A 2.5 kg ball swings in a horizontal circular path at the end of a string. The radius of the circle is 0.6 m and the ball makes 4 revolutions in a second. Calculate the centripetal acceleration of the ball.

Why there is no inductive reactance in dc circuits

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.