Why can we never create matter?
A) because matter is always conserved
B) because energy is always conserved
C) because it is impossible to create the fundamental particles such as electrons and protons
D) because we aren't capable of creating another universal "big bang"
E) Actually, we do create matter frequently in the lab.
E
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An asteroid in orbit about the Sun has a linear speed of 4 km/s when at a distance of closest approach d from the sun. What is its linear speed when it is at its greatest distance from the sun, a distance 4d?
a. 1 km/s c. 8 km/s b. 2 km/s d. 16 km/s
Earth has a natural greenhouse effect, principally due to water vapor.
Indicate whether the statement is true or false
Refer to Figure 6-13 Block A has a mass of 5.00 kg, block B has a mass of 3.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the tension in the string connecting blocks B and C?
A. 20.6 N B. 13.7 N C. 38.3 N D. 25.5 N E. 34.3 N
How do jets produced by radio galaxies differ from those of protostars?
What will be an ideal response?