A standard issue service pistol is the Beretta M9. It fires a 9 mm diameter round that has a mass of 8 gr. The standard muzzle velocity is 360 m/s. The
barrel is 12.7 cm long.
1. How long does the bullet take in seconds) to travel through the barrel
after it is fired?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

What is the mass of the same rock on the earth

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.