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Solving Basic Physics Problems

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1) If you do 100 J of work to elevate a bucket of water, what is its gravitational energy relative to its starting position?
2) Suppose two blocks of ice are heading towards each other. Block A has a mass of 4.24 kg and is traveling at 2.24 m/s. Block B has a mass of 4.42 kg and is traveling at 2.24 m/s in the opposite direction. After the collision, they are traveling in the same direction and at the same speed. What is the speed they are traveling at?
3) An object has a mass of 8.14 kg and is moving at 5.11 m/s. How much kinetic energy does it have?
4) Two cars have a head-on collision. Both were traveling at 42 m/s toward each other. Car A has a mass of 558 kg. Car B has a mass of 868 kg. After impact, car A is moving backward at 3 m/s. What is car B's velocity after impact?
5) Mrs. Jacobs drops an object from 10 meters. She knows it did 47 Joules of work. What was the mass of the object?
6) Which requires more work? Lifting a 10 kg load a vertical distance of 2 meters or lifting a 5 kg load a distance of 4 meters?

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Solution Summary

The solution assists with answering basic physics problems.

Solution provided by:
Changping Wang, MA
Education
  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
  • "excellent work"
  • "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
  • "Thank you"
  • "Thank you very much for your valuable time and assistance!"
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