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A molecule of DNA (deoxyribonucleic acid) is 2.26 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.06% upon becoming charged. Determine the effective spring constant of the molecule.
a 0.40kg basketball is thrown horizontally against a board with a velocity of 20m/sec. If the ball rebounds with a speed of 15m/sec. What is the impulse of the ball
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.7 m/s. The car is a distance d away. The bear is 30 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the m..
A 110 grams sample of water at 30 degrees Celcius is heat to steam at 130 degrees Celcius. how much heat is absorbed
The random noise level of a buzzing mosquito is 32dB and that heard in a typical classroom is 71dB. How many mosquitos are required to make a noise level equivalent to that heard ina typical classroom
Two tugboats pull a disabled super tanker. Each tug exerts constant force of 1.20 multiplied by 106 N, one 19° west of north and the other 19.0° east of north, as they pull the tanker 0.69 km toward the west. What is the total work they do on supe..
Consider an airless, non-rotating planet of mass M and radius R. Calculate the ratio h/R of the projectile's maximum height to the planet's radius
a baseball pitcher throws a fastball across home plate. the ball crosses the plate, calculate the speed of a baseball that takes .010 s to cross home plate, .30 m from front to back
A fictional spaceship accelerates at a constant rate of 0.107 m/s2. What would be its final velocity
The temperature of the surface of a certain star is 7500K. Most hydrogen atoms at the surface of star are in the electronic ground state. What is the approximate fraction of hydrogen atoms that are in the first excited state (and therefore could e..
If an automobile rounds this curve at 30 {rm m/s}, illustrate what is the minimum coefficient of static friction between tires and road needed to prevent skidding?
Resistances of 2.9 ?, 4.5 ?, and 6.8 ? and a 17.1 V battery are all in series. Find the potential difference across the first (2.9 ?) resistor.
a force of 40.0 n is required to start a 5.0-kg. box moving across a horizontal concrete floor.a what is the
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