String theories, like GUTs, explain how gravity was combined with the other fundamental forces in the very early universe
Indicate whether the statement is true or false
FALSE
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What is meant by compressibility?
What will be an ideal response?
The resistance of a platinum wire is to be calibrated for low-temperature work. A platinum wire with resistance 1.5 ? at 30°C is immersed in liquid nitrogen at 93 K (?180°C). If the temperature response of the platinum wire is linear, what is the expected resistance of the platinum wire at ?180°C? [?platinum = 3.92 × 10^?3 (°C)?1]
a. 0.265 ? b. 2.38 ? c. 2.73 ? d. 8.48 ? e. 0.618 ?
The intensity of a 70-dB whistle is doubled. What is the new decibel level?
Cells at the top of a tree have a higher concentration of sugars than cells at the bottom. How might this fact assist a tree in moving water upward from its roots?
A) Cells with high concentrations of sugar are more dense. As these cells migrate downwards, cells containing fresh water are able to migrate upwards. B) Water is pushed upwards by osmostic pressure. C) It doesn't. In fact, water makes it to the top of a tree because that is where the water molecules are being evaporated. D) Fresh water is drawn upwards to the sugar containing cells by way of dipole-dipole molecular interactions.