What is the difference between an atom in the ground state and an atom in an excited state

If you throw a 0.25-kg ball with a force of 20 n, what's the acceleration of the ball? a. 80 m/s2 b. 12.5 m/s2 c. 5 m/s2 d. 40 m/s2

A 65-N box rest on a perfectly smooth surface. The minimum force needed to start the box moving is A) 65 N B) 6.5 N C) 650 N D) any horizontal force greater than zero

LAns: 4.16 hrs) A boy rides motorbike with velocity of 20 m/s. He accelerates his motorbike to a velocity of 30 m/s for 5 second. Calculate the acceleration produced in the motorbike.

Is energy absorbed or given off when an electron and a hole of a semi-conductor crystal recombine? What are the forms of energy that can be absorbed or given off?

A machinist is required to manufacture a circular metal disk with area 1900 cm2. (a) What radius produces such a disk? (Round your answer to four decimal places.) What value of ε is given?

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is pulled A. gravity pulls very hard on the milk carton. B. the milk carton has very little weight. C. the milk carton has inertia. D.

What is concave mirror

Two boxes are suspended from a rope over a pulley. each box has weight 50 n. what is the tension in the rope

What happens when you put a galvanized zinc nail in copper solution for an hour? Does is rust or turn different color? What is the outcome? What happens after an hour in vinegar?

Psuedopod in a sentence