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Why do seed plants not depend on water for reproduction?
If the projectile rises to a maximum height of only 14.7 m, determine the magnitude of the average force due to air resistance.
What hypotheses do scientists provide for how multicellular algae arose?
A 0.142kg baseball traveling 47.4m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backward 10.5cm. What was the magnitude of the average force applied by the ball on the
Why the leaves of plants appear green to the human eye?
You hang the rod vertically and attach a 105 kg mass to the bottom, and you observe that the bar becomes 1.01 cm longer. Calculate the effective stiffness of the interatomic bond, modeled as a "spri
Write a 1,400- to 1,750-word paper assessing the ecological property you chose for your final paper. Identify the ecological uniqueness of the plant and animal life in your chosen property and address
A 49 kg child sits in a swing supported by two chains, each 2.8 m long. The acceleration of gravity is 9.8 m/s2 . If the tension in each chain at the lowest point is 288 N, find the child's speed at
Find the speed of a satellite moving around the earth in a circular orbit that has a radius equal to six times the earth's radius of 6.38 106 m. Find the satellite's orbital period.
10 identical springs are placed side-by-side (in parallel), and connected to a large massive block. The stiffness of the 10-spring combination is 3500 N/m. What is the stiffness of one of the indiv
Which of the following factors that sometimes play a role in the rise of sap in the xylem depends on the expenditure of energy by the plant?
A kayaker needs to paddle north across a 100m wide harbor. The tide is going out, creating a tidal current that flows east at 2.0m/s. The kayaker can paddle with a speed of 3.0m/s.
Two pieces of plastic, a full ring and a half ring, have the same radius and charge density (charge per length). Which electric field at the center has the greater magnitude? Defend your answer.
When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.43 m. Calculate the horizontal distance the ball would travel if the same spring were aimed 25.0o from the
What is the magnitude of the torque exerted by the entire flagpole at the point
List the systems that either evolved by piggybacking on the ones above or evolved to compensate for potential problems caused by the systems that had to evolve to support cellular respiration.
a motor boat haeds due east at 5.0 m/s acorss a river that flows toward the south at 5 m/s. If the river is 125m wide, how longs does it take the boat to cross the river?
What is the terminal speed for an 84.0 skier going down a 44.0 snow-covered slope on wooden skis = 0.060?
After 2.10 s, the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground?
A 19 g rifle bullet traveling 210 m/s buries itself in a 3.4 kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal compo
The type of RNA that carries the coded message (from DNA) which speifies the sequence of amino acids that will form the protein is called?
A 46.8 kg girl is standing on a 169 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a co
A projectile is fired horizontally from a gun that is 57.0 m above flat ground, emerging from the gun with a speed of 180 m/s. (a) How long does the projectile remain in the air? (b) At what horizo
Which of the following statements best describes the end result of bacterial conjugation?
Explain the importance of a universal standard in measurement. Elaborate your answer in terms of metric system and conversions