A 475-gram ball is traveling horizontally at 12.0 m/s to the left when it is suddenly struck horizontally by a bat, causing it to reverse direction and initially travel at 8.50 m/s to the right
If the bat produced an average force of 1275 N on the ball, for how long (in milliseconds) was it in contact with the ball?
7.64 ms
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Radiation: What is the net power radiated by a little animal with a surface area of 0.075 m2 if his emissivity is 0.75, his skin temperature is 315 K, and he is in a room with a temperature of 290 K? (? = 5.67 × 10-8 W/m2 ? K4)
A. 8.8 W B. 6.0 W C. 8.0 W D. 15 W E. 18 W
If it were not for the greenhouse effect on Earth,
a. there would be no liquid water on Earth. b. life as we know it would not have developed on Earth. c. it would be a much colder planet. d. there would be no oxygen in Earth's atmosphere. e. All of the above are results of the greenhouse effect.
The person who developed the concept of a wave function was
a. Max Planck. b. Albert Einstein. c. Neils Bohr. d. Erwin Schrödinger. e. Werner Heisenberg.
One common way to polarize a beam of light is to
A. slow it down using a piece of glass. B. filter out the longest wavelengths of the spectrum. C. use a sheet of Polaroid material. D. filter out the shortest wavelengths of the spectrum.