Power: A 100%-efficient engine is being used to raise a 89-kg crate vertically upward at a steady rate. If the power output of the engine is 1620 W, how long does it take the engine to lift the crate a vertical distance of 18.7 m? Friction in the system is negligible.
Fill in the blank(s) with the appropriate word(s).
10 s
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Spectral Series: What is the shortest wavelength of the Lyman series?
A. 91.16 nm B. 45.60 nm C. 121.5 nm D. 204.1 nm E. 365 nm
An unfueled 1 000-kg experimental rocket sled on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20-s "burn.". If the rocket, initially at rest, moves at 160 m/s after the burn, what impulse is experienced by the rocket sled?
a. 1.1 × 10^5 kg·m/s b. 1.6 × 10^5 kg·m/s c. 1.5 × 10^5 kg·m/s d. 1.9 × 10^5 kg·m/s
The person who first explained the blackbody spectrum was
a. Max Planck b. Albert Einstein c. Neils Bohr d. Erwin Schroedinger e. Werner Heisenberg
In a paramagnetic material the magnetic susceptibility is
(a) Linearly dependent upon temperature. (b) Independent of temperature. (c) A nonlinear function of temperature. (d) Inversely dependent upon temperature.