The elbow is considered a third class lever because __________. a. the effort is applied further from the fulcrum than the load b. the effort is applied closer to the fulcrum than the load c. the fulcrum is in the center of the lever d. the elbow is used to lift objects
Which statement about the inner and outer planets is true? a.The inner planets revolve and rotate slower than the outer planets. b.The inner planets revolve and rotate faster than the outer planets. c.The inner planets revolve slower and rotate faster than the outer planets. d.The inner planets revolve faster and rotate slower than the outer planets.
Tides are a result of A. currents in the ocean. B. strong winds in the equatorial regions. C. friction caused by the Earth's rotation. D. the gravitational attraction of the Sun and Moon
What will the resistance be for a lamp that draws 4.6 amps of current from a 120-volt outlet? A. 550 ohms B. 115 ohms C. 26 ohms D. 0.038 ohms E. 5.7 ohms
A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed. The ball has a mass m = 0.16 kg and moves at v = 5.33 m/s. The circular path has a radius of R = 1.13 m. What is the minimum velocity so the string will not go slack as the ball moves around the circle?
An atom that gains or loses an electron has a net electric charge and is called a/n a. proton. b. ion. c. electron. d. neutron. user: which sentence best describes mass movement? a. the steady pace of air bouncing off a mountain b. the downhill movement of animals due to heavy snow in their normal home c. the movement of particles within an atom d. the downhill flow of soil and rock resulting from gravity
Which of the following does not take place in the water cycle? a. precipitation b. evaporation c. carbonation d. condensation
Which statement correctly describes the relationship between power, voltage, and current? If voltage is increased, and no other changes are made, power will decrease. If voltage is increased, and no other changes are made, power will increase. If current is decreased, and no other changes are made, power will increase. In order to decrease power, voltage must be decreased.
Which of the following statements is true about Planck's Law?. . A. The frequency of the emitted light is inversely proportional to the energy given off by the electrons.. . B.The frequency of the emitted light is directly proportional to the energy given off by the electrons.. . C. The wavelength of the emitted light is directly proportional to the energy given off by the electrons.. .D. The wavelength of the emitted light is inversely proportional to the energy given off by the electrons.
A container of gas is at a pressure of 1.3x10^5 Pa and a volume of 6 m^3. How much work is done by the gas if it expands at a constant pressure to twice its initial volume.
A center-seeking force related to acceleration is _______ force A. centrifugal B. centripetal C. frictional D. gravitational
Which direction does air flow within a cyclone? a. Air rises. b. Air sinks. c. Air flows laterally. d. Air does not move in a cyclone.
Stars are able to form from clouds of dust and gas because of. A) The Law of Entropy. B) The Law of Propulsion. C) The Law of Universal Gravitation. D) The Law of Stellar Evolution
The ability of solid rock to flow is called _____. convection plasticity seafloor spreading seismology
Which of the following are true statements about electronegativity? Check all that apply. A. A very electronegative atom gives up electrons quickly in reactions. B. Electronegativity increases as the number of protons in an atom decreases. C. Electronegativity is the ability of an atom to attract electrons. D. Electronegativity tends to be higher in nonmetals than in metals.
Select the statement that best describes how the forces relate.A. The object on which they are acting and the distance to that object determines the amount of force.B. nuclear and magnetic forces are different because magnetic forces are associated with unmoving charges, and weak nuclear forces are associated with moving charges.C. All forces are related to the mass of the object on which they are acting.The larger the mass, the weaker the forces become. D. Magnetic and electrical forces are similar because they are both related to the interactions between charged particles.
The temperature of refrigeration units, salad bars and other cold items must be kept at ____ or colder: a. 41 f (5 c) b. 45 f (9 c) c. 50 f (10 c) d. 35 f (2 c)
What portion of the electromagnetic spectrum can human eyes detect? A. visible light B. visible light and infrared light C. infrared light D. infrared light and ultraviolet light
1. Acceleration is best defined as the rate of change of __________ of an object. A. position B. force C. speed D. velocity 2. Which of the following describes acceleration? A. s/m B. m/s C. m/s2 D. m2 3. Which of the following is the main difference between speed and velocity? A. Speed has direction and velocity B. Speed is measured over time C. Velocity has both speed and direction D. Speed is constant
In order to be considered work, the components that must be present are a force and a movement in the same direction as the force. an action which causes movement and an opposite reaction. an action which causes no movement or reaction. a force and a movement in the opposite direction of the force.
Einstein’s postulate that concerns the speed of light is that rulers and clocks cannot be used to measure the speed of light nothing can travel faster than the speed of light all uniformly moving observers measure the same speed of light the speed of light is defined as 3 E8 m/s
The compound LiBr is an example ofA. metallic compoundB. covalent compoundC. ionic compoundD. element
Energy that is not passed on from one trophic level to the next is _______.. a. lost as heat. b. returned to the sun. c. destroyed. d. all of the above.
A composition of two isometries results in __________. A. an increase in size B. preservation of length C. the same orientation D. a reduction in size
If you are given time and distance, you can determine power if you know force. watts. energy. joules.
Which statement describes the relationship of resistance and current? 1.Resistance is directly proportional to current because R = . 2.Resistance is inversely proportional to current because R = . 3.Resistance is directly proportional to current because R = VI. 4.Resistance is inversely proportional to current because R = VI.