In Figure 4.2, the applied force F equals 150 N. The force in link B is closest to:
A) 54 N
B) 56 N
C) 58 N
D) 60 N
E) 62 N
E
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The Sun has a surface temperature of approximately 5800 K. At what wavelength does the maximum energy radiated by the Sun occur?
a. 5800 nm b. 300 nm c. 174 nm d. 500 nm e. 3000 nm
Coulomb's Law: An electron and a proton are released simultaneously from rest and start moving toward each other due to their electrostatic attraction, with no other forces present. Which of the following statements are true just before they are about to collide? (There could be more than one correct choice.)
A. They are closer to the to the initial position of the electron that to the initial position of the proton. B. They are closer to the to the initial position of the proton that to the initial position of the electron. C. They are at the midpoint of their initial separation. D. They both have the same speed. E. The electrostatic force on the proton is greater than the electrostatic force on the electron.
Venus and Earth started out with roughly the same amount of water. While Earth still has water in abundance, all of Venus' was lost. Where did it go?
A) It chemically combined with CO2 to form H2CO3.
B) Ultraviolet rays split the hydrogen from the oxygen components, and the hydrogen escaped into space.
C) It all evaporated into space due to the intense daytime heat of 470°C.
D) Scientists are still trying to determine this.
A transformer is used to step up the voltage to a power line. If the stepped-up voltage is 10 times the original value, by how much will the power loss in the line decrease?
a. more than 95% b. between 10% and 20% c. between 20% and 95% d. There will be no change since the power into a transformer equals the power out.