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If the buoyant force on a submerged object is less than the weight of the object, how do the densities of the object and water compare?
Given the wavefunction of a standing wave: y(x,t) = A sin(πx)cos(2πt), where x and y are in meters and t is in seconds. The position of the second anti-node from the end x = 0 is at:
Prove that dispersive power is always positive?
A stone is thrown upward and reaches a height of 19.6 meters. With what initial velocity was it thrown?
When a car is running with a velocity of 50 m/s, it is given a constant acceleration of 5 m/s². Find the displacement of the car 2 seconds later.
The height of a cylindrical tank, containing 20 lb of gas at 70 psia and 115 Farenheit, IS TRIPLE ITS DIAMETER; the gas constant is R = 45 ft lbf/lbm R. find.
A truck driver is driving at a velocity of 60 km/h. He sees a danger ahead and steps on his brakes. He stop the truck in exactly 5 seconds. How far does he go before coming to a stop?
A sample of hydrogen atoms is irradiated with light with wavelength 85.5 nm, and electrons are observed leaving the gas.
(a) If each hydrogen atom were initially in its ground level, what would be the maximum kinetic energy in electron volts of these photoelectrons?
(b) A few electrons are detected with energies as much as 10.2 eV greater than the maximum kinetic energy calculated in part (a). Explain.
Consider a series circuit including a 4Ω, a 16mH-inductor, and a power supply of 9 volts.
How many times constant does it take for the current to reach 99.9% of its final value?
- a Calculate the force between two charges q1 of
2.0 μC and q2 4.0 μC separated by r = 5.0 cm. (Ans: 29 N)
b Let the force calculated in a be F. In terms of F
and without further calculations, state the force
between these charges when:
i the separation r of the charges is doubled (Ans: F/4)
ii q1 and r are both doubled (F/2)
iii q1, q2 and r are all doubled. (F)
Please explain how these problems were solved.
#339914 on Dec 2023