1. Jack pushes a box to the left with 3 N, Jill pushes the same box to the right with 3 N. What is the net force? Are these balanced forces?
2. John pulls a wagon to the right with 2 N, Julie helps pull the wagon to the right with 4 N. What is the
net force? Are these balanced forces?
3. One object has a mass of 60 kg, another has a mass of 85 kg, and they are 2 m apart. What is the force
of gravity between these two objects?
4. One object has a mass of 3 kg, another has a mass of 6 kg, and they are 6 m apart. What is the force of
gravity between these two objects?

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).

Identify some abiotic characteristics of the tundra biome.