1) Two Objects A and B are placed close to each other but are not in...
1) Two Objects A and B are placed close to each other but are
not in contact. Object A has a charge of +5C and Object B has a
charge of +7C. Explain what would happen if both the objects are
brought close together so that they are now in contact with each
other. (3 marks)
b) If at a point in time there were 300 nuclei of a particular
radionuclide in a container, how many nuclei will be left after 4
half-lives of time have elapsed? (2 marks)
c) Express the equation KE = ½ mv2 as a proportionality statement
and indicate which is/are the independent variable(s). (2
marks)
2) If the phone charger consumes 30 W of electrical
power when operating, how much current would flow through it when
connected to a household supply? (Show your working and explain
your answer.)
Homework Answers
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1) Two Objects A and B are placed close to each other but are
not in...
Two battery chargers (one for your laptop and the other for your phone) are plugged in...
Two battery chargers (one for your laptop and the other for your phone) are plugged in at the same powerpoint. a) If the phone charger consumes 30 W of electrical power when operating, how much current would flow through it when connected to a household supply? (Show your working and explain your answer.) b) Explain how the laptop battery charger would be able to provide electrical safety to the operator in case of a short circuit. The laptop charger has...
Two battery chargers (one for your laptop and the other for your phone) are plugged in...
Two battery chargers (one for your laptop and the other for your phone) are plugged in at the same powerpoint. a) If the phone charger consumes 30 W of electrical power when operating, how much current would flow through it when connected to a household supply? (Show your working and explain your answer.) b) Explain how the laptop battery charger would be able to provide electrical safety to the operator in case of a short circuit. The laptop charger has...
Objects A and B of equal mass are brought into close thermal contact with each other,...
Objects A and B of equal mass are brought into close thermal contact with each other, but they are well isolated from their surroundings. Initially TA = 0°C and TB = 100°C. The specific heat of A is the same as the specific heat of B. The two objects will soon reach a common final temperature Tf. The final temperature is: a. Tf > 50°C. b. Tf < 50°C. c. Tf = 50°C.
Two spherical nonpolarizing insulators each carrying 1 unit of uniform excess positive charge are brought close...
Two spherical nonpolarizing insulators each carrying 1 unit of uniform excess positive charge are brought close to each other. What happens? A. The two objects attract each other B. There is no force between the two objects. C. The two objects repel each other. D. The two objects exchange charges.
Question 1: (Total 25 marks. Each question is worth 5 marks each) For each of the...
Question 1: (Total 25 marks. Each question is worth 5 marks each) For each of the statements below, indicate whether the statement is true or false and explain your reasoning A. Object A with a net charge of +5C is placed 1 cm away from Object B with a net charge of +8C. When Object A is moved a further 2 cm away from Object B, the size of the force between the two objects will increase. B. Two balloons...
Do each question separately and show step by step Two spherical objects are separated by a...
Do each question separately and show step by step
Two spherical objects are separated by a distance of 2.80 mm. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons, As a result, each object experiences an electrostatic force that has a magnitude of 1.44 times 10^-25 N. How many electrons did it take to produce the charge on one of...
QUESTION 8 Assume two negative charges are placed close to each other, with one charge fixed...
QUESTION 8 Assume two negative charges are placed close to each other, with one charge fixed and one charge fr a. remain stationary o b accelerate away from the fixed charge. Cmove closer to the fixed charge. d orbit the fixed charge in a circular motion. QUESTION 9 Which of the following statements about electric current is correct? unt of current flowing in a piece of silver wire with a voltage difference of zero across its two ends is never...
Assume two negative charges are placed close to each other, with one charge fixed and one...
Assume two negative charges are placed close to each other, with one charge fixed and one charge free to move. The free charge will: O a accelerate away from the fixed charge. b. move closer to the fixed charge. Og C. orbit the fixed charge in a circular motion. d. remain stationary. Which of the following statements about insulating materials is correct? oa. Soaking paper in salt water decreases its insulation capability O b. The amount of current flowing in...
Question 1 Two protons are brought close to each other. The distance that separates them is...
Question 1 Two protons are brought close to each other. The distance that separates them is 4.5 x 10°°m. What is the electric force between the two protons? No answer provided a. 8.35 x 1013N b. 4.136 x 10-15 c.1.136 x 10-16 d. 2.56 x 10-N e 2.56 x 10'N f. 1.136 x 10-17N Question 2 Two charges, one of 10 C and one of -40 C, are separated by 30-cm. What is the electric force between them? A No...
Background (Part 1): We are continuously exposed to ionizing radiation from natural and artificial sources. All...
Background (Part 1): We are continuously exposed to ionizing radiation from natural and artificial sources. All of us are exposed to radiation every day, from natural sources such as minerals in the ground and cosmic radiation to man-made sources such as medical x-rays. According to the National Council on Radiation Protection and Measurements (NCRP), the average annual radiation dose per person in the U.S. is 620 millirem. In this activity, you will use the interactive online dose calculator to estimate...
Question 1: (Total 25 marks. Each question is worth 5 marks each) For each of the statements below, indicate whether the statement is true or false and explain your reasoning A. Object A with a net charge of +5C is placed 1 cm away from Object B with a net charge of +8C. When Object A is moved a further 2 cm away from Object B, the size of the force between the two objects will increase. B. Two balloons...
Do each question separately and show step by step
Two spherical objects are separated by a distance of 2.80 mm. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons, As a result, each object experiences an electrostatic force that has a magnitude of 1.44 times 10^-25 N. How many electrons did it take to produce the charge on one of...
QUESTION 8 Assume two negative charges are placed close to each other, with one charge fixed and one charge fr a. remain stationary o b accelerate away from the fixed charge. Cmove closer to the fixed charge. d orbit the fixed charge in a circular motion. QUESTION 9 Which of the following statements about electric current is correct? unt of current flowing in a piece of silver wire with a voltage difference of zero across its two ends is never...
Assume two negative charges are placed close to each other, with one charge fixed and one charge free to move. The free charge will: O a accelerate away from the fixed charge. b. move closer to the fixed charge. Og C. orbit the fixed charge in a circular motion. d. remain stationary. Which of the following statements about insulating materials is correct? oa. Soaking paper in salt water decreases its insulation capability O b. The amount of current flowing in...
Question 1 Two protons are brought close to each other. The distance that separates them is 4.5 x 10°°m. What is the electric force between the two protons? No answer provided a. 8.35 x 1013N b. 4.136 x 10-15 c.1.136 x 10-16 d. 2.56 x 10-N e 2.56 x 10'N f. 1.136 x 10-17N Question 2 Two charges, one of 10 C and one of -40 C, are separated by 30-cm. What is the electric force between them? A No...
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