Fusion occurs in the _______ of the Sun, where the pressure and temperature are very high. a. photosphere b. core c. chromosphere d. solar wind
The acceleration of gravity is a constant equal to _______ meters per second squared. A. 8.4 B. 9.8 C. 7.6 D. 10.2
Which best illustrates the way in which radiation transfers thermal energy? (in order from top to bottom) A. B. C. D. Download png
Using the conversion factor from eV (electron volts) to joules, determine which energy line for an electron dropping from one energy level to another would show a line at 435 nm in an emission spectrum. Use the formulas and the energy level information below to answer the question. Needed constants: 1.00eV = 1.6 * 10^-19 J c = 3.00 * 10^8 m/s h = 6.63 * 10^-34 J*s Energy Level Values: E6: E= -0.378 eV E5: E= -0.544 eV E4: E= -0.850 eV E3: E= -1.51 eV E2: E= -3.403V
The outer shell of the atoms in group D____ Are empty Are half full Are full Need one more electron to be full.Download png
A very long, uniformly charged cylinder has radius R and linear charge density λ. Find the cylinder's electric field strength outside the cylinder, r≥R . Give your answer as a multiple of λ/ ε 0
How was Bohr's atomic model similar to Rutherford's model? A. It assigned energy levels to electrons. B. It described electron positioning in terms of the electron cloud model. C. It described how electrons gain or lose energy. D. It described a nucleus surrounded by a large volume of space.
What is the porosity of the gravel sample?(The sediment volume for each sample is 400ml.) a. 23.75% b. 28.75% c. 55.75% d. 81.75% if you need help to solve this question use this link. https://www.explorelearning.com/index.cfm?method=cExtAccessSecure.dspResource&ResourceID=431&certificate=authorizer%3dE2020%26userid%3dGizmos4Test%26expires%3d2018%2f01%2f08+05%3a06%3a16%26hash%3dsRFNNNyZ13MEV1BNFpQTiQ%253d%253d
Which sequence is an example of radioactive decay? A. The nuclei of two hydrogen atoms fuse together, forming a helium nuclide. B. A calcium atom gives its electrons to two fluorine atoms, forming a formula unit of calcium fluoride. C. A polonium isotope becomes a lead isotope when the polonium nuclide emits two protons and two neutrons. D. Energy from an electric current splits a water molecule into two hydrogen atoms and one oxygen atom.
Which one of the following environments will sound not travel through? A. Liquid B. Gas C. Solid D. Vacuum
The chief physicist in charge of the manhattan project was _____. wernher von braun j. robert oppenheimer albert einstein leslie groves
A rifle with a barrel length of 60 cm fires a 10 g bullet with a horizontal speed of 400 m/s. The bullet strikes a block of wood and penetrates to a depth of 12 cm. . a. what resistive force (assumed to be constant) does the wood exert on the bullet? . b. How long does it take the bullet to come to rest? . c. Draw a velocity verses time graph for the bullet in the wood.
Magnetic reversals have helped to support a. the theory of Pangaea. c. sea-floor spreading. b. the age of the Earth. d. the theory of Gondwana.
Which of the following is NOT a behavioral difficulty children with fetal alcohol syndrome face? A. problems with shyness B. problems with impulse control C. problems with language outbursts D. problems with hyperactivity Please select the best answer from the choices provided. A B C D
A child, starting from rest at the top of a playground slide, reaches a speed of 7.0 meters per second at the bottom of the slide. what is the vertical height of the slide? [neglect friction.]
Which example describes and nonrenewable resource? A. everyone in our neighborhood uses solar panels to generate electricity to run their pool pumps. B. Once up and running, the power plant will convert the energy from tides and waves into electricity. C. There is a long stretch of land in the desert with the many windmills that are able to generate enough electricity to run to town. D. there are drilling platforms all along the coast that all used to drill for natural gas that can be used to generate electricity.
Sunlight is a form of energy called _____. electromagnetic energy nuclear energy hydro energy magnetic energy
How can you optimize your physical health? a. healthy diet, adequate sleep, and cosmetic surgery b. cosmetic surgery, perfectly straight teeth, and tanned skin c. good physical fitness, disease-free, adequate sleep, and healthy diet d. good physical fitness, disease-free, cosmetic surgery, and healthy diet
A 2700 Ohm resistor and electric circuit draws a current of 2.4 Milliamperes the total charge that passes through the resistor in 15 seconds is
Which statement is true for objects in dynamic equilibrium? A)Objects have zero acceleration. B)Objects have non-zero positive acceleration. C)Objects have non-zero negative acceleration. D)Objects can have positive as well as negative acceleration. E)Objects have forces which are not balanced in at least one direction.
If critical mass is reached, it can cause: A: electrons to split B: a chain reaction C: a fusion of uranium nuclei D: krypton atoms to split into strontium and xenon
The relationship between charges can be described by saying, a.) charges do not interact. b.) negative charges attract. c.) neutral charges repel. d.) opposite charges attract.
What is the resistance of a clock if it has a current of 0.30 a and runs on a 9.0-v battery? 0.033 2.7 9.3 30