A red car has a head-on collision with an approaching blue car with the same magnitude of momentum. A green car driving with the same momentum as the other cars collides with an enormously massive wall
Which of the three cars will experience the greatest impulse?
A) red car
B) blue car
C) green car
D) all the same
Answer: D
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Water is an example of a(n):
a. atom b. ion c. compound d. mixture e. element
A +2-?C charge is at rest in a magnetic field of 2 T pointing along the +x-axis. What is the force acting on this charge in the magnetic field?
A) -4 ?N B) +4 ?N C) -2 ?N D) +2 ?N E) 0 N
At room temperature, a typical person loses energy to the surroundings at the rate of 62 W
If this energy loss has to be made up by an equivalent food intake, how many kilocalories (food calories) does this person need to consume every day just to make up this heat loss? (1 cal = 4.186 J) A) 1300 kcal B) 1100 kcal C) 1600 kcal D) 1000 kcal E) 1500 kcal
Consider a submarine at a depth of 67. meters in sea water (density 1.03 grams/cc) and the interior of the sub is at 1.0 atmosphere
(a) What is the outside pressure at that depth? (b) Find the total force that must be withstood by a square hatch (0.90 m square) which leads to the sub interior.