Why might we think that silicon would be an obvious alternative to carbon as a building block for biological molecules?
A) it forms the basis of some life forms on Earth
B) it has a similar abundance on Earth to carbon
C) it forms complex molecules like carbon
D) it has a similar electronic structure to carbon, forming a maximum of four bonds and, hence, should have a similar chemistry
D
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A heavy ball hangs by a string, with a second string attached to its bottom. A slow pull on the bottom string breaks the
A) top string. B) bottom string. C) top or bottom string equally.
Which of the following is not a fundamental force?
A. the gravitational force B. the electromagnetic force C. the strong force D. the force of forward motion also known as the inertial force E. Choose this answer if two of the named forces are not fundamental.
The drive chain in a bicycle is exerting a torque of 0.850 N ? m to the wheel of the bicycle. You can treat the wheel as a thin uniform hoop (or ring) with a mass of 0.750 kg and a radius of 33.0 cm. What is the angular acceleration of the wheel?
A) 10.4 rad/s2 B) 20.8 rad/s2 C) 5.20 rad/s2 D) 3.43 rad/s2 E) 1.06 rad/s2
The two rigid objects shown in the figure below have the same mass, radius, and angular speed. If the same braking torque is applied to each, which takes longer to stop?