A projectile moves down a tube with a velocity of 400. m/s. Calculate the velocity of the normal shock that would precede the projectile. Assume the pressure in the undisturbed air to be 1.00 atm and the temperature to be 25.5 oC. Then determine how fast would the projectile have to be moving in order for the shock velocity to be twice the projectile velocity

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

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?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)