A boat moves through the water in a river at a speed of 8 m/s relative to the water. The boat makes a trip downstream and then makes a return trip upstream to the original starting place. Which trip takes less time?
a. the downstream trip
b. the upstream trip
c. Both trips take the same amount of time.
d. The answer cannot be figured without knowing the speed of the river flow.
A
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In each of the following situations, point charge q moves in a uniform magnetic field B. The strength of the magnetic field is indicated by the density of field lines. In each situation, the initial speed v of the charge is the same. For which situation(s) will the charge q travel the longest distance in a certain time T?
1.1
2.2
3.3
4.4
5.5
6.1 & 3
7.2 & 4
8.1, 2, 3 & 4
9.1, 2, 3, 4 & 5
10.Cannot be determined
Work: Two men, Joel and Jerry, push against a car that has stalled, trying unsuccessfully to get it moving. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do on the car.
A. Joel does 75% more work than Jerry. B. Joel does 50% more work than Jerry. C. Jerry does 50% more work than Joel. D. Joel does 25% more work than Jerry. E. Neither of them does any work.
There is no reason to believe that there have been any changes in the Sun that could affect climate
What will be an ideal response?
A drag racer starts from rest and accelerates at 8.0 m/s2 for the entire distance of 400 m (1/4 mile). What is the speed of the race car at the end of the run?
a. 32 m/s c. 64 m/s b. 40 m/s d. 80 m/s