Question

please answer questions 3-9

He HORIZoRtal what velocity would it need in order to make it to the island? 3. Williamsburg Saving Bank Tower was the tallest building in Brooklyn from 1929 till 2009. It stands at 156 m tall. If you dropped a penny (mass 2.58) from the top of this building, and you measure the penny to have a velocity of 20 m/s just before it hits the ground, how much work was done to the penny by air resistance? 4. Arguably the greatest Brooklyn Dodger pitcher was Sandy Kaufax who could pitch a baseball at 93.2 mph. If Koufax pitched a 145g baseball and 80kg catcher caught it while jumping straight up in the air, what would be the horizontal velocity of the catcher and baseball directly after the catch? 5. The temperature in Brooklyn ranges from an average low in January of 27°F to an average high in July of 70°F. If the Brooklyn Bridge is 1.8km long and made of steel (coefficient of linear expansion12 x 10-6°C) how much does its length change between these two extremes? 6. A small block of mass 0.25kg starts from the rest at position O on the frictionless slide (see fig.). When the block passes the point A, its speed is 1.8 m/s. a) What is the difference in height, h, of point O and point A? b) The block passes the point B which is on the same height as point A. What is the kinetic energy of the block at point B? What is the speed of the block (see problem 6) when it reaches point C? Assume the height H of point B (and also of point A) from point C is 0.5m The string is stretched between two supports that are 1.2 m apart. A standing wave is observed with two nodes (see figure ). The frequency of oscillations is observed to be f# 700Hz. a) What is the speed of the wave? b) Is the standing wave oscillating in fundamental mode? What is the frequency of the fundamental mode on this string? If the density of ice is .90x10kg/m3 and 12% of the iceberg volume is above water: 7. 8. 9, What does it tell us is the density of seawater?

Answer 1

2- S 3-332 J (8o+ .14) 2. ,4ng enanye. S4.cem 2 0-165 m.