Relative Velocity: A 960-m wide river flows at 16 m/s as shown in the figure. Alice and John have a race in identical boats which each travel 20 m/s in still water. Alice leaves point A and steers so that she goes straight to point B directly across and then back to A. John leaves point A and steers up to point C (960 m upstream) and then returns to A.(a) Which person arrives back at point A first?(b) How much sooner than the loser does the winner arrive back at point A?
What will be an ideal response?
(a) Alice (b) Alice arrives 110 s before John
Physics & Space Science
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The price of gasoline goes up 6% on Monday night and then goes down 7% today. What is the net percentage change in the price of gasoline from Monday?
A. 1.0% B. 2.0% C. 1.4% D. -1.0%
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Which terrestrial world has the most atmosphere?
A) Venus B) Earth C) Mars D) Mercury.
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Impulse: A forklift pushes a 100-kg crate, starting from rest, with a horizontal force of magnitude F. The graph in the figure shows the x component of this force as a function of time. What is the instantaneous velocity of the crate at time t = 10 s?
A. 25 cm/s B. 0.00 cm/s C. 75 cm/s D. -25 cm/s E. -75 cm/s
Physics & Space Science
The Sun fuses _____ hydrogen nuclei to make one helium nucleus
A) two B) three C) four D) five
Physics & Space Science