The statement "No detectable change in the total mass occurs during a chemical reaction" is known as the law of ______________
Fill in the blank(s) with correct word
conservation of mass
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An object of mass 4.0 kg starts at rest from the top of a rough inclined plane of height 10 m as shown in the figure
If the speed of the object at the bottom of the inclined plane is 10 m/s, how much work does friction do on this object as it slides down the incline? What will be an ideal response?
The constellation shaped like a W is
A) Cassiopeia. B) Pegasus. C) Canis Major. D) Taurus. E) Andromeda.
According to our theory of solar system formation, why do all the planets orbit the Sun in the same direction and in nearly the same plane?
A) The laws of conservation of energy and conservation of angular momentum ensure that any rotating, collapsing cloud will end up as a spinning disk. B) The original solar nebula happened to be disk-shaped by chance. C) Any planets that once orbited in the opposite direction or a different plane were ejected from the solar system. D) Luck explains it, as we would expect that most other solar systems would not have all their planets orbiting in such a pattern. E) The Sun formed first, and as it grew in size it spread into a disk, rather like the way a ball of dough can be flattened into a pizza by spinning it.
If barium has a work function of 2.6 eV, what is its cutoff wavelength when used as a phototube target? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J and 1 nm = 10?9 m)
a. 765 nm b. 478 nm c. 777 nm d. 380 nm