If the Sun collapsed to a black hole, Earth's speed in space would
A) increase.
B) decrease.
C) remain the same.
Answer: C
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Why have studies of the geological record not enabled us to determine how life on Earth originated?
A) the first living organisms would have left absolutely no trace of their existence B) life was planted on the Earth by an advanced civilization so there is no evidence in the geological record to find C) the geological record does not extend back to the time that life originated D) the oldest rocks are too deep inside the Earth for us to retrieve
The solution to the solar neutrino problem was
A) the Sun's core is cooling down, producing less neutrinos that expected. B) 2/3 of the neutrinos transform into a new type during the 8-minute trip to Earth. C) the corona is opaque to much of the neutrino radiation. D) the Earth's ozone layer absorbs 2/3 of the neutrinos in transit. E) our solar energy equations were just wrong, and needed much reworking.
A wheel (radius = 0.20 m) starts from rest and rotates with a constant angular acceleration of 2.0 rad/s2 . At the instant when the angular velocity is equal to 1.2 rad/s, what is the magnitude of the total linear acceleration of a point on the rim of the wheel?
a. 0.40 m/s2 b. 0.29 m/s2 c. 0.69 m/s2 d. 0.49 m/s2 e. 0.35 m/s2
A transformer with 600 turns on the primary coil is used to decrease the voltage from 3000 V to 120 V for home use. How many turns should be in the secondary coil?
a. 600 turns b. 15000 turns c. 24 turns d. 3720 turns