A 1200-kg car is being raised at a constant speed if 25 cm/s by a crane, using a 20-m long steel cable that is 1.5 cm in diameter. Young's modulus for steel is 2.0 × 1011 Pa. What is the change in length of the cable caused by the car?
A) 6.7 mm
B) 6.7 cm
C) 3.3 mm
D) 3.3 cm
E) 3.3 m
A
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What size capacitor should be placed in series with a 30-? resistor and a 40-mH inductive coil if the resonant frequency of the circuit is to be 1.0 kHz?
A) 3.3 µF B) 0.63 µF C) 6.0 µF D) 4.5 µF E) 2.0 µF
A baseball is thrown straight upward. At the very top of its trajectory its instantaneous velocity is zero and its acceleration is
1) zero. 2) 10 m/s2. 3) between zero and 10 m/s2. 4) none of these. We can better understand this by noting that when it is at its highest point 5) there momentarily is no motion. 6) its rate of change of motion is still 10 m/s2. 7) although its velocity is not changing, its direction is.
What observational evidence supports the fact that our universe is static and unchanging?
a. detection of the cosmic microwave background (CMB) b. dark sky at night c. redshift of galaxies d. evolution of galaxies with distance e. None of the other choices are correct.
An electron is known to be confined to a region of width 0.10 nm. What is an approximate expression for the least kinetic energy it could have, expressed in eV?
What will be an ideal response?