During a medieval battle, a catapult placed on a summit throws a tarball at an angle of 27.5◦above the horizontal direction. The tarball’s speed at the top of its trajectory is 43.3 m/s. The tarball then lands at a point on the ground within enemy lines, horizontally 321 m from its launch point, striking an enemy unit. Let us neglect air resistance. (a) How high is the highest point of the tarball’s trajectory, from the launch height? (b) What is the vertical distance between the tarball's launch point and the tarball’s point of a strike at the ground?

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?

How many times did thomas edison mess up the light bulb

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?