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A train at rest emits a sound at a frequency of 1000 Hz. Anobserver in a car travels away from the sound source at a speed of30.0 m/s. What is the frequency heard by the observer?
Identify the magnitude and direction of the electric field at a point midway between a -8.0 uC and a +5.8 uC charge 8.0 cm away. Assume no other charges are nearby.
If 3.00 multiplied by 10-3 kg of gold is deposited on the negative electrode of an electrolytic cell in a period of2.75 h, what is the current in the cellduring that period? Assume the gold ions carry one elementary unitof positive charge.
A storage tank has a diameter of 80 ft, a height of 25 feet, andcontains oil to a height of 15 ft. The suction pumps, whichcan handle 15, 000 bbl/d are started, but the safety valves areclogged and a vacuum is drawn in the tank. The roof is flatan..
A 4.4 cm tall object is placed 27 cm in front of a convex spherical mirror. Find the distance, di, of the image (cm), the focal length of the mirror (cm), and the radius of curvature of the mirror (cm)
A student standing on the ground throws a ball straight up. How long is the ball in the air before it hits the ground
A horizontal force F{x} =F0 (1-t / T), which decreases from F0 at t =0 to zero at t =T, is exerted on the object. Find an expression for the object's velocity
A square plate has a side length of 1.2 m. An applied torque of 300 N•m gives the plate an angular acceleration of 4.8 rad/s2 about an axis through the centre of the plate
After crossing the finish line, the marathon runner stops, and then performs a celebratory vertical jump. what was the avg. force of the vertical ground reaction force
A boat with a horizontal tow rope pulls a water skier. how much work does the rope do on the skier during a forward displacement of 270m
A hypodermic syringe contains a medicine with the density of water, Determine the medicine's flow speed through the needle
Ice at 0.0 degrees Celsius has a density of 917kg/m3. A 3.00cm3 ice cube is gently released inside a small container filled with oil and is observed to be neutrally buoyant. What is the density of the oil
A gun shoots a 5.00 gramsbullet with a horizontal velocity of 1000m/s. the bullet strikes atree and penetrates to a depth of 10.0 meters. find the mechanicalenergy lost to friction in bringing the bullet to rest.
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