Is more work required to increase a car's speed from rest to 30 mph, or from 50 mph to 60 mph?
What will be an ideal response?
50 to 60 mph
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Angular Momentum: Three solid, uniform, cylindrical flywheels, each of mass 65.0 kg and radius 1.47 m, rotate independently around a common axis through their centers. Two of the flywheels rotate in one direction at 8.94 rad/s, but the other one rotates in the opposite direction at 3.42 rad/s. Calculate the magnitude of the net angular momentum of the system.
A. 1020 kg ? m2/s B. 1500 kg ? m2/s C. 975 kg ? m2/s D. 940 kg ? m2/s
If a lens is submerged in water, what happens to its focal length?
A) It decreases. B) It stays the same. C) It becomes negative. D) It increases.
In a bicycle, the pedals drive the chainwheel, which is connected by means of a chain to the cogwheel, a small wheel attached to the rear wheel
In a certain bicycle, the radius of the chainwheel is 12.0 cm, the radius of the cogwheel is 4.0 cm, and the radius of the rear wheel is 66.0 cm. At what rate should the cyclist be pedaling in order for the bicycle to have a forward speed of 10.0 m/s? A) 48.2 rpm B) 16.1 rpm C) 12.1 rpm D) 24.1 rpm E) 60.3 rpm
Which of the following best describes the mobile-first strategy?
A. Creating a separate mobile website version. B. Mobile-first is synonymous with RWD. C. Designing for mobile users, rather than desktop or laptop users. D. Creating a low-bandwidth or nongraphical website.