Which statements about acceleration are true? check all that apply. a. the si units of acceleration are m/s2. b. for acceleration, you must have a number, a unit, and a direction. c. to calculate acceleration, divide the change in speed by the change in time. d. the symbol for acceleration is .
Which best describes the first law of thermodynamics as compared to the second law of thermodynamics?
Which would cause the greatest increase in the acceleration of a satellite?a decrease in the radius and the tangential speedan increase in the radius and the tangential speeda decrease in the radius and an increase in the tangential speedan increase in the radius and a decrease in the tangential speed
The area of a circular trampoline is 108.94 square feet. What is the radius of the trampoline? Round to the nearest hundredth. A. 10.44 feet B. 5.89 feet C. 34.68 feet D. 3.32 feet
What lever has resistance between the axis (fulcrum) and the force (effort)? a. first b. second c. third d. fourth
An endothermic reaction is one that uses which form of energy?Nuclear FusionElectrical EnergyChemical EngerySound Energy
Niobium has a density of 8.57 g/cm3 and crystallizes with the body-centered cubic unit cell. Calculate the radius of a niobium atom.
Hoover believed that the private sector would pull the United States out of the Depression. true false
Figure 1 shows a wave movement during one second. What is the frequency of the wave A)2 hertz B)2 meters/second C)0.5 second D)1 hertz Download png
One major cause of floods is A. rapid spring snowmelt. B. light rain over a large area. C. a decrease in stream discharge. D. increased capacity of stream channels.
Calculate the frequency of each wavelength of electromagnetic radiation:12.24 cm (wavelength of microwave oven)
Why is it difficult to test the efficacy of biofeedback using experimental techniques? A. It is difficult to devise a control treatment that replicates biofeedback. B. Biofeedback cannot be subjected to testing because it is pseudoscience. C. The principles of biofeedback are not entirely understood. D. Biofeedback is not concerned with any scientific subject
Which best describes what happens when light traveling through air enters water at an angle? A. It moves along straight lines in air and changes direction when it enters water. B. It moves in a curve in air and moves in straight lines when it enters water. C. It moves along straight lines in air and continues along the same lines when it enters water. D. It moves in a curve in air and continues moving in the same curve when it enters water.
Without the force of friction, people would not be able to walk. please select the best answer from the choices provided. t f
Which of the following best describes a plane? A. A curve in a road B. The surface of a flat table C. The edge of a desk D. The point of intersection of two walls
Which reaction would produce a solution that conducts electricity extremely well? Please help Download png
1. The equation 2NO2 <---> N2O4 shows a system. A) In chemical equilibrium B) In physical equilibrium C) That does not reach equilibrium D) That does not change 2. If an endothermic reaction is in equilibrium, what will happen when you increase the temperature? A) More reactants form B) More products form C) No change in the amounts of products or reactants occurs D) The system does not reach equilibrium again 3. Only way to determine the degree of saturation of a solid-liquid solution is to drop a crystal of the solute into the solution. If the crystal sits at the bottom of the container, the solution is? A) Saturated B) Unsaturated C) Supersaturated D) Concentrated Thank you in advance <3
To what is amplitude related? (1 pointthe amount of energy carried by the wave the maximum displacement from the rest position neither of the above both the first and the second choices above amplitude is related to both the amount of energy carried by the wave and the maximum displacement from the rest position . [ ] [ [ ] ]
Surface winds on Earth are primarily caused by differences in A) Air density due to unequal heating of Earth's surface. B) Distances from the Sun during the year. C) Rotational speeds of Earth's surface at various latitudes. D) Ocean wave heights during the tidal cycle. Explain pls
Communities of organisms coexist in organized, balanced _____? A-ranges B-territories C-ecosystems D-populations
Which statement describes a major drawback of the Bohr model that caused scientists to replace it? A) It worked only for helium and larger atoms. B) It did not identify the distance between an electron and the nucleus. C) It contradicted the Heisenberg uncertainty principle. D) It stated that spectral lines of atoms are similar.
The position of a 2.75×105n training helicopter under test is given by r⃗ =(0.020m/s3)t3i^+(2.2m/s)tj^−(0.060m/s2)t2k^. part a find the net force on the helicopter at t=5.0s.
An electron is located in an electric field of magnitude 600. newtons per coulomb. what is the magnitude of the electrostatic force acting on the electron?
A kayaker needs to paddle north across a 100-m-wide harbor. the tide is going out, creating a tidal current that flows to the east at 2.0 m/s.the kayaker can paddle with a speed of 3.0 m/s. a. in which direction should he paddle in order to travel straight across the harbor? b. how long will it take him to cross?
Which of the following reactions involves the transfer of electrons? a. synthesis c. combustion b. decomposition d. reduction-oxidation
Calculate the displacement of the volleyball in sample problem 2f when teh volleyballs final velocity is 1.1 m/s upward