The 2-m long bar AB with a mass of 2 kg, and of small cross section rotates in a horizontal plane (x-y) about a vertical axis (z) which passes through A. It accelerates uniformly from 20 rev/min to 30 rev/min in 5.0 s. after which the angular velocity remains constant. a) What is the linear velocity of its mid point at the beginning and at t

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Frequency of electromagnetic waves that a radio station is assigned is called

If state law mandates that elevators cannot accelerate more than 2.40 m/s2 or travel faster than 14.8 m/s , what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor? ?