If you double the wavelength of a wave on a string, what happens to the wave speed and the wave frequency ? group of answer choices a) v is unchanged and f is halved. b) v is doubled and f is doubled. c) v is doubled and f is unchanged. d) v is unchanged and f is doubled. e) v is halved and f is unchanged.

The car hoist allows the car to be driven onto the platform, after which the rear wheels are raised. if the loading from both rear wheels is 1380 lb, determine the force in the hydraulic cylinder ab. neglect the weight of the platform itself. member bcd is a right-angle bell crank pinned to the ramp at c. the force is positive if in tension, negative if in compression.

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

The earth is constantly spinning on its axis, like you might spin a basketball on your finger. it is this spinning of the earth that causes