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Questions in physics

📝 Answered - A stone is thrown vertically upward with [tex]$40 m / s$[/tex]. Calculate: (i) velocity of the stone after 1.5 sec (Use [tex]$g =9.8 m / s ^2$[/tex]) (ii) time taken to reach max height (iii) total distance travelled by the stone before return back to the surface.

📝 Answered - Which of the following does NOT remove particulate matter (PM) from the atmosphere? A. Snow B. Photosynthesis C. Gravity D. Train

📝 Answered - The equation $T^2=A^3$ shows the relationship between a planet's orbital period, $T$, and the planet's mean distance from the sun, $A$, in astronomical units, $A U$. If the orbital period of planet $Y$ is twice the orbital period of planet $X$, by what factor is the mean distance increased? A. $2^{\frac{1}{3}}$ B. $2^{\frac{1}{2}}$ C. $2^{\frac{2}{3}}$ D. $2^{\frac{3}{2}}$

📝 Answered - The loudest sound measured one night during a hockey game was 112 dB. The loudest sound measured during a hockey game the next night was 118 dB. What fraction of the sound intensity of the second game was the sound intensity of the first game? [tex] \begin{array}{l} L=10 \log \left(\frac{1}{t_0}\right) \\ L=\text { loudness, in decibels } \\ I=\text { sound intensity, in watts } / m^2 \\ t_0=10^{-12} \text { watts } / m^2 \end{array} [/tex] A. 0.25 B. 0.78 C. 0.95 D. 0.99

📝 Answered - Select the correct answer. What is the value of work done on an object when a 0.1x102-newton force moves it 30 meters and the angle between the force and the displacement is 25°? A. 27 x 10² joules B. 3.0 x 10² joules C. 7.5 x 10² joules D. 0 joules

📝 Answered - The loudness, [tex]$L$[/tex], measured in decibels (Db), of a sound intensity, [tex]$I$[/tex], measured in watts per square meter, is defined as [tex]$L=10 \log \frac{1}{f_0}$[/tex], where [tex]$f_0=10^{-12}$[/tex] and is the least intense sound a human ear can hear. What is the approximate loudness of a dinner conversation with a sound intensity of [tex]$10^{-7}$[/tex] ? A. -58 Db B. -50 Db C. 9 Db D. 50 Db

📝 Answered - Which method does the Kepler Mission use to detect extrasolar planets? A. Astrometric B. Doppler C. Transit D. All of the above

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - Which will a positively charged object attract? A. an object that has a negative charge B. an object that has a smaller positive charge C. an object that has no charge D. an object that has a larger positive charge

📝 Answered - Match each form of energy with its description: Elastic potential energy Gravitational potential energy Mechanical energy * Energy of an object because of its potential and kinetic energy * Energy of an object because of its height above a surface * Energy stored in a compressed or stretched object