The figure above shows the geological time scale of Earth. The time since dinosaurs went extinct (with the K-T event) represents approximately ________ of the Earth's history.
A) 0.15%
B) 1.5%
C) 15%
D) 50%
B) 1.5%
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If a body's acceleration is doubled then the amount of force acting on the body had to _______
a. double b. halve c. stay the same d. None of the other choices are correct.
A 4.00 kg object is moving at 5.00 m/s NORTH. It strikes a 6.00 kg object that is moving EAST at 2.00 m/s. The objects have a completely inelastic (stick together) collision. The velocity of the 6.00 kg object after the collision is
A. 2.33 m/s at an angle of 35.0 degrees NORTH of EAST. B. 2.33 m/s at an angle of 59.0 degrees NORTH of EAST. C. 2.00 m/s at an angle of 59.0 degrees NORTH of EAST. D. 2.00 m/s at an angle of 45.0 degrees NORTH of EAST. E. 2.33 m/s at an angle of 45.0 degrees NORTH of EAST.
What is the energy of a photon whose frequency is 2.9 × 10^20 Hz? (h = 6.63 × 10^?34 J?s and 1 eV = 1.60 × 10^?19 J)
a. 0.2 MeV b. 1.2 MeV c. 1.9 MeV d. 3.1 MeV e. 0.8 MeV
What precision should you expect for a quantity that you determine by estimation in which variables used in the calculation are rounded to the nearest power of ten?
A) Two significant figures will always be correct. B) the correct order of magnitude C) Anywhere from two to three significant figures will always be correct. D) One significant figure will always be correct. E) Three significant figures will always be correct.