The crust of Mars is much thinner than the crust of Earth
a. True
b. False
Indicate whether the statement is true or false
False
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When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal speed. Once he has reached terminal speed
A) his acceleration is equal to g. B) the force of air drag on him is equal to zero. C) the force of air drag on him is equal to g. D) his speed is equal to g. E) the force of air drag on him is equal to his weight.
A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
a. 30 J b. 62 J c. 20 J d. 44 J e. 24 J
Addition by 1. Components: The figure shows three vectors, src="https://sciemce.com/media/4/ppg__cp1pbb0313192044__f15g1q35g6.jpg" style="vertical-align: -5.0px;" />.
, 
, and 
, along with their magnitudes. Determine the magnitude and direction of the vector given by 
- 
- 
What will be an ideal response?
A hydrogen atom is excited to the n = 10 stated. It then decays to the n = 4 state by emitting a photon which is detected in a photographic plate
What is the frequency of the detected photon? The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 3.46 × 1014 Hz B) 0.865 × 1014 Hz C) 1.27 × 1014 Hz D) 4.05 × 1014 Hz E) 1.73 × 1014 Hz