A small dust particle of mass 7.90 × 10-6 g is being observed under a magnifying lens
Its position is determined to within 0.0050 mm. (1 y = 3.156 × 107, h = 1.055 × 10-34 J ? s)
(a) Find the minimum uncertainty in its velocity implied by the uncertainty in its position.
(b) Assuming the dust particle is moving at the speed you just found, how many years would it take for the particle to move 1.0 mm?
(a) 2.7 × 10-21 m/s (b) 1.2 × 1010 y
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Within a standing wave on a string,
1.all points along the string that oscillate do so within a range of different frequencies and amplitudes. 2.all points along the string that oscillate do so at the same frequency but within a range of different amplitudes. 3.all points along the string that oscillate do so within a range of different frequencies but at the same amplitude. 4.all points along the string that oscillate do so at the same frequency and amplitude.
Even when the temperature of a pan of water is below the boiling point, some water still evaporates. This is because
a. of convection b. the kinetic energies of individual water molecules vary above and below the average value c. the humidity always increases d. none of the above
Kieran takes off from rest down a 50 m high, 10° slope on his jet-powered skis. The skis have a thrust of 280 N parallel to the surface of the slope
The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible). Kieran's speed at the bottom is 40 m/s. What is the coefficient of kinetic friction of his skis on snow? A) 0.47 B) 0.58 C) 0.23 D) 0.29
An uncharged, series RC circuit is connected across a battery. For which situation will the time for the capacitor to reach 90% of its final charge remain unchanged? a. The RC time constant is doubled
b. The battery voltage is doubled. c. A second resistor is added in series with the original resistor. d. All of these situations result in the time for the capacitor to reach 90% of its final charge to change.