2YHK 6. A 4.00-kg block rests between the floor and a 3.00- kg block as shown in the figure. The 3.00-kg block is tied to a wall by a horizontal rope. If the coefficient of static friction is 0.800 between each pair of surfaces in contact, what horizontal force F must be 3.00 kg F = ? 4.00 kg applied to the 4.00-kg block to make it move? Ans 78.4 N 7. Two blocks are connected by a string that goes over an ideal pulley as shown in the figure. Block A has a mass of 3.00 kg and can slide over a rough plane inclined 30.0° to the horizontal. The coefficient of kinetic friction between block A and the plane is 30.0° 0.400. Block B has a mass of 2.77 kg. What is the 16 acceleration of the blocks? Ans: 0.392 m/s. boe 8. Engineers are designing a curved section of a highway. If the radius of curvature of the curve is 194 m at what angle should the curve be banked so that a car traveling at 29.0 m/s will stay on the road without the aid of frictional forces? ANS 23.9°. 1.0 m 9. The figure shows two wires that are tied to a 710 g mass that o.50 m

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.