physics

A uniform wooden plank of length L = 6.0 m and mass M = 90 kg rests on top of two sawhorses separated by D = 1.5 m, located equal distances from the center of the plank. You try to stand on the right-hand end of the plank. If the plank is to remain at rest, how massive can you be?

  1. 👍
  2. 👎
  3. 👁
  1. 90 kg at 1.5 / 2 meters from center of plank exactly balanced your mass m at 3 meters from center
    90 * 1.5 / 2 = m * 3
    45 * 1.5 = 3 m
    m = 22.5 kg

    1. 👍
    2. 👎
    👤
    Damon

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    A book of mass 7 kg rests on a plank. You tilt one end of the plank and slowly increase the angle of the tilt. The coefficient of static friction between the book and the plank is 0.40. What is the maximum angle of tilt for which

  2. physics

    A cat walks along a uniform plank that is 4 m long and has a mass of 7 kg. The plank is supported by two sawhorses, one 0.44 m from the left end of the board and the other 1.5 m from its right end. When the cat reaches the right

  3. PHYSICS 1 ..'''''''''''''''''''''''' helllpppppppp

    A girl of mass (Mg) is standing on a plank of mass (Mp). Both are originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant velocity (vgp) to the right

  4. Physics(Please check)

    A uniform plank of length 5.0 m and weight 225 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 404 N walk on the

  1. physics concepts (please check over my work)

    A uniform cyclinder made of lead has the same mass and the same length as a uniform solid cylinder made of wood. The rotatonal inertia of the lead cylinder compared to the wooden one is: I thought at first that the rotational

  2. physics

    A 62kg person lies flat on uniform plank of mass 15kg.The plank, with the person lying on it,is placed on a brick at the head and a bathroom scale at the foot,both under the plank.The persons toe to head dist is 1.56m.The length

  3. Physic

    A uniform plank of length 3 m is supported by two wooden trestles L and M as shown in the diagram above. L exerts a force of 80n upwards and M a force of 160N upwards. M is O.5m from the centre of gravity of the plank. calculate

  4. physics

    A uniform wooden plank 68cm long and weighing 38N rest horizontaly on two knife edges each 10cm from the ends of the plank. (1) What is the greatest land which applied at one end of the plank will not cause it to over turn. (2)

  1. Science

    In order to weigh a boy in the lab. A uniform plank of wood AB 3m long having a mass of 8kg is pivoted about a point 0.5m from B in order to balance the plank horizontally. Calculate the mass of the boy.

  2. physics

    A uniform plank weighing 50N and 12m long is pivoted at a point of 4m from one end.A boy weighing 30N sits on the plank 7m from pivot.Where must his elder brother whose weight is 80N sit to balance the plank horizontally

  3. physics

    You know that you can safely stand on the hang-over end of a heavy plank that rests on a table. How far depends on your mass and the mass of the plank. Suppose you can stand on the end of a plank that overhangs the edge of the

  4. Physics

    A person carries a plank of wood 2 m long with one hand pushing down on it at one end with a force F1 and the other hand holding it up at 50 cm from the end of the plank with force F2. If the plank has a mass of 20 kg and its

You can view more similar questions or ask a new question.