A child bounces a 50-gram superball on the sidewalk. The velocity of the superball changes from 21 m/s downward to 19 m/s upward. If the contact time with the sidewalk is 1/800 s, what is the magnitude of the force exerted on the superball by the sidewalk?
1 600 N
Physics & Space Science
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Significant Figures: Add the following lengths, each obtained from a different measuring instrument, and round the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m.
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
Why would anyone be interested in mining material from an asteroid?
What will be an ideal response?
Physics & Space Science
A 4-mol ideal gas system undergoes an adiabatic process where it expands and does 28 J of work on its environment. How much heat is received by the system?
a. -20 J c. +28 J b. zero d. +7 J
Physics & Space Science
A race car goes around a curve at 50 m/s. The radius of the curve is 400 m. What is the car's acceleration?
Physics & Space Science