32.) Projectile A Is launched horizontally at a speed of 30 m/s from the top of

Question

32.) Projectile A Is launched horizontally at a speed of 30 m/s from the top of a cif and strikes a level surface below 3 seconds a.) How much time does it take projectile B to reach the level surface? later. Projectile B is launched horizontally from the same location at a speed of 40 m/s. b.) How tall is the ciff 33.) The diagram shows a block on a horizontal frictionless surface. A 100 N force acts on the block at an angle of 30 ° above the horizontal. What is the magnitude of force Fif it establishes equilibrium? BLOCK 34.) The diagram to the right shows a 10 kg mass held at rest on a frictionless 30 incline by force F. What is the approximate magnitude of force F?

Explanation / Answer

From the given question,

32(a) As both projectiles are launched from same vertical height and with same initial vertical velocity ( v=0 m/s, as projected horizontally) , they both will take same time to reach ground.

Time take by B to reach ground= 3 sec

b) (1/2) gt^2 = H

H= (1/2) (9.8) (3^2)

=44.1 m

33) For equilibrium, F=100 cos 30

F=86.6 N

34) For mass to held at rest, F= mg sin30

=10*9.8* sin30

=49 N

F= 5 N

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