The ability to regulate the amount of charge flowing in a circuit is Pennfoster: (A. resistance.) B. direct current. C. alternating current. (D. voltage.)
Which device typically use DC current to operate? Select one of the options below as your answer: A. television B. washing machine C. wristwatch D. electric hair dryer E. ceiling fan
1. During which phase of the moon may a solar eclipse occur? (Points : 1) new moon first quarter moon full moon third quarter moon Question 2. 2. During which phase of the moon may a lunar eclipse occur? (Points : 1) new moon first quarter moon full moon third quarter moon Question 3. 3. Which layer of the sun is visible during a total solar eclipse? (Points : 1) photosphere chromosphere core corona help plz
Old growth forests are full of sick, diseased, and decadent trees. Please select the best answer from the choices provided T F
N an ecosystem, energy that flows to tertiary consumers ultimately originates from the sun. Please select the best answer from the choices provided T F
What do sound waves and infrared waves have in common, and what makes them different? both carry energy through space, but sound waves are mechanical and infrared waves are electromagnetic. both can transfer energy through matter, but sound waves travel through air and infrared waves travel through space. both can transfer energy through matter, but sound waves can be heard and infrared waves can be seen. both carry energy through space, but sound waves require matter to pass through and infrared waves do not.
Which statement best compares potential and kinetic energy?. . A) Objects always have more potential energy than kinetic energy.. B)Only kinetic energy increases when the velocity of an object increases. . C)Only potential energy decreases when an object’s height increases.. D)Objects always have more kinetic energy than potential energ
Which statement is true about an atom and an element? An atom can be broken down into different substances and an element is formed when two or more atoms combine. An atom is made of identical elements and an element retains all of the characteristics of a particular atom. An atom is the smallest unit of matter and an element is a pure substance that is made of identical atoms.
The concentration of atmospheric carbon dioxide is currently decreasing due to human activities. TRUE OR FALSE?. .
A scientist is studying a shock wave from an earthquake. What kind of wave is being studied? an electromagnetic wave a gamma ray a radio wave a mechanical wave
Certain materials can become superconductors under what conditions? a. When it is very hot c. Under very high pressure b. When it is very cold d. Under very low pressure
What kind of weather would an occluded front likely bring? a.sunny and warm c.thunderstorms b.much precipitation d.cold and dry
How do the lights in a series circuit behave when one bulb burns out? The rest of the bulbs continue to shine at maximum brightness. The rest of the bulbs continue to shine at a lower brightness. The rest of the bulbs continue to shine at a higher brightness. The rest of the bulbs stop shining and shut off.
Once their strength is exceeded, rocks near the surface behave like A. modeling clay. B. most metals. C. glass objects. D. caramel candy.
6. The albedo of the Moon is _______ that of the Earth. A. overpowered by B. more than C. the same as D. less than
The ultimate source of energy that drives wind power is __________. view available hint(s) the ultimate source of energy that drives wind power is __________. the sun friction between the earth's plates, produced by plate tectonic movements and earthquakes ocean currents differences in the temperature of the earth's surface because of internal heating by magma, which occasionally rises to the surface in volcanoes
What force is needed to give a 0.25-kg arrow an acceleration of 196 m/s2? A. 0.25 N B. 49 N C. 196 N D. 748 N
He heating element of an electric dryer is rated at 4.1 kw when connected to a 240-v line. part a what is the current in the heating element? express your answer using two significant figures. i = a submitmy answersgive up part b is 12-gauge wire large enough to supply this current? is 12-gauge wire large enough to supply this current? yes no submitmy answersgive up part c what is the resistance of the dryer's heating element at its operating temperature? express your answer using two significant figures. r = ω submitmy answersgive up part d at 11 cents per kwh, how much does it cost per hour to operate the dryer? express your answer using two significant figures. cent
You have a pumpkin of mass m and radius r. the pumpkin has the shape of a sphere, but it is not uniform inside so you do not know its moment of inertia. in order to determine the moment of inertia, you decide to roll the pumpkin down an incline that makes an angle θ with the horizontal. the pumpkin starts from rest and rolls without slipping. when it has descended a vertical height h, it has acquired a speed of v = √(5gh/4).
How would you describe the two projectors used to screen a three-dimensional movie? A. Both projectors have vertical polarizers. B. One projector has a vertical polarizer and the other has a horizontal polarizer. C. Both projectors have horizontal polarizers. D. One projector is horizontal and the other is aligned at an angle to it.
Which two together represent the maximum penalty for violation of the cigarette contraband trafficking act CCTA?
What is the main difference between negative and positive feedback? a. Positive feedback leads to system instability, while negative feedback leads to system stability. b. Positive feedback is caused by human impact, while negative feedback occurs naturally. c. Negative feedback ultimately leads to an increase in the first variable, while positive feedback ultimately leads to a decrease in the first variable. d. Positive feedback occurs at a much faster rate than negative feedback.
How many shifts must you work if you wish to wash 10 loads of laundry? express your answer numerically as an integer?