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In the early 1900 second, Robert Millikan used small charged droplets of oil, suspended in an electric field, to make the first quantitative measurements of the electron's charge. A 0.70 micrometer diameter droplet of oil, having a charge of +e, is suspended in midair between two horizontal plates of a parallel-plate capacitor. The upward electric force on the droplet is exactly balanced by the downward force of gravity. The oil has a density of 860 kg/m3, and the capacitor plates are 4 millimeter apart.
Find what must the potential difference between the plates be to hold the droplet in equilibrium?
Calculate the gravitational force between Sun and Earth by using Newton's universal gravitation, Does this mean that everything on Earth is heavier at night
q1. a 48-m length of wire is stretched horizontally between two vertical posts. the wire carries a current of 64 a and
Neutron stars consist only of neutrons and have unbelievably high densities. Find the density of such a star
The magnitude of the electrostatic force between two identicalions that are separated by a distance of 5.0x10 ^ -10 m is 3.7x10^-9N , How many electrons aremissing from each ion
A constant force is applied to an object, causing the object to accelerate at 10m/s2. obtain what will the acceleration be if the force is halved
energy may be stored for use during peak demand by pumping water to a high reservoir when demand is low and then
A hollow sphere of inner radius 7.2 cm and outer radius9.2 cm floats half-submerged in a liquid of density 900kg/m3. What is the mass of the sphere
A car is travelling with a velocity of + 88.0 km/h. It accelerates at a constant rate of 20 m/s2. If the acceleration lasts for 5.6s, what is the final velocity of the car.
A convex mirror has a focal length of -48.0 cm. A 12.0-cm-tall object is located 36.0 cm in front of this mirror. Using a ray diagram drawn to scale, determine the location of the image. Note that the mirror must be drawn to scale
An electric generator contains a coil of N turns of wire, each forming a rectangular loop of area A. What is the maximum value of the emf (?max) produced when the loop is spun at angular speed
Pulling a car from a ditch, To pull a car from a ditch, the driver ties one end of a rope to the car and the other to a tree 12.5 m away.
The force involved in a collision is 1.0 × 10^2 newtons. What is the value of the change in momentum
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