Peter wants to move a cabinet, with a mass of 90 kg ,across the floor. 1.what is the magnitude of static friction force before Peter touches the cabinet?

2.He increases the force to 200N , but tge cabinet does not move. what is the static frictional force?

3. A force of 350N is needed to bring the cabinet into motion. calculate the coefficient of static friction.

4. when Peter continues to push the crate ,he exerts a force of 300N to keep it moving at a constant velocity. calculate the coefficient of kinetic friction.​

Will you chech and finish these for me, because i am stumped with them.

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.