a turtle crawls along a straight line, which we will call the x-axis with the positive direction to the right. the equation for the turtle’s position as a function of time is x(t) = 50.0 cm + (2.00 cm/s)t - (0.0625 cm/s^2)t^2. (a) find the turtle’s initial velocity, initial position, and initial acceleration. (b) at what time t is the velocity of the turtle zero? (c) how long after starting does it take the turtle to return to its starting point? (d) at what times t is the turtle a distance of 10.0 cm from its starting point? what is the velocity (magnitude and direction) of the turtle at each of those times?+

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.

Which of the following statements comparing electron microscopy and light microscopy is false? which of the following statements comparing electron microscopy and light microscopy is false? both the electron microscope and the light microscope use the same wavelengths for illumination. images produced by light microscopes can be in color, whereas electron microscope images are black and white unless they are artificially colored. the electron microscope has greater resolution than the light microscope. electron microscopes can allow examination of viruses and internal cell structures, whereas light microscopes are limited to objects that are 0.5 micrometers and larger. request answer

Select the best definition for wavelength. the height of an oscillating electromagnetic wave the rate at which electromagnetic waves oscillate. the distance between two crests of an electromagnetic wave. the oscillations of electric and magnetic fields select the best definition for frequency. the oscillations of electric and magnetic fields. the height of an oscillating electromagnetic wave. the distance between two crests of an electromagnetic wave. the rate at which electromagnetic waves oscillate