and water under the heat lamp