A block and a beaker of water are placed side-by-side on a scale (case A). The block is then placed into the beaker of water, where it sinks (case B). How do the two scale readings compare?
1.Scale A reads more than scale B.
2.Scale A reads the same as scale B.
3.Scale A reads less than scale B.
4.Not enough information.
2
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The scientific method is a ___________________ by which scientists form hypotheses and test them agains evidence gathered by observation or experiment
Fill in the blank(s) with correct word
How long will it take a charged 80-?F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45-? resistor?
a. 0.92 ms b. 0.64 ms c. 0.40 ms d. 0.19 ms e. 0.80 ms
An electron is confined in a harmonic oscillator potential well. A photon is emitted when the electron undergoes a 3?1 quantum jump
What is the wavelength of the emission if the net force on the electron behaves as though it has a spring constant of 9.6 N/m? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 290 nm B) 150 nm C) 190 nm D) 580 nm
When a mass of 0.350 kg is attached to a vertical spring and lowered slowly, the spring stretches 12.0 cm. The mass is now displaced from its equilibrium position and undergoes simple harmonic oscillations. What is the period of the oscillations?
A) 0.695 s B) 0.483 s C) 0.286 s D) 0.0769 s E) 1.44 s