A 20-g bullet moving at 1 000 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?

A bucket of water with total mass 23 kg is attached to a rope, which in turn, is wound around a 0.050-m radius cylinder at the top of a well. A crank with a turning radius of 0.25 m is attached to the end of the cylinder. What minimum force directed perpendicular to the crank handle is required to just raise the bucket? (Assume the rope’s mass is negligible, that cylinder turns on frictionless bearings, and that g = 9.8 m/s2.)

A 50-N crate is pulled up a 5-m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 10 N between the crate and the surface, what is the force applied by the worker?

A 20-N crate starting at rest slides down a rough 5.0-m long ramp, inclined at 25° with the horizontal. 20 J of energy is lost to friction. What will be the speed of the crate at the bottom of the incline?

Adisa pulls a 40-N crate up a 5.0-m long inclined plane at a constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there is a constant force of friction of 10 N between the crate and the surface, what is the net change in potential energy of the crate?

NOTE ON SPELLING Spelling corrections apply to all applicable vocabulary & grammar activities. Each spelling error will result in minus ½ pt. per error. If you are unable to insert an accent mark, you will not lose points.

Comprensión Auditiva; Actividad A A. Escuchar un párrafo: Lo que hace Erika. You will hear a description of what Erika likes to do in her free time. First, read the statements below. Then, based on what you hear, decide if each statement is Cierto (true) or Falso (false). If the information is not mentioned in the passage, select No se menciona (not mentioned). (1 pt. each; 6 pts. total)       1.  Erika tiene mucho tiempo libre durante la semana. 2. Erika prefiere pasar su tiempo libre sola (alone). 3.  Cuando hace mucho calor Erika va a la playa con sus amigos. 4.  Los sándwiches son de jamón y queso. 5. A Erika le gustan las películas románticas. 6. Erika baila salsa.

Gramática; Actividad A A. Los objetos dobles: Las preguntas de los hijos de Tanya. Tanya’s kids ask her questions all day long. First, read their questions below. Then, select the most logical response from the dropdown menu. If a logical answer is not provided, select ninguna de las anteriores. (1 pt. each; 5 pts. total)   MODELO: Mamá, ¿nos lees el libro? a. Sí, se lo leo. b. Sí, nos la leo.    c. No, no les lo leo.      d. No, no te la leo.  g e. ninunga de las anteriores   1. Mamá, ¿me traes los lentes de natación? 2. Mamá, ¿le diste la bolsa al entrenador? 3. Mamá, ¿sabes si le dan un premio al campeón? 4. Mamá, ¿le trajiste una toalla a Jorge? 5. Mamá, ¿te dio mi entrenadora mi raqueta? La dejé ayer en la cancha.  

Which of the following groups is responsible for regulating the financing of campaigns?

What is the proper chemical name for a molecule with the following formula:  C2S? Please type the name.