For some purposes a photon—a quantum of electromagnetic radiation can be treated as a classical electromagnetic wave train with energy au = ħw, where ħ is planck's reduced constant and w is the angular frequency of the wave. photons are circularly polarized. a. in einstein's mechanics the mass m of a particle of energy eand momentum p is given by the relation e? - p²c2 = m4, where c is the speed of light in vacuum. calculate the mass of the photon, defined in this way. b. the spin quantum number s of a particle is its spin angular momentum s divided by planck's reduced constant ħ. calculate the spin quantum number of the photon, thus defined

To travel at constant speed, a car engine provides 24kw of useful power. the driving force on the car is 600n. at what speed does it travel?

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

Consider a production line with five stations. station 1 can produce a unit in 9 minutes. station 2 can produce a unit in 10 minutes. station 3 has two identical machines, each of which can process a unit in 12 minutes (each unit only needs to be processed on one of the two machines. station 4 can produce a unit in 5 minutes. station 5 can produce a unit in 8 minutes. which station is the bottleneck station?