Two boys push horizontally a 30Kg bicycle and it accelerates at 1.5 m/s2. If the sum of opposing force is 40N. What force must they be exerting on it.

A hydrogen atom in a particular orbital angular momentum state is found to have j quantum numbers 7/2 and 9/2. Question 1: What is the letter that labels the value of l for the state? s, p, d, f, g?

While walking to work in Boston shortly after sunrise you notice that the water level in the bay is exceptionally low. Based on this very low low-tide and the dark cloudless sky last night, what is the current phase of the moon

A train starts from rest and accelerates uniformly, until ithas traveled 5.6 km and acquired a velocity of 42 m/s. Thetrain then moves at a constant velocity of 42 m/s for 420 s. The train then slows down uniformly at 0.

Which would be the least effective medium for traveling sound waves?

A puck traveling at 6 m/s in the + x direction hits a wall and bounces back. Right after the collision with the wall it is traveling in the - x direction at 6 m/s.

Which physical quantities has the unit kg·m·s-1?

Can an object travel at the speed of light? Why or why not?

Determine the amount of potential energy of a 5 Newton's book that is moved to three different shelves on a bookcase. The height of the shelves is 1.0 meter, 1.5 meter, and 2.0 meter

Which atom is involved in giving your heart energy to beat? carbon gold oxygen iron

Which of the following is the most accurate statement concerning the properties of matter? a. they can be written as symbols b. they can be observed and measured c. they cannot be tested or verified d. they change with the amount of matter present