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A swimming duck paddles the water with its feet once every 1.8sec,producing surface waves with this period. The duck is moving at aconstant speed in a pond where the speed of surface waves is .32m/s, and the crests of the waves ahead of the duck are spaced .18mapart.
a) What is the duck's speed?
b) How far apart are the crests behind the duck?
The concrete wall of a building is 0.136 m thick. The temperature inside the building is 22.3 °C, while the temperature outside is 0.0 °C. What is the emissivity of the wall
A child stands at the rim of a rotating merry-go-round of radius 2.8 m. The child has a mass of 51.0kg, and the carousel turns with an angular velocity of 2.3 rad/s. What minimum coefficient of static friction is required
Two circular plates of radius 5.22 cm possess a charge separation of 8.252 ?C. find the electric field between the two plates
Draw a free body diagram for the skydiver in the instant after he jumps.(Assume that at this point his velocity is near zero so that air resistance is still negligible.)
question1calculate approximately the average power of a water wave when it hits chest of an adult standing in the water
Diagnostic ultrasound offrequency 4.9 MHz is used to examine tumors in soft tissue. What is the wavelength in air of such a sound wave
The top of a swimming pool is at ground level. If the pool is 2.46 m deep, how far below ground level does the bottom of the pool appear to be located for the following conditions? (a) The pool is completely filled with water. m below ground level (b..
A seagull flies at a speed of 10m/s directly into the wind. Knowing that it takes the bird 25 min to travel 8km relative to the earth, find the velocity of the wind. How long will it take the seagull to travel a distance of 12km with the wind?
A 20 g ball is fired horizontally with initial speed v_0 toward a 110 g ball that is hanging motionless from a 1.10 m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle t..
A 318 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 624 mmHg. compute the moles of Ar present.
An 8.0 m, 100 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.40, what is the minimum angle that ladder can make with the floor before it slips.
A football game begins with a kickoff in which the ball travels a horizontal distance of 45 yd and lands on the ground. what is the initial speed of the ball in this case
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