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The earth's radius is 6.37×106m; it rotates once every 24 hours. What is the earth's angular speed? Viewed from a point above the North Pole, is the angular velocity negative and positive? What is the speed of a point on the equator? What is the speed of a point on the earth's surface halfway between the pole and the equator? (Hint: what is the radius of the circle in which the point moves?)
Calculate the energy needed to accelerate a spaceship with a mass m = 25 × 103 kg toa speed of 0.40c. Compare this number with the approximate annual energy usage ofEarth, 1021 J
Two sinusoidal waves, identical except for phase, travel in the same direction along a string producing a net wave y'(x, t) = (2.5 mm) sin(17x - 4.0t + 0.840 rad), with x in meters and t in seconds. (Assume that the phase constant for one of the i..
An air duct in a building has a radius of 8 cm and a length of 17 m. What pressure is required to push air through the duct at a flow rate of 1.1 m3/s
A horizontal pipe carries a easily flowing liquid with density 1.19 × 103 kg/m3. At locations 1 and 2 along the pipe the diameters are 6.41 cm and 2.61 cm, respectively. Is the flow speed at location 2 higher or lower than at location 1?
An electron gun in an old television picture tube is a device that uses an electric field to accelerate electrons. What magnitude of electric field is needed to accelerate an electron from rest to a speed of 4.0x10^7 m/s in a distance of .01m.
Find the size of the net force produced by a 7 N and an 12 N force in each of the following arrangements. (a) The forces act in the same direction. N= (b) The forces act in opposite directions. N= (c) The forces act at right angles to each other. ..
The speed of the fastest pitched baseball was 45 m/s and the ball's mass was 145g. how many joules of kinetic energy did it have
Three point charges are located on the x-axis. The first charge q1 = 10.0μC at x =1.0m; the second charge, q2 =20.0μC, is at the origin, and the third charge is q3=30.0μC is located at x =2.00m. Decide the potential energy of this arrangement
An engine moves a boat throughthe water at a constant speed of 15 m/s. What power does the engine develop
two point charges are on the y-axis. a 5.5 microc charge is located at y 1.15 cm and a -2.26 microc charge is located
A nonzero net force acts on a particle and does work. Which one ofthe following statements is true? The kinetic energy of the particle changes, but the velocity of theparticle does not change. The kinetic energy, speed, and velocity of the particlech..
The generator in an AC inductor circuit creates a maximum potential difference across the 2.74×10?3 H inductor of 243 V. What is the amplitude of the alternating current
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