Acar drives around a racetrack for 30 seconds. what do you need to know to
calculate the average speed of the car?

a. the slope of the car's position-time graph

b. the total distance driven on the racetrack

c. the area under the position-time graph

d. the slope of the car's velocity-time graph
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The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm(red) and 486 nm (blue). light from a hydrogen lamp illuminates a diffraction grating with 520lines/mm , and the light is observed on a screen 1.5m behind the grating. part a what is the distance between the first-order red and blue fringes? express your answer to two significant figures and include the appropriate units.

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j

What are the dimensions of the cross section that passes through the points a, f, g, and d?