Asmall sphere of mass m = 0.32 g that carries a charge of q = 9.5 × 10−10 c. the sphere is attached to one end of a very thin silk string of length l = 8.75 cm. the other end of the string is attached to a large vertical conducting plate that has a charge density of σ = 30 × 10−6 c/m2. what is the angle that the string makes with the vertical?

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.)

How many times did thomas edison mess up the light bulb

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.