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Average acceleration

Hi. Here's my problem: "A tennis ball with a speed of 11.8 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 8.51 m/s. If the ball is in contact with the wall for 0.00175 s, what is the average acceleration of the ball while it is in contact with the

Force applied to an object of mass produces acceleration; what is the value?

Please help with the following problem. A force F applied to an object of mass m1 produces an acceleration of 3.00m/s^2. The same force applied to a second object of mass m2 produces an acceleration of 1.00m/s^2. (a) What is the value of m1/m2?.........I understand that a2/a1=1/3 --answer (b) If m1 and m2 were combine

Newton's Laws: Wedge and block mass, magnitude, acceleration

A.) A wedge with mass M rests on a frictionless horizontal tabletop. A block with mass m is placed on the wedge. There is no friction between the block and the wedge. The system is released from rest. Calculate: i) the acceleration of the wedge ii) the horizontal and vertical components of the acceleration of the block.

Magnitude and Greatest Coordinates Acceleration

A radar station detects an airplane approaching directly from the east. At first observation, the range to the plane is 360 m at 40 degrees above the horizon. The airplane is tracked for another 123 degrees in the vertical east-west plane. The range at final contact being 790 m. Find the displacement of the airplane during the p

A person and cage are suspended from pulley; Find force exerted on rope

A man sitting in a cage is connected to a pulley system of three movable and one fixed pulley in the system shown in ATTACHMENT #1. He pulls down on a rope as shown, to raise himself and the cage. The man and cage have a total weight of 639 nt. Ignore friction as negligible. PART a. Find the force he exerts to move upward

Working with a buoyant force on a balloon.

A balloon is descending with a constant acceleration "a" less than 'g' weight of the balloon with the basket and the contents is W. What weight m of the basket should be released so that the balloon will begin to accelerate upwards with constant acceleration 'a' ? Neglect air resistance.

Physics Net torque: angular acceleration of cylinder caused by descending mass.

See attached file. Mass m= 8 kg is suspended from a cord which passes over a frictionless pulley then wraps tengentially on the surface of a uniform cylinder, mass M= 12 kg radius R = .66 m, on a plane inclined at angle b= 25 degrees from horizontal. As the suspended mass descends it gives angular acceleration A to the cylind

Working with centripetal acceleration and force.

A child is twirling a 0.0120 kg ball on a string in a horizontal circle whose radius is 0.100 m. The ball travels once around the circle in 0.500 s. (a) Determine the centripetal force acting on the ball. (b) If the speed is doubled, does the centripetal force double? If not, by what factor does the centripetal force incre

Coefficient of kinetic friction

During a hockey game, a puck is given an initial speed of 12.00 m/s. It slides 54.00 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?


Shown from the top view are six blocks that are sitting at rest on rotating turntables. All of the turntables have the same rotation rate (i.e. same frequency). The masses of the blocks and how far out from the center they sit varies. The specific values are given in the figures. Which of the following statements are true abo

Working with circular motion and centripetal acceleration.

There is a hand held device with a rod with a cord attached to a spring scale on the rod. You swing the ball around in a horizontal circle with a radius of 0.500 m. There are several parts to this that I need help with. If the speed of the ball is 3.7 m/s, how do you calculate the expected tension in the cord? Why can't you s