2. in the winter, weather reporters often day "it will be a very cold night because there are no clouds." a. use the sim to see if you can understand why this could be true. b. describe your observations. c. would there be a difference between daytime and nighttime cloud effects

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n