To start a car engine, the car battery moves 9.80 ✕ 1021 electrons through the starter motor. How many coulombs of charge were moved?

A 11 kg object with a net charge of -2.96 coulombs is moved vertically near the earth's surface where the gravitational field is 9.81 N/kg and the electric field is 70 N/C pointing downwards. If the object stores -55 joules of electric potential energy, how far was it raised or lowered? Assume that up is the positive direction. Express your answer in meters.

Calculate the work that you would have to do to remove the −6 microcoulomb charge (from the current location to a point far away).  Answer in Joules.

A bare helium nucleus has two positive charges and a mass of 6.64 x 10-27 kg. (a) Calculate its kinetic energy in joules at 7.20% of the speed of light. (b) What is this in electron volts? eV (c) What voltage would be needed to obtain this energy? V

A molecule of DNA (deoxyribonucleic acid) is 2.17⁢μm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.00% upon becoming charged. Determine the effective spring constant of the molecule.

A helium-filled balloon with a 14.5 nC charge rises 290 m above Earth’s surface. By how much does the electrical potential energy change if Earth’s electric field is −105 N/C?

The velocity selector shown below allows a 2 µC charged particle to pass through without being deflected as long as its velocity is v = 5,500 m/sec. Which of the following statements are True/False? positive plate X X X X X X X X X X X X X ľo X negative plate X X X If v = 4,500 m/sec, a negative charge deflects left. True If v = 6,500 m/sec, a positive charge deflects right. | True If B is increased, all negative charges with v = 5,500 m/sec deflect left. False Any charged particle traveling at 5,500 m/sec passes through undeflected. True If E is increased, all positive charges with v = 5,500 m/sec deflect right. | True Note: you MUST complete all sentences before submitting.

One type of ink-jet printer, called an electrostatic ink-jet printer, forms the letters by using deflecting electrodes to steer charged ink drops up and down vertically as the ink jet sweeps horizontally across the page. The ink jet forms 35.0 μm-diameter drops of ink, charges them by spraying 800,000 electrons on the surface, and shoots them toward the page with a horizontal velocity of 17.0 m/s. Along the way, the drops pass through the long axis of two horizontal, parallel electrodes that are 6.0 mm long, 4.0 mm wide, and spaced 1.0 mm apart. The distance from the center of the electrodes to the paper is 1.90 cm. To form the letters, which have a maximum height of 6.0 mm, the drops need to be deflected up or down a maximum of 3.0 mm. Ink, which consists of dye particles suspended in alcohol, has a density of 800 kg/m³. 3 E D 80 C $ 4 R 888 F4 F V % 5 FS T ^ G 6 B Part A What electric field strength is needed between the electrodes to achieve this deflection? Express your answer with…

A proton (mass = 1.67 × 10-27 kg, charge = 1.60 × 10-19 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 50 km/s. At point B the speed of the proton is 92.9 km/s. Determine the potential difference VB -VA (in units of А volts). Select one: O A. 24.02 О в. 31.38 Ос. -50.38 O D. -31.99 O E. 2.12

A particle (charge = 3 µC) is released from rest at a point x %3D = 11.4 cm. If a 61.1-µC charge is held fixed at the origin, what is the kinetic energy of the particle after it has moved 94.1 cm? Round your answer to 2 decimal places.