A shot-putter moves his arm and the 7.0-kg shot through a distance of 1.0 m, giving the shot a velocity of 15 m/s from rest. Find the average force exerted on the shot during this time
a. 197 N
c. 600 N
b. 394 N
d. 790 N
D
Physics & Space Science
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Consider a radioactive substance with a half-life of 10 years. If you start with 1 kilogram of this substance, after 20 years, ________ of the radioactive substance will remain.
A) 0.25 kilogram B) none C) 0.75 kilogram D) 0.5 kilogram
Physics & Space Science
What is the mass number of alpha particles?
A) 1 B) 2 C) 3 D) 4 E) 6
Physics & Space Science
What is the power output of a hot air furnace that produces heat at the rate of 160,000. BTU/hr?
A) 22 kW B) 80 kW C) 47 kW D) 7.6 kW E) 1.6 kW
Physics & Space Science
For the same temperature increase in a system, the change in entropy, DS, is largest in a reversible
a. constant volume process. b. constant pressure process. c. adiabatic process. d. process in which no heat is transferred. e. process in which no work is performed.
Physics & Space Science