In free fall, the ______________ is constant
Fill in the blank(s) with correct word
acceleration
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A person running in place on an exercise machine for 10 min uses up 17 kcal (food calories). Another person exercises by repeatedly lifting two 2.5-kg weights a distance of 50 cm
How many repetitions of this exercise are equivalent to 10 minutes of running in place? Assume that the person uses negligible energy in letting down the weights after each lift. (1 cal = 4.186 J) A) 730 B) 2900 C) 1450 D) 2200 E) 1500
The first extrasolar planets discovered are small and have long orbital periods
a. True b. False Indicate whether the statement is true or false
Radioactive Decay: The decay constant of a radioactive nuclide is 4.6 × 10-3 s-1. What is the half-life of this isotope, in minutes?
A. 2.5 min B. 3.6 min C. 3.1 min D. 1.4 min E. 2.0 min
Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s
Their dog, Spot, starts from Arthur's side at the same time and runs back and forth between them. By the time Arthur and Betty meet, what is Spot's displacement?