Object O stands on the central axis of a spherical mirror. For this situation object distance is ps = +22 cm, the type of mirror is concave, and then the distance between the focal point and the mirror is 40 cm (without proper sign). Find: a. the radius of curvature r (including sign)
b. the image distance i
c. the lateral magnification m. Also, determine whether the image is (d) real or virtual.
e. inverted from object O or noninverted, and (f) on the same side of the mirror as O or on the opposite side.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.