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Questions in physics

[Open]A water skier has a mass of 68 kg. Calculate the resultant force acting on the water skier while accelerating.

[Open]How does oil between machine parts reduce friction?

[Open]A Christmas tree's lights are set up in series. 1. A set of lights has 50 bulbs. What will be the voltage across each bulb? Show your work.

[Open]What is the freezing point of copper?

[Open]Describe an application where a parallel circuit might work better than a series circuit.

[Open]Which of these types of images is not possible with a diverging mirror? A) An image that is smaller than the object B) An inverted image C) A virtual image D) An image

[Open]What does an unconformity in a sequence of rock layers reveal about geologic history? A. A rock layer must have turned upside down. B. A layer of rock might have eroded. C. The layers must cover hundreds of square miles. D. The layers must have been deposited very quickly.

[Open]Acceleration is sometimes expressed in multiples of [tex]g[/tex], where [tex]g = 9.8 \, \text{m/s}^2[/tex] is the acceleration due to gravity. In a car crash, the car's velocity changes from [tex]30 \, \text{m/s}[/tex] to [tex]0 \, \text{m/s}[/tex] in [tex]0.15 \, \text{s}[/tex]. In terms of [tex]g[/tex], what is the acceleration of the car?

[Open]What are three uses of infrared radiation?

[Open]What force is necessary to accelerate a 1250 kg car at a rate of 40 m/s\(^2\)?