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A copper wire has a resistance of 10.0 ?. At what point along its length must the wire be cut so that the resistance of one piece is 4.0 times the resistance of the other? What is the resistance of each piece?
Sam's circuit has a 24 Ω resistor that is connected in series to two 12 Ω resistors that are connected in parallel. find the value of JoAnna's resistors
Suppose you have a resistor R1=10 Ohms tied in a series with a parallel combination of two resistors R2=10 Ohms and R3=5 Ohms. What is the total resistance of this circuit? What is the total current during the battery if the battery supplies 9V?
A house painter stands 3 m above the ground on a 4.9-m-long ladder that leans against the wall at a point 4.7 m above the ground. find the force of friction that the driveway exerts on the bottom of the ladder
If the football has the mass of .420 kg and the time of contact with the ball is .014 s, what is the force exerted by the ball on a kicker's foot.
(a) What is the kinetic energy change for the system? (b) Is the collision elastic or inelastic?
An energy of 39 joules is stored in a metal sphere. If a sparkcarrying 3 x 10-4 C discharges the metal sphere, find the sphere's electric potential before the discharge
When it rains water vapour in the air condenses into liquid water and energy is released. How much energy is released when 0.0244m of rain falls over an area of 2.59 x 10^6 m^2? If the average energy needed to heat one home for a year is 1.40 x 10^11..
a van de graaff generator has a dome of radius 2.0 m. a motor causes a charged insulating belt to travel continuously
An air-track glider of mass 0.100 kg is attached to the end of a horizontal air track by a spring with force constant 20.0 N/m. How large would the coefficient of static friction have to be to keep the glider from springing back to the left when it ..
A simple pendulum consists of a small object of mass 3.0 kilogram hanging at the end of 2.0 meter long light string that is connected to a pivot point. Find the magnitude of the torque (due to the force of gravity) about this pivot point
a particle has a velocity u 0.84c in the labortory. the laboratory is itself moving with velocity v 0.77c relative to
Two plane mirrors are placed parallel to each other 20 cm apart. A luminous object is placed betweenthem 5 cm from one mirror. Determine the distance from each mirror of the three nearest images in eachmirror.
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