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Do both question thanks

webassign.net Chris Brown Radio - Now Playing on Pandora )Please Do Both Question Not Just One Of Them Thanks | Chegg.com PHYS 121 HW 4 7. -12 points SerCP10 4.P.009 My Notes Ask Your Teacher As a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force Fexerted by the tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 45.0 kg. If this fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 4.80 m/s after two-thirds of its length has left the surface, assume constant acceleration and determine the following (a) the salmon's acceleration m/s2 upward (b) the magnitude of the force F during this interval Need Help? Read It 8. -3 points SerCP10 4.P.011 My Notes Ask Your Teacher A boat moves through the water with two forces acting on it. One is a 1,875-N forward push by the water on the propeller, and the other is a 1,100-N resistive force due to the water around the bow. (a) What is the acceleration of the 1,200-kg boat? m/s2 (b) If it starts from rest, how far will the boat move in 20.0 s? (c) What will its velocity be at the end ofthat time? m/s Need Help?Read It

Explanation / Answer

7)

Using relation, v^2 = u^2 + 2as

(4.8^2) - (3^2) = 2 x ((2/3) x 1.5) x a

Acceleration, a = 7.02 m/s^2

B)

F = ma + mg = m(a + g) = 45(7.02 + 9.8) = 756.9 N

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