Physics, 27.02.2020 03:52 Carlyalexis641
A survey of 500 college students found that the percentage of students who went without using digital technology for up to 1 hr was 67. The survey also determined that the percentage of students who went without using digital technology for up to 30 min exceeded the percentage of students who went without using digital technology for over 1 hr by 17. Let x, y, and z represent the percentage of the students in the survey who went without using digital technology a for up to 30 min, b for more than 30 min but not more than 60 min, and c for more than 60 min, respectively. Find the values of x, y, and z
Answers: 1
Physics, 22.06.2019 12:00
The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?
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Physics, 22.06.2019 15:40
If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.
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Physics, 22.06.2019 22:00
1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light
Answers: 3
A survey of 500 college students found that the percentage of students who went without using digita...
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