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When a potential difference of 12 V is applied to a wire 6.8 m long and 0.26 mm in diameter the result is an electric current of 3.0 A. What is the resistivity of the wire?
A new circus act features a large frictionless cannon with an 2500 N/m spring mounted at the bottom of a long barrel which makes an angle of 37.0o with the horizontal. Find the speed of the acrobat when he reaches the top of the barrel. Use energy ..
When cars are equipped with flexible bumpers, they will bounce off each other during low-speed collisions, thus causing less damage. What was the speed of the lighter car just after the collision
A mass is attached to a spring stretched 2.5 cm from equilibrium. What is the angular frequency of the oscillation
Raindrops fall 1400 m from a cloud to the ground. If they were not slowed by air resistance, how fast would the drops be moving when they struck the ground
You perform a double-slit experiment in order to measure the wavelength of the new laser that you received for your birthday. What is your laser's wavelength expressed in nanometers
A trolley that moves along a horizontal beam is acted upon by two forces as shown. (a) Knowing that a 5 25°, determine by trigonometry the magnitude of the force P so that the resultant force exerted on the trolley is vertical. (b) What is the cor..
A 150 g copper bowl contains 220 g of water, both at 20.0ºC. A very hot 300g copper cylinder is dropped into the water, What was the original temperature of the cylinder
the moon has an angular size of .5degrees when viewed with unaided vision from earth. what is the angular size of the moon as seen through this telescope
A train is travelling up a 4.5 degree incline at a speed of 3.25 m/s when the last car breaks free and begins to coast without friction. a) How long does it take for the last car to come to rest momentarily? b) How far did the last car travel befo..
When an open-faced boat has a mass of 5150 kg, including its cargo and passengers, it floats with the water just up to the top of its gunwales (sides) on a freshwater lake. What is the volume of the boat
A 1200 turn coil of wire that is 3.00 cm in diameter is in a magnetic field that drops from 0.750 T to 0 T in 15.0 ms. What is the induced emf in the coil
A child operating a radio-controlled model car on a dock accidentally steers it off the edge. What is the car's speed at the instant it drives off the edge of the dock
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