In which eon of Earth's history did dinosaurs and mammals first appear?

A) Hadean
B) Archean
C) Phanerozoic
D) Proterozoic


C

Physics & Space Science

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When starting from rest at the bottom of a straight road with constant upward slope, Joan bicycles to the top 50.0 s ahead of Sally, whose travel time is 5.00 minutes. What is the ratio of Joan's acceleration to Sally's acceleration?

a. 0.694 b. 0.833 c. 1.20 d. 1.44 e. 6.00

Physics & Space Science

A boy on a bicycle approaches a brick wall as he sounds his horn at a frequency 400 Hz. The sound he hears reflected back from the wall is at a frequency 408 Hz

At what is the speed is the boy riding his bicycle toward the wall? Assume the speed of sound in air is 340 m/s. A) 3.68 m/s B) 333 m/s C) 6.67 m/s D) 6.80 m/s E) 3.37 m/s

Physics & Space Science

At the Earth’s orbital distance, the intensity of the solar radiation is approximately 1400 What is the value for the rms Electric field strength in solar radiation?

A. 726 V/m B. 363 kV/m C. 527 kV/m D. 513 kV/m

Physics & Space Science

Rotational Kinetic Energy: A string is wrapped tightly around a fixed frictionless pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. The string is pulled away from the pulley with a constant force of 5.00 N, causing the pulley to rotate. What is the speed of the string after it has unwound 1.25 m if the string does not slip on the pulley?

A. 2.09 m/s B. 2.36 m/s C. 1.18 m/s D. 3.18 m/s E. 4.95 m/s

Physics & Space Science