topic4_3_clickers

2023 Given that G is 6.672 x 10 -11 N m 2 kg -2 , the mass of the moon M is 7.35 x 10 22 kg, and the distance from the moon to the Earth, r, is 3.844 x 10 magnitude of the gravitational force of the moon on 1 kg of water on the Earth? 4.3 Clicker #2 Clicker Question A) 10 -5 N B) 10 -3 N C) 0.1 N D) 10 N E) 1000 N Hint: (6.7) 2 = 45, (7.3) 2 = 53, (3.8) = 14 F gravitational = − GMm r 2 where : G = the gravitational constant M = the mass of body #1 m = the mass of body #2 r = the distance between the bodies F gravitational (7 x 10 -11 N m 2 kg -2 ) (3 x 10 22 kg)(1 kg) (3.8 x 10 8 m) 2 ~ (21 x 10 11 N m 2 ) (14 x 10 16 m 2 ) ~ ~ 10 -5 N ! CLICKER Question

2023 Assuming the moon is directly above the Equator (which we have done so far) the tides are: A. independent of latitude Clicker Question CLICKER Question Fig 3.8 Thomson 1981 (co) f gravitational - F centripetal = TGF l Although the centripetal force (F) is equal everywhere, the gravitational force (f) is not . Because it depends on 1/r 2 it is stronger closer to the moon and weaker away from it. l If the moon is directly above the Equator, the point on the Earth’s surface that is closest to the moon is the Equator. l Here f gravitational is maximum thus the TGF is maximum too ( recall F centripetal is constant everywhere ).

2023 The spring-neap cycle is: A. almost independent of latitude B. largest at the North and South poles C. largest near the Equator D. largest at the North pole E. largest at the South pole 4.3 Clicker #4 Clicker Question Fig 3.12 Thomson 1981 (co) The spring-neap cycle depends on the relative positions of the Sun and moon à independent of latitude on Earth. CLICKER Question

2023 4.3 Clicker #5 Clicker Question A B C D Below is a plot of the tides (surface height) and the tidal currents at a certain place. The most mixing probably occurs at: E CLICKER Question