A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces exerted on this crate must point
A) down the ramp.
B) up the ramp.
C) perpendicular to the ramp.
D) vertically downward.
E) None of the above choices is correct.
E
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The rotation curve of a galaxy can be used to determine
a. the relative number of hot young stars in the galaxy. b. the relative amount of gas and dust in the galaxy. c. the radius of the galaxy. d. the luminosity of the galaxy. e. the mass of the galaxy.
In the lab, a relativistic proton has a momentum of 1.00 × 10-19 kg ? m/s and a rest energy of 0.150 nJ. What is the speed of the proton in the lab? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 0.170c B) 0.196c C) 0.911c D) 0.930c E) 0.951c
An object moves with a constant speed of 30 m/s on a circular track of radius 150 m. What is the acceleration of the object?
A) 0 m/s2 B) 0.17 m/s2 C) 5.0 m/s2 D) 6.0 m/s2
From the 1930s to the 1970s, extensive groundwater pumping in the San Joaquin Valley of California caused the ground to subside by as much as 9 m. How does groundwater withdrawal contribute to land subsidence?
What will be an ideal response?