Q1. A man wants to install a surveillance mirror in his shop, which mirror should he use?(1) a) Convex mirror

b) Concave mirror

c) Plane mirror

d) Both (a) and (b)

In science and physics what is the standard unit of measure for speed?

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.

The brightest star in the night sky in the northern hemisphere is sirius. its distance from earth is estimated to be 8.7 light years. a light year is the distance light travels in one year. light travels at a speed of 3.00 × 108 m/s. calculate the distance from earth to sirius in miles. (1 mi = 5280 ft) g