explain for a rate If an object is launched from the Earth with a spend effects,

Question

explain for a rate

If an object is launched from the Earth with a spend effects, what speed does it have when it gets Moon and other planets; and express the result vg 2vg a simple pendulum of 5. 00 length is pulled out by 60. 0 degree with respected to the vertical and released. How fast is the pendulum bob moving when the angle moving when the angle of the starting with respect to the vertical is 30. 0 degree? 3. 62 m/s 4. 24 m/s 5. 99 m/s 7. 00 m/s It depends on the mass of the bob. It depends on whether the bob is moving down or moving up. a 3. 0 Kg mass is initially moving northward at 15 m/s. Then a force of 15 N, Toward the east, acts on the mass for 4. 0 s. The magnitude of the body's final velocity (at the end of the 4. 0 s) is: 5 m/s 35 m/s 25 m/s 75 m/s 45 m/s 62 m/s

Explanation / Answer

escape velocity =v

or speed =2v

when it reaches the earths atmosphere its energy will be

1/2* m*(2v)^2 - 1/2*m*v^2 = 1/2*mx^2

3v^2 = x^2

x=root(3) v

b)

change in pe is equal to ke

mghsin(60) -mghsin(30) =1/2*m*v^2

2*9.8*5(sin(60)-sin(30)) =v^2

v=5.99m/s

c)

accleration will be = F/m =15/3 =5

v=u+at

v =5*4 =20

resultant wil be (20^2 + 15^2)^(1/2) =25m/s

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