Two students in a physics laboratory each have a concave mirror with the same radius of curvature, 55 cm. each student places an object in front of a mirror. the image in both mirrors is two times the size of the object. however, when the students compare notes, they find that the object distances are not the same. what is the distance of the closer object?

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

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.

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?