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Questions in physics

[Answered] Sound intensity model: [tex]L=10 \log \left(\frac{I}{I_0}\right)[/tex] [tex]L =[/tex] loudness, in decibels (dB); [tex]I=[/tex] sound intensity, in watts/[tex]m^2[/tex]; [tex]I_0=10^{-12}[/tex] watts/[tex]m^2[/tex] The loudness of a jack hammer is 96 dB. Its sound intensity is about ______. The loudness of a compactor is 94 dB. Its sound intensity is about ______.

[Answered] Design an object that floats in water, can carry extra mass such as a person or equipment, and uses correct reasoning related to mass, volume, and density.

[Answered] Working of rocket or jet is based on: 1. Newton's first law 2. Newton's second law 3. Newton's third law

[Answered] Which statement describes Newton's law of universal gravitation? A. Mass has little effect on gravity between objects. B. Gravity pushes objects away from Earth's center. C. Gravity does not act between Earth and the moon. D. Every object in the universe attracts every other object.

[Answered] Oran wants to model the behavior of Earth's magnetic field when Earth's magnetic south is near Earth's geographic north using a ball, a bar magnet, and a compass. He designates the top of the ball as Earth's geographic north. | Model | Where Oran should place the south pole of the bar magnet | Where the south pole of the compass points | |---|---|---| | 1 | at the bottom of the ball | towards the magnetic south pole | | 2 | at the top of the ball | towards the magnetic south pole | | 3 | at the bottom of the ball | towards the magnetic north pole | | 4 | at the top of the ball | towards the magnetic north pole | Which model in the table would most likely represent Oran's model? A. Model 1 B. Model 2 C. Model 3 D. Model 4

[Answered] How does increasing the amount of charge on an object affect the electric force it exerts on another charged object? A. The electric force increases because the amount of charge has an indirect relationship to the force. B. The electric force increases because the amount of charge has a direct relationship to the force. C. The electric force decreases because the amount of charge has an indirect relationship to the force. D. The electric force decreases because the amount of charge has a direct relationship to the force.

[Answered] A spider monkey (mass 4 kg) is frolicking through the jungle at a speed of 3.2 m/s. All of a sudden, a jaguar appears and tries to eat the monkey. The monkey begins to run frantically—now he has a speed of 13 m/s. How much work does the monkey do to increase its speed? Show your calculations.

[Answered] Can the resultant of two vectors be zero? If so, under what conditions? Explain your answer.

[Answered] Sound intensity model: [tex]L=10 \log \left(\frac{I}{I_0}\right)[/tex] [tex]L =[/tex] loudness, in decibels [tex]( dB ) ; I =[/tex] sound intensity, in watts [tex]/ m ^2 ; I_0=10^{-12}[/tex] watts [tex]/ m ^2[/tex] The loudness of a jack hammer is 96 dB. Its sound intensity is about A. 0.0096 B. 0.004 C. 0.0021

[Answered] Which of the following is NOT a statement of the Universal law of gravitation? A. Gravitational force is always attractive B. Gravitational force diminishes with the increase of distance of separation between two objects C. Gravitational force is independent of mass D. The law is applicable for small mass objects as well as planets