Choose the statement(s) that is/are true about the ratio \frac{c_p}{c_v} c p c v for a gas? (ii) this ratio is the same for all gases. (ii) this ratio has a value 1.67 for a monatomic gas (iii) this ratio has an approximate value of 1.4 for diatomic gases. (iii) this ratio has a value 8.314\: j. mol^{-1}.k^{-1}

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.