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-Discuss why technetium and promethium have whole number atomic masses and have a bracket symbol on the periodic table.
-Variations in average atomic mass may be observed for elements obtained from different sources. Lithium provides an example of this. The isotopic composition of lithium from naturally occurring minerals is 7.5% (6 squared) Li and 92.5 % (7 squared) Li, which have masses of 6.01512 amu and 7.01600 amu, respectively. A commercial source of lithium, recycled from a military source, was 3.75 % (6 squared) Li (and the rest (7 squared) Li). Calculate the average atomic mass values for each of these two sources. Show your work for partial credit.
An object has a weight of 400 N when it is dry. When it is completely submerged in water is has a weight of 150 N. What is the density of the material is the density of water is 1000 kg/m3?
An electron is to be accelerated from a velocity of 2.00x106m/s to a velocity of 9.00 x 106m/s Through what potential difference must the electron pass to accomplish this?
A tennis ball is given horizontal velocity of 8 m/s when it is hit at a height of 1.8 m above the ground. It is in air for how many seconds
A 24-mH inductor with internal resistance of 40 ohm is connected to a source. Determine the peak current in the circuit and the average power dissipation
The total electric flux from a cubical box 40.0cm on a side is 2280 Nm^(2)/C. What charge is enclosed by the box
The angular velocity of a rotor in a centrifuge increase constantly from 420 rad/s to 1420 rad/s in 5.00 s. a) Determine the angular displacement through which the rotor turns. b) What is the angular acceleration?
A uniform horizontal rod of mass (M) and length (l) rotates with angular velocity (omega) about a vertical axis through its center. Determine the angular momentum of the system about the axis
a simple harmonic oscillator with frequency f 2 hz has initial conditions x0 0.76m and v0 0.31 ms. calculate the
Find the angular momentum of the second hand on a clock. The second hand has a length of 20.0cm and a mass of 8.0g
Estimate the torque necessary to turn the impeller if the fluid is water. What will the impeller rotation speed become if the shaft breaks?
When the film appears to be dark under a red light (=685 nm) for the first time, no further addition of the oil is made. What color, measured in wavelength, will the film appear to be if the glass is directly under the sun light?
The energy flow per unit time per unit area (S) of an electromagnetic wave has an average value of 598 mW/m2. Determine the total energy that traverses the area in a time interval of one minute
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