Which of the following describes forces? They can be touched. They can be seen on sunny days. They can change motion.
Once triggered, the gate of the __ loses control of the current flow and it will keep conducting. triac SCR both A and B
If you continued to heat a pot of water after it reached its boiling point, what would happen? A. Its temperature would rise above 100^circ C B. Its temperature would drop below 100^circ C C. Its temperature would stay at 100^circ C D. Its temperature would rise above 100^circ C then slowly drop.
The highest tides occur when the __ Earth and Sun are lined up Earth and Moon are lined up and the Sun is at a 90-degree angle Earth and Moon are lined up Sun and Moon are lined up Earth, Sun, and Moon are lined up
110. Related with the radiant energy it is current to say: It is energy in form of electromagnetic waves. It is energy in form of a flow of photons. It is expressed or measured in Joules. All of the above.
What radius must the sphere have so that the acceleration due to gravity at the Earth's new surface would equal the acceleration due to gravity at the surface of the Sun? Express your answer using three significant figures and include the appropriate units. R=Value Units
The search for exoplanets is challenging because of a number of constraints Which of the following is not a constraint? Choose one: A. the distance to exoplanetary systems B. the orbital periods of many exoplanets C. the existence of appropriate Sun-like stars D. the orientation of many planetary orbits in relation to their star E. the proximity of planets to their star
The angular displacement by which the voltage and current are out-of phase with each other is referred to as __ a. the angle theta b. the current angle c. the power angle d. the voltage angle
How can we describe the relationship between volume and matter? A. Volume is not generally measured. B. Volume is unchangeable in most types of matter. C. Volume is more changeable in liquids than gases. D. Volume changes with changes in temperature.
__ 1. True or False:A negative charge exists on a body that loses free electrons. __ 2. What units are used to measure electric field strength? __ 3. When drawing electric lines of force, what direction does __ the charge flow? __ __ 4. What term is defined as the amount of work done when a unit positive charge is transported from the ground to a particular point and no further? __ 5. Write the equation for potential difference relating the work done to the unit of charge. __ 6. Where on a solid object is static charge most concentrated? __ __ __ 7. What is the name given to lines that connect points with the same potential? Define the following term. 8. induction- Briefly answer the following essay question. 9. What is the relationship between force and distance in Coulomb's law of electric force?
1. Choose the correct statement or equation. When a wave in a string reflects from an open or flexible end, the reflected wave has the same wavelength and amplitude as the original wave. When a wave in a string reflects from a fixed end, the reflected wave has the same wavelength and amplitude as the original wave.
In what ways are meteorites different from meteors? What is the probable origin of each? Meteors typically come from comets that have passed through the solar system; their solid material is freed when the ice is vaporized by the heat of the Sun. Meteorites miss the atmosphere whereas meteors hit the outer layers only. Most meteors come from Mars and carry important information about the past of the red planet. Meteorites are large enough to withstand the violent passage through Earth's atmosphere, whereas meteors burn up from the heat of friction. Most meteorites, on the other hand, are from asteroids or from debris kicked up on the Moon or Mars during an impact.
If a rock is dropped from a height of 87 ft, its poistion t seconds after it is dropped until it hits the ground is given by the function $s(t)=-16t^{2}+87$ Round values below to 3 decimal places. How long does it take the rock to hit the ground? $\square $ seconds Find the average velocity of the rock from when it is released until when it hits the ground. $\square $ feet per second What time after the rock is thrown will its instantaneous velocity be equal to its average velocity? (Apply the Mean Value Theorem) $\square $ seconds after it is thrown
The bending or change in angle of light as it passes through a lens is called $\square $
Photons of a certain infrared light have an energy of $1.91\times 10^{-19}J$ (a) What is the frequency of this IR light? $\square $ Hz (b) Use $\lambda =c/f$ to calculate its wavelength in nanometers. $\square $ nm
The outer planets of the solar system were formed by asteroid agglomeration comet collisions gravitational forces temperature increases
Multiple Choice 2 points Step 3 of Part 2: The flashlight is shining to an azimuth of 225 degrees. What is the azimuth of the shadow? 0 degrees 45 degrees 90 degrees 180 degrees
1) The height of the Washington Monument is measured to be 170 m on a day when the temperature is $35.0^{\circ }C$ What will its height be on a day when the temperature falls to $-10.0^{\circ }C$ Although the monument is made of limestone, assume that its thermal coefficient of expansion is the same as marble's.
A point is subjected to 5 ksi biaxial tension. The diameter of the corresponding Mohr's circle is most nearly: O 5 ksi 7.07 ksi 10 ksi
A ball is thrown vertically upward. After r seconds, it's height him feet) is given by the function $h(t)=40t-16t^{2}$ After how long will It reach its maximum height? Do not round your answer. Time: $\square $ seconds
