A 1200-kg car is pulling a 500-kg trailer along level ground. Friction is negligible. The car accelerates with an acceleration of 1.3 m/s2. What is the force exerted by the car on the trailer?
A) 550 N
B) 600 N
C) 650 N
D) 700 N
E) 750 N
C
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Transverse waves travel with a speed of 105 m/s along a taut copper wire that has a diameter of 2.28 mm. What is the tension in the wire? (The density of copper is 8.93 g/cm3.)
a. 1 610 N b. 803 N c. 402 N d. 201 N e. 128 N
What is the purpose of the Reynolds-Colburn analogy?
What will be an ideal response?
Wedell seals make holes in sea ice so they an swim down to forage on the ocean floor below. Measurements for one seal showed that it dived straight down from such an opening reaching a depth of .30 km in a time of 5.0 minutes. What was the speed of the diving seal?
A. .60 M/S B. 1.0 M/S C. 1.6 M/S D. 6.0 M/S E. 10 M/S
An auditorium has a volume of 6 × 10^3 m3 . How many molecules of air are needed to fill the auditorium at one atmosphere and 0°C?
a. 1.6 × 10^29 b. 1.6 × 10^27 c. 1.6 × 10^25 d. 1.6 × 10^23 e. 1.6 × 10^20