Which of these systems is NOT an ""isolated system"" to which conservation of momentum can be applied?1. A billiard ball collides with another billiard ball on a level pool table. (Ignore friction with the table during the instant of the collision.) System: the two balls2. A ball falls freely toward the ground. (Ignore air friction.) System: the ball and the earth3. All of these in fact are isolated systems.4. A single car slips on an icy road. (Friction with the ice is negligible.) System: the car5. Two cars slipping on an icy road collide with one another. (Friction with the ice is negligible.) System: the two cars6. A ball falls freely toward the floor. (Ignore air friction.) System: the ball7. Two masses connected by a spring oscillate on a frictionless tabletop. System: the two masses and the spring

If you touch a hot light bulb and get burned, that is an example of a. radiation b. convection c. conduction

Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

Observations show that interstellar clouds can have almost any shape and