The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The velocity acquired after starting from rest is 8 m/s
Indicate whether the statement is true or false
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Diffraction Gratings: The distance between the ruled lines on a diffraction grating is 1900 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band. What is the angular width of the gap between the first order spectrum and the second order spectrum?
A. 3.3° B. 4.3° C. 5.3° D. 6.3° E. 2.3°
Fossils typically contain little or no organic matter because
A) the organic matter has been destroyed when the rock containing the fossil was melted deep within the Earth's crust B) over time inorganic minerals have gradually replaced the organic matter C) the organic matter has radioactively decayed into inorganic matter D) ancient organisms contained little organic matter
Potassium-40 decays into daughter isotopes with a half-life of _____
A) 1.25 billion years B) 1.5 billion years C) 1.75 billion years D) 2 billion years
Which unit represents the most energy?
A) calorie B) Calorie C) joule D) all the same