Which temperature scale never gives negative temperatures?
A) Kelvin
B) Fahrenheit
C) Celsius
A
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Which of the following metals should not be in electrical contact with a critical structure made of low carbon steel that is used in a sea water environment?
(a) Cadmium (b) 2024 aluminum (c) Copper (d) Magnesium
What physical property of Venus is vastly dissimilar compared to Earth?
a. Radius b. Mass c. Density d. Surface temperature
Springs: A very light ideal spring with a spring constant (force constant) of 2.5 N/cm pulls horizontally on an 18-kg box that is resting on a horizontal floor. The coefficient of static friction between the box and the floor is 0.65, and the coefficient of kinetic friction is 0.45.(a) How long is the spring just as the box is ready to move?(b) If the spring pulls the box along with a constant forward velocity of 1.75 m/s, how long is the spring?(c) How long is the spring if it pulls the box forward at a constant 2.75 m/s?
What will be an ideal response?
Projectile Motion: A plane flying horizontally at a speed of 50 m/s and at an elevation of 160 m drops a package, and 2.0 s later it drops a second package. How far apart will the two packages land on the ground if air resistance is negligible?
A. 100 m B. 160 m C. 180 m D. 320 m