A6.0-kg box slides down an inclined plane that slopes 39° to the horizontal. the box accelerates at a rate of 3.1 m/s^2. what is the coefficient of kinetic friction between the box and the surface of the inclined plane?
0.55
0.40
0.16
0.48

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?