Un corredor dotado de movimiento uniforme lleva una velocidad de 5 m/seg, ¿que distancia recorrerá en un cuarto de hora? Un ciclista lleva movimiento uniforme y recorre una pista de 100 metros en 10 seg. ¿Cuál es su velocidad? El sonido se propaga en el aire con una velocidad de 340 m /seg. ¿Qué tiempo tardará en escucharse el disparo de un cañón situado a 17 km De distancia? La velocidad de la luz es de 300.000 km / seg. Calcular el tiempo empleado por un rayo luminoso en recorrer el globo terrestre cuya longitud es de 40.000.000 metros. Una mesa de billar tiene 10 metros de largo, ¿Qué velocidad debe dársele a una bola en un extremo para que vaya hasta el otro extremo y regrese en 10 seg? Un cuerpo se mueve con una velocidad de 12 km/ min. Calcular la distancia que recorre en 4 seg.

Since the investigative question has two variables, you need to focus on each one separately. thinking only about the first part of the question, mass, what might be a hypothesis that would illustrate the relationship between mass and kinetic energy? use the format of "if…then…because…” when writing your hypothesis.

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative