9. Work & Energy
Intro to Energy & Kinetic Energy
9. Work & Energy
Intro to Energy & Kinetic Energy
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- Multiple Choice
About 50,000 years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona. Some estimates suggest this meteor had a mass of about 1.4×108 kg and released 1×1016 J of energy when it slammed into the Earth. Calculate the approximate speed of this meteor before impact.
3140views76rank1comments - Multiple ChoiceA particle with mass m and velocity v has kinetic energy K. What is the kinetic energy of a particle with mass m/2 and velocity 2v?616views
- Multiple ChoiceBlock A has mass and block B has mass . Starting from rest, the two blocks are pushed by identical forces through a distance of . Which block (if either) is going faster at end of the ? Which block (if either) has the greatest kinetic energy at the end of the ?450views
- Multiple ChoiceWhat is the kinetic energy of a car traveling at (about )?421views
- Textbook Question
(II) For a satellite of mass in a circular orbit of radius r_S around the Earth, determine
(a) its kinetic energy K
301views - Textbook Question(c) Is it reasonable that a 30-kg child could run fast enough to have 100 J of kinetic energy?615views
- Textbook Question
(I) At room temperature, an oxygen molecule, with mass of 5.31 x 10⁻²⁶ kg, typically has a kinetic energy of about 6.21 x 10⁻²¹ J . How fast is it moving?
263views - Textbook QuestionA mother has four times the mass of her young son. Both are running with the same kinetic energy. What is the ratio v(son)/v(mother) of their speeds?779views