Tuesday
November 25, 2014

Posts by mayrel


Total # Posts: 8

physics
box full of books rests on a wooden floor. The normal force the floor exerts on the box is 235 N. a) You push horizontally on the box with a force of 121 N, but it refuses to budge. What can you say about the coefficient of static friction between the box and the floor? (b) ...
February 17, 2011

physics
While trying to decide where to hang a framed picture, you press it against the wall to keep it from falling. The picture weights 9.5 N and you press against the frame with a force of 19 N at an angle of 30° from the vertical. What is the coefficient of static friction ...
February 17, 2011

physics
A pulley is attached to the ceiling (as shown in the figure below). Spring scale A is attached to the wall and a rope runs horizontally from it and over the pulley. The same rope is then attached to spring scale B. On the other side of scale B hangs an W = 75-N weight. What ...
February 17, 2011

physics
The drawing below shows an elastic cord attached to two back teeth and stretched across a front tooth. The purpose of this arrangement is to apply a force to the front tooth. (The figure has been simplified by running the cord straight from the front tooth to the back teeth.) ...
February 17, 2011

physics
A crow sits on a clothesline midway between two poles as shown. Each end of the rope makes an angle of θ = 21° below the horizontal where it connects to the pole. If the combined weight of the crow and the rope is 8.3 N, what is the tension in the rope?
February 17, 2011

physics
A large wooden crate is pushed along a smooth, frictionless surface by a force of 87 N. The acceleration of the crate is measured to be 2.0 m/s2. What is the mass of the crate?
February 17, 2011

physics
A barge is hauled along a straight-line section of canal by two horses harnessed to tow ropes and walking along the tow paths on either side of the canal. Each horse pulls with a force of 700 N at an angle of 10° with the centerline of the canal. What is the net force on ...
February 17, 2011

physics
You are pulling a suitcase through the airport at a constant speed. The handle of the suitcase makes an angle of 34.4° with respect to the horizontal direction. If you pull with a force of 30.0 N parallel to the handle, what is the force of friction acting on the suitcase?
February 17, 2011

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