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Questions in physics

[Jawaban] How many orbits has Pluto completed around the Sun since we discovered it? A. More than 85, since it was discovered in 1930 B. About 248 since its orbital period is 248 years C. None, it is still on the same orbit as when it was discovered D. We have not seen it long enough to have figured it out

[Jawaban] 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.

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

[Jawaban] 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. $2^{\frac{3}{2}}$

[Jawaban] 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

[Jawaban] 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

[Jawaban] 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

[Jawaban] Which method does the Kepler Mission use to detect extrasolar planets? A. Astrometric B. Doppler C. Transit D. All of the above

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

[Jawaban] 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