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- An object has a charge of 35 nC. How many excess protons does it have?A charge of 36.3 nC is transferred to a neutral copper ball of radius 4.35 cm. The ball is not grounded. The excess electrons spread uniformly on the surface of the ball. What is the number density (number of electrons per unit surface area) of excess electrons on the surface of the ball?The number of electrons needed to go from -1.5 μC to -2.1 μC would be ______________? The charge on an electron is 1.6 x 10^-19 C.
- A mass of 8 X 10-24 kg has a charge of 4|e| where e is the charge on an electron. a) What is its KE at 4% of the speed of light? b) What is this in eV? c) What is the voltage needed to obtain this energy?A factory is spray-painting large sheets of metal electrostatically. The sheets have dimensions of 2.4 m by 2.4 m and are charged with 0.82 mC. A 10 kg drum of paint is charged with -89 μCμC, and the spray nozzle produces uniform droplets of 2.4 g. Assume that all charge is distributed uniformly on the sheet and in the paint and no charge is lost during the spraying process. Determine the magnitude of acceleration the paint droplets feel due to the metal sheet. Give your answer in units of ms2ms2.(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 8.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. 236000000000 X You can approach this problem as a unit conversion exercise in that you need to convert grams of silver to electrons using the information given in the problem as conversion factors (b) Imagine adding electrons to the pin until the negative charge has the very large value 1.00 mC. How many electrons are added for every 109 electrons already present? X 5.30 Note that 109 is one billion. It might help to rewrite your answer from part (a) as the number of billions of electrons. Need Help? Read It Watch It
- Flying insects such as bees may accumulate a small positive electric charge as they fly. In one experiment, the mean electric charge of 50 bees was measured to be ++(30 ±± 5) pCpC per bee. Researchers also observed the electrical properties of a plant consisting of a flower atop a long stem. The charge on the stem was measured as a positively charged bee approached, landed, and flew away. Plants are normally electrically neutral, so the measured net electric charge on the stem was zero when the bee was very far away. As the bee approached the flower, a small net positive charge was detected in the stem, even before the bee landed. Once the bee landed, the whole plant became positively charged, and this positive charge remained on the plant after the bee flew away. By creating artificial flowers with various charge values, experimenters found that bees can distinguish between charged and uncharged flowers and may use the positive electric charge left by a previous bee as a cue…Suppose a speck of dust in an electrostatic precipitator has Np = 3.75 × 1017 protons in it and carries a net charge of Q = -76 nC. Let qe represent the charge of an electron. a) Enter an expression for the number of electrons Ne in the speck of dust in terms of the charge of an electron, qe, and other variables from the problem statement. b) How many electrons are in the speck of dust?Two chloride ions and two sodium ions are in water, the "effective charge" on the chloride ions (CI) is -2.00 × 10-21 C and that of the sodium ions (Na) is +2.00 x 10-21 C. (The effective charge is a way to account for the partial shielding due to nearby water molecules.) Assume that all four ions are coplanar. 45.0% L. where a 0.280 nm, b=0.740 nm, and c= 0.670 nm. What is the direction of electric force on the chloride ion in the lower right-hand corner in the diagram? Enter the angle in degrees where positive indicates above the negative x-axis and negative indicates below the positive x-axis.
- Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. Imagine adding electrons to the pin until the negative charge has the very large value 1.00 mC. How many electrons are added for every 109 electrons already present?(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 8.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. 26.24e+23 You can approach this problem as a unit conversion exercise in that you need to convert grams of silver to electrons using the information given in the problem as conversion factors. (b) Imagine adding electrons to the pin until the negative charge has the very large value 2.00 mC. How many electrons are added for every 109 electrons already present?An object has a charge of -3.0μc. How many electrons must be removed so that the charge becomes +3.0μc?