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Does the resistivity of a material depend on its length or cross-sectional area? Does the resistance depend on the lenghtr or cross-sectional areas? Explain.
Part A-Power lines carry electricity at about 120,000 volts. If a power line were stepped down by a transformer to 120 volts, how many turns would there be on the secondary coil if there were 1000 turns on the primary? Show calculations. Part B-If..
Car is traveling at constantspped, passes a car stopped, it accelerates at 7m/s2 , what is final velocity of originally stopped car
A stone is dropped from the top of the cliff. The splash it makes when striking the water below is heard 3.5 seconds after it is dropped. How high is the cliff? Presume that the speed of sound in air is 343 m/s and g = 9.8 m/s2.
The acceleration of a particle is given by ax(t)=? 1.90m/s2 +( 2.90m/s3 )t, Find the initial velocity v0x such that the particle will have the same x-coordinate at time t= 4.04s
A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, What is the speed and direction of the third piece
A physics professor is pushed up a ramp inclined upward at an angle 31.0 above the horizontal as he sits in his desk chair that slides on frictionless rollers. The combined mass of the professor and chair is 90.0 . He is pushed a distance 2.85along t..
an iron boiler of mass 230 kg contains 900 kg of water at 23degc. a heater supplies energy at the rate of 51500 kjh.how
From rest, a 26.7 kg child is sliding down a 5.12 meter long playground slide in a time of 1.98 seconds. Calculate the value of kinetic friction
A 23 bullet traveling 245 penetrates a 3.0 block of wood and emerges cleanly at 195 .If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges.
An electromagnetic wave with frequency 56.0 Hz travels in an insulating magnetic material that has dielectric constant 3.72, What is the speed of propagation of the wave
A hockey puck slides over ice with ?k = 0.013. What initial speed should the puck have so it travels the 40m length of the rink
Cheetahs, fastest of the great cats, can reach 45 in 2 starting from rest. Assume that they have constant acceleration throughout that time, find their acceleration (in (a) and (b) ) and the distance (in (c) and (d) ) Q2. They travel during that t..
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