A force is applied to the end of a 2 m long uniform board weighing 50 N in order to keep it horizontal, while it pushes against a wall at the left. If the angle the force makes with the board is 30° in the direction shown, the applied force F is

A uniform rod has a weight of 40 N and a length of 1 m. It is hinged to a wall (at the left end), and held in a horizontal position by a vertical massless string (at the right end). What is the magnitude of the torque exerted by the string about a horizontal axis which passes through the hinge and is perpendicular to the rod?

A uniform rod has a weight of 40 N and a length of 1 m. It is hinged to a wall (at the left end), and held in a horizontal position by a vertical massless string (at the right end). What is the force in the string in the previous question?

A uniform rod has a weight of 40 N and a length of 1 m. It is hinged to a wall (at the left end), and held in a horizontal position by a vertical massless string (at the right end). What is the magnitude of the hinge force?

A uniform rod has a weight of 40 N and a length of 1 m. It is hinged to a wall (at the left end), and held in a horizontal position by a vertical massless string (at the right end). If the string is let go, what will be the initial angular acceleration?

The slope of the straight line shown on the graph is called the

Region A in the above figure is called the

The Region B in the figure in the previous limit is called the

The Point C in the figure is clearly not the

The Point D in the figure is called the

A person with a mass of 80 kg hangs from a trapeze suspended by two elastic cords. The force-stretch properties of the cords are shown in the figure. How far do the cords stretch?

A person with a mass of 80 kg hangs from a trapeze suspended by two elastic cords. The force-stretch properties of the cords are shown in the figure. If the cords are 10 meters long and made of Nylon (E = 5 x 10^{9} N/m^{2}), what is their diameter?

A person with a mass of 80 kg hangs from a trapeze suspended by two elastic cords. The force-stretch properties of the cords are shown in the figure. If the nylon cords have a radius of 6 mm, what is their length?

A person with a mass of 80 kg hangs from a trapeze suspended by two elastic cords. The force-stretch properties of the cords are shown in the figure. If a cord described by the figure has a cross sectional area of .79 square centimeters and is stretched a half of a centimeter when a certain force is applied, what is the stress on it?

The red circle in the above 'movie' represents a person on a ladder. In which frame is the force of friction between the ladder and the ground the least? (There is no friction with the wall.)

The red circle in the above 'movie' represents a person on a ladder. At which points is the ladder most in danger of falling?

The red circle in the above 'movie' represents a person on a ladder. When is the wall force equal in magnitude to the force of friction?

The red circle in the above 'movie' represents a person on a ladder. When is the normal force from the ground a minimum?

The bottom of the ladder is 1.2 m from the wall. What is the magnitude of the torque from the wall force about an axis through the bottom of the ladder?

The bottom of the ladder is 1.2 m from the wall. What is the magnitude of the torque from the red weight 1/3 of the way up the ladder about an axis through the bottom of the ladder?

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