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Question: Solid metallic aluminum has an atomic mass of 26.98 u and a density of 2.73 g cm-3. If each Al atom contributes 3 electrons to current flow, what is the number density of these "conduction" electrons? In an Al wire of diameter 1mm, what is the average speed of the electrons when the current is 1A?
A cheerleader does a handstand on other cheerleader’s hands. If the lower cheerleader weighs 180 lbs and the vertical ground reaction force is 1300 N, what should the top cheerleader's mass be to have equilibrium?
Sodium light of wavelength 589nm falls on a diffraction grating and its first-order peak on a screen 60.0cm away falls 3.32cm from the central peak. How many lines per cm does the grating have
Keeping a constant speed of 0.6 m/s, a marble of mass 18 g rolls back & forth across a shoebox that is 14 cm high & 2 mm thick. Estimate the probability of its escaping through the wall of the box by quantum tunnelling.
At 20°C, a brass cube has an edge length of 35 cm. What is the increase in the cube's surface area when it is heated from 20°C to 81°C
a meteoroid is speeding through the atmosphere traveling east at 23.8 kms while descending at 19.9 kms. what is its
A tennis ball with a mass of 175.0 grams moves with a speed of 15.75 m/s towards all. the ball rebounds with a speed of 12.99 m/s after being in contact with the wall 71.99 ms, find the force that acted on the ball.
Write up the results in APA style, including testing for the assumptions. Determine and interpret a measure of effect size.
A steel rod with a length of l = 1.55 m and a cross section of A = 4.84 cm2 is held fixed at the end points of the rod. What is the size of the force developing inside the steel rod
question1there are two identical vessels a and b of volume v each one empty and other containing the block of wood of
A modem is designed to transmit at 100 kbps over a channel with 15 dB signal to nose ratio. Find the maximum symbols on the constellation of this modem.
1- define velocity and acceleration in terms of position and time. differentiate between the instantaneous quantities
A laser is mounted on a table 1.00m above the ground, pointed at a vertical mirror a horizontal distance 3.48maway. At what height does the reflected beam strike the wall
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