Do electromagnetic waves travel through a medium

Density of some metals Aluminum - 2.75 g mL Magnesium - 1.74 g mL Nickel - 8.80 g mL Tin - 7.28 g mL Roni picks up a sample of a silver, cylindrical-shaped piece of an unknown metal and is told by her teacher to find the identity of it.

How can the strength of an electromagnet's field be decreased? A. by decreasing the number of loops in the solenoid B. by winding the coils more tightly C. by using a stronger ferromagnetic material for the core D.

An astronaut weighs 104 newtons on the moon where the strength of gravity is 1.6 newtons per kilogram whatbis the mass

Two astronauts are 2.30 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves.

Why mirrors show texts in reverse order?

On his fishing trip Justin takes the boat 25 km south. The fish aren't biting so he goes 10 km west. He follows a school of fish 15 km north. What distance did he cover? What was his displacement?

n open rectangular tank is filled to a depth of 2 m with water (density 1000 kg/m3). On top of the water there is a 1 m deep layer of gasoline (density 700 kg/m3). The width of the tank is 1 m (the direction perpendicular to the paper).

Is the sun considered a star?

If I get a spare in one frame and then roll a 1 and 5 in the next frame, what would my score for the spare be? A 10 B 11 C 16 D17

2x^2:3=dg solve for x