Significant Figures: Add the following lengths, each obtained from a different measuring instrument, and round the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m.
Fill in the blank(s) with the appropriate word(s).
28.41 m
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A pencil balanced on its tip such that it does not move
A) is in unstable equilibrium. B) is in stable equilibrium. C) has a net torque acting on it. D) has a net vertical force. E) has a zero moment of inertia.
Which statement about asteroids is not true?
A) If we could put all the asteroids together, they would make an object about the size of Earth. B) Many but not all orbit the Sun in the asteroid belt. C) Some are more like loosely bound piles of rubble than solid chunks of rock. D) Most asteroids are not spherical in shape.
What is the maximum length of a metal cable that can hang vertically supported from one end of the cable?
The Young's modulus of this metal is 2.10 × 1011 N/m2, its tensile strength (the maximum tensile stress it can support without breaking) is 7.40 × 108 N/m2, and its density is 7.60 × 103 kg/m3. A) 9.94 km B) 4.22 km C) 456 km D) 1.75 km E) 24.8 km
The surface temperature of the Sun can be measured using ________.
A. Bode's rule B. the Doppler shift C. Wien's law D. Kepler's third law