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a sphere is constructed of two concentric pieces. The inner part is a solid sphere of radiu 10.0 cm made of a material with density 4000 kd/m^3. What is the average density of this sphere
A 79-kg person is exposed to 83 mrem of α particles (RBE = 12). How much energy (in joules) has this person absorbed
A u-tube with a cross-sectional area of 1.00 cm^2 is open to the atmosphere at both ends. WAter is poured into the tube until the water rises part way along the straight sides, What is the density o
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -18.20 eV. What is the energy of the first photon emitted
A concave mirror has a focal length of 20 cm. What is the position (in cm) of the resulting image
A beam of hydrogen molecules (H2) is directed toward a wall, at an angle of 68 ° with the normal to the wall. What is the beam's pressure on the wall
A submarine is 300. m horizontally out from the shore and 100m. beneath the surface of the water. How long does it take for the laser bream to reach the building
Take element Z = 21 from the periodic table. Ionize it 20 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the electron
Unpolarized light with an intensity of 980 W / m2 is incident on a polarizer with an unknown axis. What is the angle between the axes of the polarizers
Using the Bohr model what is the radius of the electron orbit in the Hydrogen atom when the electron is in the n = 2 state, What is the energy of the Hydrogen atom
An ideal gas at 13.6 °C and a pressure of 1.41 x 105 Pa occupies a volume of 3.90 m3. How many moles of gas are present
The nucleus 11-4 Be undergoes B- decay with a half-life of 13.8 sec. The atomic mass of 11-4 Be is 11.021660 u. What is the total kinetic energy of the decay products
The security alarm on a parked car goes off and produces a frequency of 1200 Hz. The speed of sound is 343 m/s. At what speed are you driving
A friend advised the owner of the bowl to keep it out of direct sunlight to avoid blinding the fish, which might swim into the focal point of the parallel rays from the sun. Is the focal point actua
Two thin lenses with a focal length of magnitude 10 cm, the first diverging and the second converging, are located 7.88cm apart. How far from this first lens is the final image formed
A photon with wavelength 0.02585 nm strikes a free electron that is initially at rest. find the kinetic energy of the electron after the collision
A 20 kg satellite has a circular orbit with a period of 2.4 h and a radius of 8.0 Ã- 106 m around a planet of unknown mass. what is the radius of the planet
Light of wavelength 517 nm is used to illuminate normally two glass plates 22 cm in length that touch at one end, How many bright fringes appear along the total length of the plates
If a constant force of 416 N acts in the direction opposite to the body's motion, how long must the force act to bring the body to rest
As observed from Earth, rocket Alpha moves with speed 0.814c and rocket Bravo travels with a speed of 0.638c. What is the speed of rocket Alpha
A uniform steel beam has a mass of 2070 kg. On it is resting half of an identical beam, What are the vertical support forces
We all know that your homes have primary voltage Vp 120V that comes to them, What type of transformer is needed to reduce the voltage
An air-track glider is attached to a spring. The glider is pulled to the right and released from rest att = 0. what is the amplitude of the ossilation
A 2kg uniform cyclinder is released at the top of a 1.53 m 11 degree incline. What is the velocity when it reaches the bottom
The Hall effect can be used to determine the density of mobile electrons in a conductor. Find the density of mobile electrons in the material