Two sinusoidal electromagnetic waves of the same angular frequency, ω = 110 rad/s, and oscillating in the same direction are emitted from the same location. the waves are emitted starting at times t1 and t2, respectively, with t2 later than t1 by t2 - t1 = 0.22 s. they are emitted with the same initial phase, φ = 2.1 rad, but have different amplitudes, a1 = 2.4 v/m and a2 = 5.5 v/m, respectively. the time dependence of the waves at their source has the form ei = ai cos(ωt+φ), where t denotes the elapsed time since the start of emission for each wave.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd question 6 options: 3000 joules 30 joules 320 joules 3200 joules

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron