Water molecules consist of one oxygen atom and two hydrogen atoms. In these covalent bonds, the electrons are pulled towards the oxygen side of the covalent bond, making one side of the molecule slightly negative and the other side of the molecule slightly positive. What is this characteristic of water called?
a. polarity
b. ionic
c. hydrophilic
d. hydrophobic
e. cohesion
a
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It is a well-known physiological phenomenon that some materials feel cooler to the touch than others. This is important in the design of instruments for the use of operators, especially in a space station. Experiments conducted at NASA have shown that different materials, e.g., aluminum and plastic, though in identical size and temperature feel very different to the touch. Consider two plates, one made of aluminum and the other of plastic, each at an initial temperature of 25°C. Determine which of the two will feel hotter to the touch of your finger if it is initially at 32°C. Assume that your finger has a density of 1000 kg/m3, specific heat of 4180 J/(kg K), and thermal conductivity of 0.625 W/(m K). Also, properties of aluminum are given in, and plastic is considered to have a
density of 1990 kg/m3, specific heat of 1470 J/(kg K), and thermal conductivity of 0.21 W/(m K).
GIVEN
FIND
which of the aluminum or plastic feel hotter to touch to your finger.
ASSUMPTIONS
constant thermal properties
Negligible contact resistance
The finger and plate behave as semi infinite solid.
SKETCH
Force on a Moving Charge: A proton moving at 5.0 × 104 m/s horizontally enters a region where a magnetic field of 0.12 T is present, directed vertically downward. What magnitude force acts on the proton due to this field? (e = 1.60 × 10-19 C)
Fill in the blank(s) with the appropriate word(s).
Mercury has a radius of about 0.38 Earth radii and a mass of only 0.055 Earth masses. Estimate the acceleration due to gravity on Mercury.
A. 1.45 m/s2 B. 3.81 m/s2 C. 26.3 m/s2 D. 69.1 m/s2
A major surprise from space exploration is that ________ exists at the poles of both Mercury and our Moon
Fill in the blank(s) with correct word