A race car circles 10 times around an 8-km track in 20 min. What is its average speed per lap?
What will be an ideal response?
Average lap speed is 70 m/s.
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Copernicus's heliocentric model failed to work as well as it might fail to predict the positions of planets because Copernicus insisted the orbits were
A. circular, mounted on epicycles. B. circular. C. elliptical. D. hyperbolic.
Coastal winds that shift from night to day illustrate
A) conduction. B) convection. C) radiation. D) all about equally
The inside of a house is at 20°C on an early morning when the temperature outside is 15°C. The next morning the inside temperature is the same but the outside temperature is now 10°C. How much does the energy per unit time lost by conduction through the walls, windows, doors, etc., change for the house from the first morning to the second one?
a. Since the inside temperature stays the same, the loss is the same both days. b. The loss doubles. c. The loss halves. d. The loss increases by 5/288 since we need to use the Kelvin scale for this calculation.
A baseball outfielder throws a baseball of mass 0.15 kg at a speed of 30 m/s and initial angle of 30°. What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction
a. zero c. 92 J b. 51 J d. 120 J