A quarterback of mass 85 kg is running at 10 m/s. Also, a tackle of mass 100 kg is running at 9 m/s.
A. The tackle has the greater kinetic energy
B. The quarterback has the greater kinetic energy
C. The quarterback and the tackle have equal kinetic energies
Answer: B
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Suppose reaction A involves the making of bonds and 44.5 J of energy, reaction B involves the making of bonds and 17.3 J of energy, and reaction C involves the breaking of bonds and 12.5 J of energy
What is the overall A + B + C reaction energy? Is this an exothermic or an endothermic reaction? Explain.
In freezing a saturated liquid, where would you expect conduction heat transfer to be greater, in the saturated solid or the saturated liquid? Is this true for water at normal pressures?
What will be an ideal response?
A projectile is shot from the edge of a vertical cliff 60.0 m above the ocean. It has a speed of 100 m/s and is fired at an angle of 35.0° above the horizontal. How far from the foot of the vertical cliff does the projectile hit the water?
A) 126 m B) 312 m C) 684 m D) 1080 m E) 540 m
Waves on a String: The speed of sound in steel is 5000 m/s. What is the wavelength of a sound wave of frequency 660 Hz in steel?
A. 7.58 m B. 2.41 m C. 1.21 m D. 0.829 m E. 0.132 m