During a maneuver in space, a space craft separates into two pieces, each of mass m. before the separation, the spacecraft was moving with a speed v. if one of the pieces is at rest after the separation, which one of the following statements concerning this maneuver is true?
a) this maneuver conserves kinetic energy. b) the maneuver does not conserve total energy. c) this maneuver does not conserve momentum. d) if one piece is at rest, the other is moving with a speed 2v. e) one piece cannot be at rest. the must both be moving with a speed v/2.

Select the correct answer from each drop-down menu. compared to its surroundings, the concentration of solutes is low inside a cell. so, the cell is with respect to its surroundings. a particular solute in this cell uses energy for its transport from the cell to its surroundings. this type of transport is called

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?