Because of the equivalence of mass and energy, an electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass
Indicate whether the statement is true or false
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Calculate (0.82 + 0.042) × (4.49 × 10^3), keeping only significant figures
a. 3870.8 c. 3879 b. 3870 d. 3900
A 1.5-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If this system is displaced 20 cm horizontally from the equilibrium position and released from rest, the block first reaches the equilibrium position with a speed of 2.0 m/s. What is the coefficient of kinetic friction between the block and the horizontal
surface on which it slides? a. 0.34 b. 0.24 c. 0.13 d. 0.44 e. 0.17
Once oxygen started to be manufactured by cyanobacteria, why did it take so long to build up to significant levels?
A) initially most of the oxygen escaped into space B) oxidation of surface rock and ocean minerals occurred C) initially most of the oxygen produced dissolved in the oceans D) initially most of the oxygen was converted into water by reaction with hydrogen
Blue light travels more slowly through glass than red light does
a. True b. False Indicate whether the statement is true or false