How can density be helpful in identifying a pure metal from an alloy?
The density of a pure metal is a definite physical constant. An alloy will have a
slightly different density. A check on melting points will give further evidence.
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A solid sphere, a solid cylinder, a spherical shell, and a hoop all have the same mass and radius. Each are rolling on a horizontal surface with the same center of mass speed, and then they roll up identical inclines. Which one goes the greatest distance up its incline?
a. the hoop b. the solid sphere c. the spherical shell d. the cylinder e. They all go the same distance up their inclines.
Which of the following statements is true about any collision between two objects with no net applied force acting?
a. Momentum is never conserved and kinetic energy is always conserved. b. Momentum is always conserved and kinetic energy is never conserved. c. Momentum is always conserved and kinetic energy is sometimes conserved. d. Momentum is sometimes conserved and kinetic energy is always conserved. e. Momentum and kinetic energy are both always conserved.
A uniform, horizontal beam of length 6.0 m and weight 140 N is attached at one end to a wall by a pin connection (so that it may rotate). A cable attached to the wall above the pin supports the opposite end. The cable makes an angle of 60° with the horizontal. What is the tension in the cable needed to maintain the beam in equilibrium?
a. 81 N c. 70 N b. 69 N d. 140 N
The apparent path that the Sun traces annually along the celestial sphere is known as the ______________
a. parabolic b. elliptic c. ecliptic d. eclipse