A carbon resistor has a resistance of 18 ? at a temperature of 20°C. What is its resistance at a temperature of 120°C? The temperature coefficient of resistivity for carbon is -5.0 × 10-4/C°
A) 16 ? B) 18 ? C) 17 ? D) 15 ?
C
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An iceberg is floating in the ocean with 10% of its volume extending above the ocean's surface. What can you say about the iceberg?
A. As it melts, a smaller fraction of its volume will extend above the surface B. Its density is close to but smaller than the density of water C. It displaces only 90% of its weight in water D. Its weight is less than the water it displaces
An object of mass 8.0 kg is attached to an ideal massless spring and allowed to hang in the Earth's gravitational field. The spring stretches 3.6 cm before it reaches its equilibrium position
If this system is allowed to oscillate, what will be its frequency? A) 0.0045 Hz B) 0.67 Hz C) 2.6 Hz D) 2.1 Hz
Olivine is the most common mineral in Earth's mantle.
Answer the following statement true (T) or false (F)
Collisions between which pairs of objects is likely to be most nearly elastic?
A. A steel ball and a baseball B. Two steel balls C. A steel ball and a cotton ball D. Two baseballs