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Stretching DNA. With its double-helix structure, DNA is coiled like a spring. A biophysicist grabs the ends of a DNA strand with optical tweezers and stretches it 26 nanometers producing 1.2-pN tension in the strand.
Part A What's the DNA's spring constant? Express your answer to two significant figures and include the appropriate units.
if you decrease the hanging mass by a factor of four( 0.55 kg/4) but keep the linear mass density the same, by what factor does the fundamental frequency change
An air-filled parallel-plate capacitor has plates of area 2.50 cm2 separated by 2.00 mm. The capacitor is connected to a 3.0-V battery, What is the magnitude of the uniform electric field between the plates
When you push a 1.95kg book resting on a tabletop it takes 2.50N to start the book sliding. Once it is sliding, though, it takes only 1.50N to keep the book moving with constant speed. What are the coefficients of static and kinetic friction betwe..
A small object, which has a charge q = 5.6C and mass m = 5.4 x 10-5 kg, is placed in a constant electric field, Determine the magnitude of the electric field
Starting from rest, a 6.00-kg block slides 3.00 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is ?k = 0.436. Determine the work done by the force of gravity
A warehouse worker pushes a crate along the floor, by a force of 5.0N that points downward at an angle of 45° below the horizontal. find the horizontal component of the push.
A +19nC charge is located at the origin. What is the electric field at the position (x1,y1)=(5.0cm,0cm)? Write electric field vector in component form
A block of iron has the dimensions of 3.00 cm x 3.00 cm x 3.00 cm. It has a mass of 213 g. When placed in water, the block sinks. What volume of water did it displace.
The 50 cm tall object(arrow) is located 75 cm away from the diverging lens plane ( focal length 50 cm). Calculate the distance to the image of the object
Starting from rest, a 5.4-kg block slides 2.10 m down a rough 30.0° incline. Determine the work done by the force of gravity
Water at 20.0 °C is sprayed onto 0.236 kg of molten gold at 1063 °C (its melting point). What is the minimum mass of water that must be used
An electron moves through an electric field, and its speed drops from 2200m/s to 1000m/s, what's the potential difference between the points at which the speed was measured
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