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Q. A dolphin located in seawater at a temperature of 25°C emits a sound directed toward the bottom of the ocean 200 m below. How much time passes before it hears an echo?
Q. A billiard ball moving east at 5.00m/s strikes a stationary ball of the same mass in a toatlly elastic collion. after the collison the fisrt ball moves at 4.33 m/s at an angle of 30.0 degrees north of east. find the velocity of the second ball after the collision.
What must be the temperature of the cold reservoir in order to increase the efficiency to 29.0%
Find the resulting angular speed of the disk (in rad/s) and describe the direction of rotation.
A box weighing 300N is shoved across the floor of an apartment by a force of 400 N exerted downward at an angle of 35.2° below the horizontal. If the coefficient of kinetic friction between the box and the floor is 0.540, how long does it take to mov..
An electric motor rotating a workshop grinding wheel at a rate of 93 rev/min is switched off. Assume the wheel has the constant negative angular acceleration of magnitude 2rad/s2.
A train is travelling up a 5.0 degree incline at a speed of 2.25m/s when the last car breaks free and begins to coast without friction. a) How long does it take for last car to come to rest momentarily? b) How far did the last car travel before mo..
The small piston of a hydraulic lift has a cross-sectional area of 3 cm2, and its large piston has a cross-sectional area of 200 cm2. What force should be applied to the small piston for the lift to raise a load of 15kN
In the meantime, the velocity of airplane Q relative to the air is 250 m/s in the direction of N 20o W. What is the speed of airplane Q relative to the airplane P.
Speedboat A negotiates a curve whose radius is 198 m. Speedboat B negotiates a curve whose radius is 290 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
Three deer, A, B, and C, are grazing in a field. Deer B is located 64.4 m from deer A at an angle of 53.8 ° north of west. Deer C is located 76.2 ° north of east relative to deer A. The distance between deer B and C is 96.8 m. What is the distance be..
Find the surface tension force on water inside a tube and height to which the water rises in the tube.
Five people are playing tug-of-war. Anders and alyson pull to the right with 44 N and 34 N, correspondingly. Calid and Marisol pull to the left with 55 N and 35 N, respectively. With what force and in what direction does Benito pul of the game is tie..
The yellow light from a helium discharge tube has a wavelength of 587.50. When this light illuminates a certain diffraction grating it produces a first-order principal maximum at an angle of 1.050.
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