In Figure 6-2 the scale at left is attached to the ceiling and a mass of 1.00 kg hangs from it. It reads 9.81 N. The identical scale at the right is connected by perfect strings passing over perfect pulleys to two 1.00 kg masses hanging vertically at the end of the strings. The scale at right reads

A seesaw made of a plank of mass 10.0 kg and length 3.00 m is balanced on a fulcrum 1.00 m from one end of the plank. A 20.0-kg mass rests on the end of the plank nearest the fulcrum

What mass must be on the other end if the plank remains balanced? A) 6.67 kg B) 7.50 kg C) 10.0 kg D) -10.0 kg E) 5.00 kg

The mass enclosed in any orbit can be estimated from the equation M(

A) The mass is distributed like a doughnut, with a hole in the center. B) The mass is concentrated in the center. C) The mass is spread out over large radius. D) Cannot be determined from the information given.

When two point charges are 2.0 cm apart, each one experiences a 1.0-N electric force due to the other charge. If they are moved to a new separation of 8.0 cm, the electric force on each of them is closest to

A) 1.0 N. B) 4.0 N. C) 16 N. D) 0.25 N. E) 0.063 N.

The force on a 0.500-kg particle depends on position such that F(x) = (1.00 N/m2)x2 + ( 4.00 N/m)x for a particle constrained to move along the x-axis

If the particle starts from rest at x = 0.00, what will be its speed when it reaches the position x = 4.00 m? A) 1.65 m/s B) 22.6 m/s C) 14.6 m/s D) 11.3 m/s E) The particle will not reach the position x = 4.00 m.