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Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 3781 kg), which is made of steel (? = 7850 kg/m3). In typical comic-book fashion, they decide to raise the yacht (which is now on the bottom of a lake) by filling it with ping-pong balls. A ping-pong ball has a mass of 2.70 g and a volume of 3.35·10-5 m3.
a) What is the buoyant force on one ping-pong ball in water?b) How many balls are required to float the ship?
Find the weight of the hanging mass when the spring, with spring constant 15.5 kN/m , has been stretched 15.1cm
A uniform upward directed electric field of magnitude 1.4*10^-6 N/C has been setup between tow horizontal plates by charging the lower plate positively abnd the lower plate negatively, what is the vertical deflectio of the mass when it exits the pl..
Two moles of a monatomic gas with an rms speed of 294 m/s are contained in a tank that has a volume of 0.12 m3. If each gas particle has a mass of 8.220 × 10–26 kg, what is the absolute pressure of the gas?
Two 4.0-g spheres are suspended by 9.0-cm-long light strings. determine the electric field intensity that enables the spheres to be in equilibrium at ? = 12°
a pelican flying along a horizontal path drops a fish from a height of 5.4m. the fish travels 8.0m horizontally before
A human hair is placed directly in front of the opening of a laser pointer. The light has a wavelength of 647.8 nm. Determine the approximate thickness of the hair
Two waves traveling on a string in the same direction both have a frequency of 141 Hz, a wavelength of .43 m, and an amplitude of .16 m. What is the phase difference between the two waves
Estimate the change in the Earth’s gravitational dipole moment, with respect to the Earth’s center, if the polar ice caps were to melt.
The space shuttle is in a 150km -high circular orbit. It needs to reach a 590km -high circular orbit to catch the Hubble Space Telescope for repairs. How much energy is required to boost it to the new orbit
A firecracker resting on a level street explodes into three pieces of equal mass. Immediately after the explosion, the first piece is moving north at 125 m/s, and the second piece is moving east at 75.0 m/sec. What is the velocity of the third piece ..
A bat flying in complete darkness emits high frequency sound of 100 kHz to locate objects. What is the frequency in which the bat is received
A brick of mass 1.21 kg is attached to a thin (massless) cable and whirled around in a circle in a vertical plane. What is the maximum speed the brick can have at the bottom of the circle before the cable will break
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