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Questions in physics

[Answered] While researching a topic, a student has taken the following notes: - Uranus has twenty-seven moons, including Oberon and Miranda. - Oberon completes an orbit of Uranus in 13.46 Earth days on average. - Miranda completes an orbit of Uranus in 1.41 Earth days on average. - German mathematician and astronomer Johannes Kepler (1571-1630) described the orbits of planets as elliptical in shape rather than circular. - Kepler published three laws of planetary motion to describe the orbits of planets around the Sun. - Kepler's laws also apply to the elliptical orbits of natural satellites (e.g., moons). The student wants to contrast the orbits of the two moons. Which choice most effectively uses relevant information from the notes to accomplish this goal? A. Miranda completes its orbit of Uranus many times faster than Oberon does. B. Kepler's three laws of planetary motion describe the orbits of planets and natural satellites, including those of Oberon and Miranda. C. Oberon's orbit of Uranus is elliptical in shape and takes, on average, 13.46 Earth days, while Miranda's orbit of Uranus is circular in shape and takes, on average, 1.41 Earth days. D. Uranus's moons, specifically Oberon and Miranda, orbit their planet in the same way the planets orbit the Sun.

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

[Answered] Which equation should she use? A. [tex]$k=2 P x^2$[/tex] B. [tex]$k=\frac{1}{2} P x^2$[/tex] C. [tex]$k=\frac{2 P}{x^2}$[/tex] D. [tex]$k=\frac{P}{2 x^2}$[/tex]

[Answered] Vibrate and record. Tabulate your readings. | s/4 | u (cm) | v (cm) | m = v/4 | |---|---|---|---| | 1.05 | 25.00 | 96.50 | | | 2.00 | 30.00 | 82.40 | | | 3.00 | 25.00 | 77.50 | | | 4.00 | 40.00 | 76.00 | | | 5.00 | 45.00 | 77.10 | |

[Answered] A cylindrical disc made of lead has radius 24 cm and thickness 2 cm. There is a hole in the center of radius 2 cm. If the density of lead is 182 grams per cubic inch, what is the mass of the disc in kilograms rounded to the nearest tenth? (1 inch = 2.54 cm) (1 kilogram=1,000 grams)

[Answered] A black-body at temperature T emits radiation of peak wavelength λ. If the temperature of a body is made double, peak wavelength will shift to: (A) λ/2 (B) 2λ (C) λ/4 (D) 4λ

[Answered] Consider a steel bar of length 1.5 m at 10 °C. It is heated to raise its temperature to 100 °C. Calculate: (a) Increase in length (b) Final length at 100 °C (Coefficient of linear thermal expansion of steel is 1.2 × 10⁻⁵ K⁻¹)

[Answered] The velocity 'v' of a particle at time t is given by: [tex]v = \frac{a}{t} + \frac{bt}{t^2 + c}.[/tex] Determine the dimensions of a, b, and c respectively.

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

[Answered] Write down two ways transverse waves and longitudinal waves are similar.