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Questions in physics

[Done] There are two ways to transfer energy: by particle transfer and by wave. Give an example of each.

[Done] What is the equation for calculating electric power?

[Done] If a transformer has a primary with 100 V and fifty coils, and a secondary that yields 20 V, how many coils are on the secondary? A. 200 B. 20 C. 50 D. 10 E. 100

[Done] An increase in which quantity will result in an increase in momentum?

[Done] A particle moves along the x-axis so that when [tex]t > 0[/tex], its position function is given by [tex]\cos(\sqrt{t})[/tex]. What is the velocity of the particle at the first instance when the particle is at the origin?

[Done] If a force does not act parallel to the resulting displacement, what is the effect on the work done by the force?

[Done] A man stands on a cliff that is 10 m above the sea. He throws a stone vertically upwards with a velocity of [tex]5 \, \text{ms}^{-1}[/tex]. The stone eventually lands in the sea. If air resistance is negligible, what is the time taken for the stone to reach the sea after leaving the man's hand?

[Done] When evaluating promotional claims, it is important to: A. do your own research B. ask if it makes sense C. determine if there are other possible solutions D. all of the above

[Done] How does friction affect brick structures?

[Done] When you look at green dots with a red filter, what color do you see?