Jack and annie push a cart to the left with forces of 3 n and 4 n, respectively. if the cart is stationary, what is the force of friction? a. 1 n to the left b. 3 n to the right c. 7 n to the right d. 7 n in the positive direction

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

Marcella is a four-year-old girl who is a victim of emotional child abuse. based on the child and family services improvement and innovation act of 2011, which action should the government take for marcella? a. the state should arrest marcella’s abuser. b. the state should find a home for marcella as soon as possible. c. the state should enforce stricter laws in the area where marcella resides. d. the state should provide medical assistance to marcella.