An automobile travels at an unchanging speed of 80 km/hr on a straight level road. Which of the following best represents the overall energy process occurring here?
A) Chem E ? Kin E B) Thermal E ? Chem E
C) Chem E ? Thermal E D) Kin E ? Chem E
C
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A skater is using very low-friction rollerblades. A friend throws a Frisbee at her, on the straight line along which she is coasting. Describe the following event as an elastic, an inelastic, or a perfectly inelastic collision between the skater and the Frisbee. She catches the Frisbee and immediately throws it back with the same speed (relative to the ground) to her friend
1.elastic 2.inelastic 3.perfectly inelastic
Which two energy sources can help a star maintain its internal thermal pressure?
A) nuclear fusion and gravitational contraction B) nuclear fission and gravitational contraction C) nuclear fusion and nuclear fission D) chemical reactions and gravitational contraction E) nuclear fusion and chemical reactions
Work: A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4.0 m above the ground. What is the mass of the box?
A. 8.9 kg B. 5.3 kg C. 6.7 kg D. 8.0 kg
If an atom has 104 electrons, 157 neutrons, and 104 protons, what is its approximate atomic mass?
A) The approximate atomic mass is 365. B) The approximate atomic mass is 261. C) The approximate atomic mass is 157. D) The approximate atomic mass is cannot be determined with the information given.