A body of related and rigorously tested theories can be pieced together into a much larger description of nature called a hypothesis.
Indicate whether the statement is true or false.
Answer: False.
Explanation: A body of related and rigorously tested hypothesis can be pieced together into a much larger description of nature called a theory.
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If the kinetic energy of an object increases, then
A. the speed must increase as well. B. the total energy must increase. C. there can only be one force on the object. D. the potential energy must decrease.
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
If a single force acts on an object, the object accelerates
1.True 2.False
An atom gains one extra electron. How does the resulting ion behave when it is near a positively charged transparency? How does the ion behave when it is near a negatively charged tissue?
A) The ion is attracted to the positively charged transparency, but repelled from the negatively charged tissue. B) The ion is repelled from both the transparency and from the tissue. C) The ion is repelled from the positively charged transparency, but attracted to the negatively charged tissue. D) The ion is attracted to both the transparency and to the tissue.