Will give brainliest and 50 points!
paul made a diagram to compare and contrast radio waves that are used for communication and for broadcasting.

which labels belong in the areas marked x, y, and z?

x: may use lf, hf, and uhf waves
y: travels at the speed of light
z: may use mf and vhf waves
x: travels at the speed of light
y: may use lf, hf, and uhf waves
z: may use mf and vhf waves
x: may use mf and vhf waves
y: may use lf, hf, and uhf waves
z: uses radio waves with long wavelengths
x: uses radio waves with long wavelengths
y: may use lf, hf, and uhf waves
z: may use mf and hf waves

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 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. a) what is the block's initial mechanical energy? 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.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n