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Molecule of DNA (deoxyribonucleic acid) is 2.23 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 1.19% upon becoming charged, and remains in this equilibrium position. Decide the effective spring constant of the molecule. Show Work
A car of mass M= 900-kg travelling at 45.0 kmh enters a banked turn covered with ice. The road is banked at an angle, and there is no friction between road and car's tires.
Record the resistance and current values calculated in questions 5, and load the numbers into a spreadsheet. Make a plot of the current I as a function of the total resistance R. (Remember that the R values will go on the x-axis and the I values o..
Two identical spheres each carry a charge of -40.0 µC. The spheres are separated by a distance of 1.00 m. What is the electric force between the spheres
a block starts at rest and slides down a frictionless track. the acceleration of gravity is 9.81 ms2. it leaves the
how much energy in j is dissipated as heat during a 2 minute time interval by a 1.5 kilo ohm resistor that has a
The volume flow rate in an artery supplying the brain is 4.20 10-6 m3/s. Find the average blood speed at a constriction in the artery if the constriction reduces the radius by a factor of two
q1. a mountain climber in the process of crossing between two cliffs by a rope pauses to rest. she weighs 550 n. as
An electron and a anti-electron (Positron) circle eachother at a distance of 1.00x10^-19m. What is the electrostatic force between the particles
A student sits on a rotating stool holding two 3.0 kg objects. When his arms are extendedhorizontally, the objects are 1.0 m from the axis of rotation, Find the new angular speed of the student
An object gets a variable acceleration (in m/s2) that changes with time according to the equation: a(t)= 5.0-1.4t 0
A skier starts from rest at the top of a 42m hill, skis down a 43 degree incline in to a valley, and continues up a 24 m high hill. (Neglect friction and the effect of the ski poles) What is the speed of the skier at the top of the second hill?
A 1130 kg car traveling initially with a speed of 25.60 m/s in an easterly direction crashes into the back of a 9 550 kg truck moving in the same direction at 20.0 m/s. What was the velocity of the truck right after the collision
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