Critiquing Scientific Writing QUICK CHECK Read the passage below, then answer the questions to the right Which statement is one of fact supporting how pH and flower color are related? DONE Hydrangeas are a type of plant whose flower clusters can be as large as your head. The flower color can be changed by altering the pH of the soil. Acidic soil produces pink flowers and neutral or slightly basic soil produces deep blue flowers. An experiment was conducted growing 20 hydrangeas using soil with a pH of 4-5 (acidic) and another 20 in soil with a pH of 7.0 (neutral). Plant Acidic (pH = 4.5) Neutral (pH = 7.0) Which statement is one fact supporting how pH and flower color are related?

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Which accurately compares concave and convex lenses?

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.