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Potassium has a work function of 2.21 eV. What is the maximum kinetic energy of electrons escaping from a sample of potassium if photons of frequency 6.00×1014 Hz strike it?
Small telescopes are often advertised as "200 power" or "magnifies 200 times." As someone knowledgeable about astronomical telescopes, how would you progress such advertisements.
the clarinet is well modeled as a cylindrical pipe that is open at one end and closed at the other. find the wavelength
An object is 17 mm in front of a converging lens, and the image is 3 mm behind the lens. What is the focal length of the lens? Reply In mm
A motorist drives south at 28.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.20 min, find the total vector displacement
Lets say you have a helicopter with 3 blades and eachblade is 5.20 m long and has a mass of 220 kg.The rotor is rotating at 325 rpm. What is the rotationalinertia of the rotor assembly about the axis of rotation?
A projectile projectile is fired at an upward angle of 45o from the top of a 265-m cliff with a speed of 185 m/s. What will be its speed when it strikes the ground below
a closed frictionless piston-cylinder assembly contains 4 lbm of h20. beginning with an initial volume of 10 ft3 the
An electric field of approximately + 100 V/m is often observed near the surface of the Earth. If this were the field over the entire surface of the Earth, What would be the magnitude and sign of the charge on the Earth? What would be the total electr..
A woman finds the front windshield of her car covered with ice at -12.0 °C. How much heat is required to melt the ice
the electric field midway between two equal but opposite point charges is 695 nc and the distance between the charges
An 815-kg race car can drive around an unbanked turn at a maximum speed of 61 m/swithout slipping. The turn has a radius of curvature of150 m. Air flowing over the car's wing exerts a downward-pointing force (called the downforce) of2500 N on the ..
An object with a mass of 500g is attached to a spring. The system is moving in simple harmonic motion with an amplitude of 0.020m, What is the frequency of the system
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