A car travels north at 30 m/s for one half hour. It then travels south at 40 m/s for 15 minutes. The total distance the car has traveled and its displacement are:

a. 18 km; 18 km S.
b. 36 km; 36 km S.
c. 36 km; 36 km N.
d. 90 km; 18 km N.
e. 90 km; 36 km N.


d

Physics & Space Science

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A) 0.15 second ago B) 1 second ago C) 1 minute ago D) 1 hour ago

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Evolution of a star off the main sequence is caused by the loss of mass from hydrogen fusion by the star while a main sequence star

Indicate whether the statement is true or false

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If there are 146 neutrons in 238U, how many neutrons are found in the nucleus of 235U?

a. 141 b. 143 c. 145 d. 147

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Two cylinders are in contact along an inclined plane. The upper cylinder (weight is 2.5W) rests against the lower cylinder (weight W), and both are supported by a wall where the contact force is N1. Assume that all friction forces are negligible. An expression for contact force N1 in terms of load variable W is:

(A) 1.75W
(B) 3.5W
(C) 1.57W
(D) 2.01W

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