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9. Work & Energy

Intro to Energy & Kinetic Energy

9. Work & Energy

Intro to Energy & Kinetic Energy

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.
Multiple Choice
A 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?
Multiple Choice
Block A has mass $20 kg$ and block B has mass $50 kg$ . Starting from rest, the two blocks are pushed by identical forces through a distance of $10 m$ . Which block (if either) is going faster at end of the $10 m$ ? Which block (if either) has the greatest kinetic energy at the end of the $10 m$ ?
Multiple Choice
What is the kinetic energy of a $500 kg$ car traveling at $27 m / s$ (about $60 mph$ )?
Open Question
(II) For a satellite of mass in a circular orbit of radius r_S around the Earth, determine
(a) its kinetic energy K
Open Question
(c) Is it reasonable that a 30-kg child could run fast enough to have 100 J of kinetic energy?
Open 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?