The 10 lb block has an initial velocity of 10 ft/s on the smooth plane. if a force f= (2.5t) lb, where t is in seconds, acts on the block for 3s, determine the final velocity of the block and the distance the block travels during this time

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is transformed ⇒ as it changes into other forms of energy.

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

Most short-period comets do not have randomly oriented orbits because