To estimate the central temperature of the Sun, scientists ________
A) use hot gas to create a small Sun in a laboratory
B) send probes to measure the temperature
C) monitor changes in Earth's atmosphere
D) use computer models to predict interior conditions
D
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2.9×10^7 is the same as
a. 2.9 thousand. b. 29 thousand. c. 290 thousand. d. 2.9 million. e. 29 million.
A cylindrical bar that us well insulated around its sides connects hot and cold reservoirs and conducts heat at a rate of 10.0 J/s under steady state conditions
If all of its linear dimensions (diameter and length) are reduced by half, the rate at which it will now conduct heat between the same reservoirs is closest to A) 80.0 J/s. B) 20.0 J/s. C) 5.00 J/s. D) 2.50 J/s. E) 1.25 J/s.
A spring-driven dart gun propels a 10. g dart. It is cocked by exerting a force of 20. N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?
What will be an ideal response?
Which of the following characteristics are held in common by both gravitational and electrostatic forces when dealing with either point masses or charges?
a. inverse square distance law applies b. forces are conservative c. potential energy is a function of distance of separation d. all of the above choices are valid