Fred points a toy laser gun at a wall. considering that the frequency of the gun's light is 4.91 × 1014 hertz and that planck’s constant is 6.61 × 10-34 joule·seconds, what is the energy of the laser light?
a) 3.24 × 10-21 joules
b) 4.91 × 1015 joules
c) 2.04 × 10-21 joules
d) 4.92 × 10-18 joules

State the right hand rule of the direction of magnetic field in a conductor carrying current

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

If a simple machine reduces the strength of a force, what must be increased?