8. A rock falls off a cliff and hits the ground 5 seconds later.<br />It experiences an acceleration of 10 m/s2.<br />(a) Sketch the speed-time graph for the rock for t = 0 s to t = 5 s.<br />(b) Calculate the height of the cliff.<br />(c) Determine the distance in which the rock fell between the 2nd and 3rd second.​

What do radio waves and microwaves have in common? both are at the side of the spectrum that has the shortest wavelengths. both are at the side of the spectrum that has the lowest radiant energy. both are at the side of the spectrum that has the lowest frequency. both are found next to visible light on the electromagnetic spectrum.

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?