Astudent needs to measure the drag on a prototyped of characteristic length da moving at velocity up in air at sea-level conditions. he constructs a model of characteristic length dm, such that the ratio dpl/dm a factor f. he then measures the model drag under dynamically similar conditions, in sea-level air. the student claims that the drag force on the prototype will be identical to that of the model. is this claim correct? explain.

Multiply the 3 dimensions, assuming it is a rectangular cuboid, to get the volume in cm³ divide mass by volume to get density in g/cm³

Give me some answer choices and i will be happy to

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)

D) the event horizon, a large planet and the chute located between the two.