A car is traveling along a highway at 65 mph. What is the linear speed of the top of the tires?
What will be an ideal response?
130 mph
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When we consider a thin horizontal layer of the atmosphere, of thickness dy, of area A, with pressure P on the bottom, with an average mass m per molecule, and nV molecules per unit volume, the magnitude of the difference of the pressure at the top and bottom of the layer is given by dP =
A. mgdy. B. mgnVdy. C. mgAdy. D. mgnVAdy. E. mgnVAPdy.
A large telescope of mass 8410 kg is in a circular orbit around the earth, making one revolution every 927 minutes. What is the magnitude of the gravitational force exerted on the satellite by the earth?
(G = 6.67 × 10-11 N ? m2/kg2, Mearth = 6.0 × 1024 kg)
To be more efficient, the temperature difference should be
A as small as possible B. as large as possible C. It doesn't matter.
A lens is made with a focal length of -40 cm using a material with index of refraction 1.50. A second lens is made with the SAME GEOMETRY as the first lens, but using a material having refractive index of 2.00
What is the focal length of the second lens? A) -80 cm B) -53 cm C) -30 cm D) -20 cm E) -40 cm