What particle is emitted when 20Na decays to 20Ne? (atomic numbers of Na and Ne are, respectively, 11 and 10)
a. alpha
b. beta (electron)
c. beta (positron)
d. gamma quantum
c
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Graphical Analysis: The graph in the figure shows the position of a particle as it travels along the x-axis. What is the magnitude of the average speed of the particle between t = 1.0 s and t = 4.0 s?
A. 1.0 m/s B. 1.3 m/s C. 0.67 m/s D. 0.50 m/s E. 0.25 m/s
A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 10^5 J/kg)
Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it really is. Assume a cylindrical bottle with an inner radius of 1.0 cm and an outer radius of 2.0 cm. What percentage of the apparent volume is the real volume?
a. 95% b. 60% c. 80% d. 64% e. 75%
Ethyl alcohol bubbles form at 78.50C, 101 kPa. Assuming that the surface tension is 75 mN/m and the density of vapor ethyl alcohol is 0.8 kg/m^3 with a vapor pressure of 102 kPa, estimate the buoyant force acting on the bubbles.
What will be an ideal response?