What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
A) gravitational force and outward pressure B) gravitational force and surface tension
C) the strong force and the electromagnetic force D) the strong force and the weak force
A
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Austenitic stainless steel is _________corrosion resistant than ferritic stainless steel.
Fill in the blank(s) with the appropriate word(s).
Transformers: An ideal step-down transformer is needed to reduce a primary voltage of 120 V to 6.0 V. What must be the ratio of the number of turns in the secondary to the number of turns in the primary?
Fill in the blank(s) with the appropriate word(s).
Sound waves of a certain frequency in air having a wavelength of 1.9 m will have what wavelength in water? Take the speed of sound in air to be 340 m/s and in water to be 1490 m/s
a. 0.57 m c. 8.3 m b. 1.9 m d. 11 m
A car is traveling north at 1.77m/s. After 12 s its velocity is in the same direction. Find the magnitude and direction of the car's average acceleration
A) 0.30 m/s2, south B) 2.7 m/s2, south C) 0.30 m/s2, north D) 2.7 m/s2, north