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Questions in physics

[Homework Help] QUESTION 17 In order for the aluminum bar to have its rate of conduction increased, which of the following changes should be made? A. Increase its length B. Increase its thickness C. Decrease its thermal conductivity D. Decrease the temperature gradient QUESTION 18 In an experiment, Tom records the resistance value of a 20cm strip of metal that is kept at four (4) different temperatures. His results are recorded below. Temperature of metal strip Resistance of metal strip 0°C 0.100 25°C 0.400 50°C 0.700 75°C 1.00 What is the average change in resistance of the metal for each 10°C rise in temperature? A. 0.0120 B. 0.0130 C. 0.0140 D. 0.0160 QUESTION 19 John has four (4) shirts of different colors. On a hot sunny day, he tries to decide which shirt he will wear. Each of the colors of the shirts is given below. Which colored shirt will reflect most of the heat radiation? A. Black B. White C. Yellow D. Red QUESTION 20 In which part of a refrigerator will the refrigerant change from a low temperature, low pressure gas to a high temperature, high pressure gas? A. Evaporator B. Compressor C. Expansion valve D. Condenser

[Homework Help] What is the best definition of physics? A. The study of how matter is used in living things B. The study of how energy and matter interact in the physical world C. The study of different kinds of matter and how they react with each other D. The study of the laws of nature

[Homework Help] Which element of a rectifier only allows current to flow in one direction? a. Shunt b. Stack c. Circuit breaker d. Tap

[Homework Help] A ball has a mass of 140 g. What is the force needed to accelerate the ball at [tex]$25 m / s ^2$[/tex]? (Formula: [tex]$F= ma$[/tex])

[Homework Help] Record your data. | | Record your data. | S (cm) | SS ($cm^2$) | $\frac{1}{S}(cm^{-1})$ | |---|-------------------|--------|-------------|-------------------------| | 7 | | | | |

[Homework Help] What is the electric force acting between two charges of 0.0072 C and -0.0060 C that are 0.0040 m apart? Use [tex]$F_o=\frac{k q_1 q_2}{r^2}$[/tex] and [tex]$k =9.00 \times 10^9 N \cdot m ^2 / C ^2$[/tex]. A. [tex]$9.7 \times 10^7 N$[/tex] B. [tex]$-2.4 \times 10^{10} N$[/tex] C. [tex]$-9.7 \times 10^7 N$[/tex] D. [tex]$2.4 \times 10^{10} N$[/tex]

[Homework Help] Find the velocity, [tex]v[/tex], (in m/s) of the object when [tex]t=4[/tex]. [tex] \lim _{t \rightarrow 0} \frac{s(0)-s(t)}{s-t} [/tex] [tex]v=[/tex]

[Homework Help] The following are scalar quantities except: (a) Temperature (b) Time

[Homework Help] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Homework Help] Which term is the product of force and distance? A. power B. work C. net force D. acceleration