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A car travels up a hill at a constant speed of 65 km/h and returns down the hill at a constant speed of 20 km/h. Calculate the average speed for the round trip.
The drill used by most dentists today is powered by a small air-turbine that can operate at angular speeds of 320000 rpm. How many revolutions does the drill bit make
Under certain conditions, the human body can withstand an acceleration of 10 g's. What is the net force (in Newtons) acting on a person
football player kicks a ball with a speed of 22.1 m/s at an angle of 46° above the horizontal from a distance of 38 m from the goal line. What is the vertical velocity of the ball at the time it reaches the goalpost
A boy of mass 35 kg and a girl of mass 40 kg are skating towards each other with speeds of 2.5 m/s, and 2.0 m/s respectively. Assume that there is no friction, and find their combined velocity after they meet
A hot-air balloon is travelling upwards with a constant speed of 12 m/s. An object fell from the balloon when it was at the height of 1000 m
A ball of mass m is tied to a vertical (Cyclinder) post of radius R. The mass slides on a frictionless, What is the angular momentum of the ball after the string has wrapped once around the post
Create your own 2D kinematics problem and present a detailed solution that includes a sketch. the problem must begin and conclude at different heights, find the maximum height and total time in the air
A small piece of dust of mass m = 1.0 µg travels through an electric air cleaner in which the electric field is 500 N/C, What is the charge on the dust particle
The classroom has a volume of about 100 m3. The pressure is atmospheric and the temperature is 75 ºF. What is the rms speed of the oxygen molecules
What is the minimum cross-sectional area required of a vertical steel cable from which is suspended a 270 kg chandelier, If the cable is 7.5 m long how much does it elongate
An electron is placed in a region with a constant, uniform electric field pointing in the positive x direction. In what direction is the electric force on the electron
A certain car is capable of accelerating at a rate of 0.52 m/s2. How long does it take for this car to go from a speed of 27 mi/h to the speed of 33mi/h.
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