A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale. Assume there is no frictional force between the bottom of the scale and the hill. The static friction force the scale exerts on the person is
a. 0 N.
b. 201 N.
c. 211 N.
d. 553 N.
e. 580 N.
A
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A 4 ft radius spherical container holds helium gas at 20 psia and 95ºF. Estimate the amount of helium lost through diffusion in 24 hours if the sphere is made of silicon dioxide, SiO2 (glass) and if it is assumed that at a point 1/8 inches into the container wall from the inside the concentration of helium is zero.
What will be an ideal response?
How many neutrons are in a 15C nucleus?
A. 7 B. 8 C. 6 D. 9
An electron and an alpha particle (a helium-4 nucleus) each have the same non-relativistic speed. Which has the greatest kinetic energy, and which has the shortest de Broglie wavelength?
a. the alpha particle, the alpha particle b. the alpha particle, the electron c. the electron, the alpha particle d. the electron, the electron
The combining of two nuclei to form a larger nucleus with the release of energy is nuclear fusion
Indicate whether the statement is true or false