A wire has a strain of 0.10%. If the wire has an un-stretched length of 5.00 m, then the change in length of the wire is
A. 5.0 mm.
B. 7.0 mm.
C. 9.0 mm.
D. 10 mm.
E. 15 mm.
A. 5.0 mm.
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Car A leaves point O at t = 0 and travels a quarter circle counterclockwise at 30.0 m/s to point P. Car B will leave point O and travel to point P at the same speed but in a straight line. The radius of the circle is 100 m. At what time should car B leave point O in order to arrive at point P at the same time as car A?
a. At t = 0. b. At t = 0.52 s. c. At t = 4.71 s. d. At t = 4.98 s. e. At t = 5.24 s.
Discuss whether any work is being done by each of the following agents and, if so, whether the work is positive or negative
(i) a chicken scratching on the ground (ii) a person studying physics (iii) a crane lifting a bucket of concrete (iv) the gravitational force on the bucket in (iii) (v) the leg muscles of a person in the act of sitting down
1.All of them do work. Positive work is done in cases (i), (ii), and (iii) and negative work is done in cases (iv) and (v). 2.No work is done in case (ii). Positive work is done in cases (i) and (iii) and negative work is done in cases (iv) and (v). 3.No work is done in cases (i) and (ii). Positive work is done in case (iii) and negative work is done in cases (iv) and (v). 4.No work is done in cases (i) and (ii). Positive work is done in cases (iii) and (v) and negative work is done in case (iv).Which of the following is a difference between Saturn and Jupiter?
A) Unlike Jupiter, Saturn is rich in hydrogen and helium. B) Saturn has more liquid metallic hydrogen than Jupiter. C) Belts and zones on Saturn are less visible than on Jupiter. D) Unlike Jupiter, Saturn radiates more energy than it receives.
The parallactic angle is the total shift observed over a six-month interval
Indicate whether the statement is true or false