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A freight train has a mass of 1.5 × 107 kg. If the locomotive can exert a constant pull of 7.9 × 105 N, how long does it take to increase the speed of the train from rest to 88 km/h?
___min
hree uniform meter sticks, each of mass , are placed on the floor as follows: stick 1 lies along the axis from = 0.210 m to = 1.21 m, Calculate the location of the center of mass of the meter sticks
Neglect air resistance during the descent. She comes to rest 3.00 m under the surface of the water. Identify the average force that the water exerts on the diver. This force is nonconservative.
Throughout liftoff, a hot-air balloon accelerates upward at a rate of 3m/s^2. The balloonist drops an object over the side of the gondola when the speed is 13m/s.
Suppose we know that an electron in an excited state has a tangential velocity (v = 3.65 x 10^5 m/s), What is the radius of this orbit
A soccer ball is kicked from the ground at an angle of ? = 60 degrees with respect to the horizontal, What is the total horizontal distance, (dm), in meters, traveled by the ball in the time, tm
Calculate Escape Velocity for Mars (mass = 6.42 x 1023 kg, radius = 3397km). Is it easier to launch a rocket from Mars than the Earth
A hoodlum throws a stone vertically downward with an initial speed of 12.2 m/s from the roof of a building, 25.0 m above the ground. What is the speed of the stone at impact
Two concentric metallic spheres of radii r1 and r2> r1, respectively, are maintained at temperatures T1 and T2, and are separated by a layer of homogeneous material thermal conductivity k.
Start from the expression of the electric filed outside an infinite sheet of uniform surface charge density, E=sigma/2epsilon, derive the electric field
John's face is 20 cm in front of a concave shaving mirror of focal length 30 cm. How large an image does he observe
A beam of protons, each with kinetic energy 40 MeV, approaches a step potential of 30 MeV. What fraction of the beam is reflected and what fraction transmitted
A baseball is hit with a speed of 30ms-1 at an angle of 40degrees. It land`s on the flat roof of a nearby building with a height of 14 m. If the ball was hit when it was 1.40 m above the ground, what horizontal distance does it travel before it la..
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