The resultant of a 40-N force at right angles to a 30-N force is
A) 30 N.
B) 40 N.
C) 50 N.
D) greater than 50 N.
Answer: C
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Give a physical explanation of each of these 3 groups and explain when you expect Bo and Ja to exert a significant influence and when their respective influence is negligible.
GIVEN
? Three of the dimensionless groups upon which the condensation Nusselt number depends
FIND
(a) Physical explanation for the three groups
(b) When Ja and Bo are important
A scientist tries to determine why a particular car is getting a much lower gas mileage than claimed by the manufacturer by systematically designing experiments to test possible causes for the problem. This is an example of
A) discovery science B) nonscience C) hypothesis-driven science D) pseudoscience
An 800-N billboard worker stands on a 4.0-m scaffold weighing 500 N and supported by vertical ropes at each end. How far would the worker stand from one of the supporting ropes to produce a tension of 770 N in that rope?
a. 1.4 m c. 2.5 m b. 2.0 m d. 2.7 m
How much energy is dissipated as heat during a two-minute time interval by a 1.5-kW resistor which has a constant 20-V potential difference across its leads?
a. 58 J b. 46 J c. 32 J d. 72 J e. 16 J