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A freight train has a mass of 1.8 x 107 kg. If the train can exert a constant pull of 7.8 x 105N, find how long does it take to increase the speed of the train from rest to 74 km/h?
Describe what happens (in terms of the electron wave functions) when you bring together a bunch of copper atoms to form a solid block of copper, how the electrons are filled in these energy levels
A 3.5 kg block is released from a compressed spring whose spring constant is 640N/m. After leaving the spring at the spring’s relaxed length, the block travels over a horizontal surface by a coefficient of friction of 0.25, for distance of 7.8mcoming..
Runner A is initially 1.0 mi west of a flagpole and is running with a constant velocity of 8.0 mi/h due east. How far are the runners from the flagpole when they meet
A boat moves through the water of a river at 10.0 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 1.5 m/s, how long does it taket he boat to make a round trip consisting of a 300 m displacemen..
A proton is moving through a magnetic field of strength 2 kT with a speed of 2.5*10^8 m/s, what is the angle between the proton's velocity and the direction of the field
What friction torque is required to reduce its angular speed from 80.0 to 51 in 27.
Suppose a 0.250-kg ball is thrown at 15.0 m/s to a motionless person standing on ice who catches it with an outstretched arm, Calculate the final linear velocity of the person
two coaxial cylindrical conductors . the inner cylinder has radius a 2 cm length 10 m and caries a total charge of
an infinitely wide and an infinitely thin insulating plane has a uniform surface charge density of 3.5 ncm2. what are
The light shining on a diffraction grating has a wavelength of 457 nm (in vacuum). How many lines per centimeter does the grating have
A satellite of mass M = 270kg is in circular orbit around the Earth at an altitude equal to the earth's mean radius (6370 km). What is the gravitational force on the satellite
an object weighs 30 n. how would you explain this statement according to what you know about mass and acceleration due
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