A horizontal electric field causes the charged ball to hang at a 15o angle from the vertical. The ball weighs 3.0 g and carries 20 nC charge. It is hanged vertically by a non-conducting string of 60 cm length. The ball is attached to a spring which extends horizontally when the ball moves in the electric field. The spring is plastic, so it does not discharge the ball, has a spring constant 0.050 N/m, What is the electric field strength

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j