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Questions in physics

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

[Answered] The orbital period, [tex]$P$[/tex], of a planet and the planet's distance from the sun, [tex]$a$[/tex], in astronomical units is related by the formula [tex]$P=a^{\frac{3}{2}}$[/tex]. If Saturn's orbital period is 29.5 years, what is its distance from the sun? A. 9.5 AU B. 19.7 AU C. 44.3 AU D. 160.2 AU

[Answered] Which proportionality does Kepler's third law describe? T² α d

[Answered] In a lab experiment, a student is trying to apply the conservation of momentum. Two identical balls, each with a mass of 1.0 kg, roll toward each other and collide. The velocity is measured before and after each collision. The collected data is shown below. | | Initial Velocity Ball A (m/s) | Initial Velocity Ball B (m/s) | Final Velocity Ball A (m/s) | Final Velocity Ball B (m/s) | | :------ | :-----------------------------: | :-----------------------------: | :---------------------------: | :---------------------------: | | Trial 1 | +1.0 | -2.0 | -2.0 | -1.0 | | Trial 2 | +0.5 | -1.5 | -0.5 | -0.5 | | Trial 3 | +2.0 | +1.0 | +1.0 | -2.0 | | Trial 4 | +0.5 | -1.0 | +1.5 | -1.5 | Which trial shows the conservation of momentum in a closed system? A. Trial 1 B. Trial 2 C. Trial 3 D. Trial 4

[Answered] Describe briefly an experiment to demonstrate that two different metals expand at different rates.

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

[Answered] Find the resultant of the following vectors: a) i + j - k and i + 2j - k [2 Marks] b) 2i - j + 3k and i - j - k [2 Marks]

[Answered] A cyclist travels 30 km north in 2 hours and then returns back to the starting point in 1.5 hours. What is the cyclist's average speed and average velocity for the entire journey?

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

[Answered] Explain Newton's three laws of motion principles.