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A molecule of DNA (deoxyribonucleic acid) is 2.28 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 1.04% upon becoming charged. Determine the effective spring constant of the molecule.
A stone thrown horizontally from a height of 5.72 m hits the ground at a distance of 13.50 m. Calculate the speed of the stone as it hits the ground
Two 1.7 kg masses are 2.0 m apart (center to center) on a frictionless table. Each has +1.0 µC of charge. What is the magnitude of the electric force on one of the masses
A 109 V potential difference is applied to a space heater whose resistance is 12 when hot. At what rate is electrical energy transferred to heat
A Dodge car of mass 1103 kg traveling to the right at 22.40 m/s collides head-on with a Ford of mass 1258 kg traveling at the same speed but in the opposite direction. Calculate its final speed the moment after the collision
How much charge is applied to each of the cylinders.
A hotel elevator ascends 140 m with a maximum speed of 5.80 m/s. Its acceleration and deceleration both have a magnitude of 1.50 m/s2.
Objects with masses of 210 kg and a 510 kg are separated by 0.300 m. Find the net gravitational force exerted by these objects on a 31.0-kg object placed midway between them
A photographer uses his camera, whose lens has a 60mm focal length, to focus on an object 2.5m away. How far must the lens move to focus on this second object
The attractive electrostatic force between the point charges 7.35x10^-6C and Q has a magnitude of 0.400N when the separation between the charges is 2.92m. Find the sign and magnitude of the charge Q.
A charged oil droplet falls 5.0 mm in 20.0 s at terminal speed in the absence of an electric field. What are the mass and radius of the drop
26 g of copper pellets are removed from a 300 degree Celsius oven and straight away dropped into 116 mL of water at 25 degree Celsius in an insulated cup. What will the new water temperature be.
find the net rate of radiation by a pot at 35.7°C that has been placed in a -23.9°C freezer. The pot's surface area is 0.111 m2 and its emissivity is 0.655.
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