BEST PRACTICE Equilibrium

A 10-N beam experiences other forces as shown on the figure. The markings on the beam are of equal distances. Is this beam in equilibrium? If it is in equilibrium, type E on the blank. If it is not in equilibrium, what is the net torque (in newton meter) on the beam at the fulcrum? Express the answer as a whole number. No need to write the units. Write the direction as CW or CCW. (Example: 5 CCW)

A 10-N beam experiences other forces as shown on the figure. The markings on the beam are of equal distances. Is this beam in equilibrium? If it is in equilibrium, type E on the blank. If it is not in equilibrium, what is the net torque (in newton meter) on the beam at the fulcrum? Express the answer as a whole number. No need to write the units. Write the direction as CW or CCW. (Example: 5 CCW)

A 10-N beam experiences other forces as shown on the figure. The markings on the beam are of equal distances. Is this beam in equilibrium? If it is in equilibrium, type E on the blank. If it is not in equilibrium, what is the net torque (in newton meter) on the beam at the fulcrum? Express the answer as a whole number. No need to write the units. Write the direction as CW or CCW. (Example: 5 CCW)

The beam, shown in the figure, is pivoted at its center and is in equilibrium. The markings on the beam are of equal distances. What is the mass (in grams) of the sphere? Express the answer as a whole number. No need to write the units.

A 15-kg child is playing with his 30-kg brother on a seesaw. If the 15-kg child is sitting as shown, and the markings on the seesaw are of equal distances, where from the fulcrum should the brother sit to balance the seesaw? Express the answer in terms of the number of markings from the fulcrum.

A 30-kg boy is playing with his 15-kg twin brothers on a seesaw. If the twins are sitting as shown, and the markings on the seesaw are of equal distances, where from the fulcrum should the brother sit to balance the seesaw? Express the answer in terms of the number of markings from the fulcrum.

A 12.5-kg board, 4.00 m long, is being held up on one end by Ahmed. He calls for help, and Judi responds. What is the least force (in newton) that Judi could exert to lift the board to the horizontal position? Express the answer in 3 significant figures. No need to write the unit.

Ten bags of topsoil, each weighing 175 N, are placed on a 2.43-m-long sheet of wood. They are stacked 0.50 m from one end of the sheet of wood, as shown. Two people lift the sheet of wood, one at each end. Ignoring the weight of the wood, how much force must each person exert?

• 1390 N

• 440 N

• 360 N

• 1310 N