A student lifts a weight of 10.0 N a distance of 0.500 meters. The energy needed to do this work in calories is (1 cal = 4.186 Joules)
A. 0.570 cal.
B. 0.750 cal.
C. 1.19 cal.
D. 1.75 cal.
E. 2.30 cal.
C. 1.19 cal.
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Power: For the graph shown in the figure, what physical quantity does the slope of the graph represent for a dc circuit?
A. resistivity B. resistance C. energy D. current E. capacitance
Constellations are
What will be an ideal response?
Dr. Smith believes that the Hubble constant is H0 = 70 km/s/Mpc. Dr. Jones believes it is H0 = 50 km/s/Mpc. Which statement below automatically follows?
A) Dr. Smith believes that the universe is expanding, but Dr. Jones does not. B) Dr. Smith believes that the Andromeda Galaxy (a member of our Local Group) is moving away from us at a faster speed than Dr. Jones believes. C) Dr. Smith believes that the universe is older than Dr. Jones believes. D) Dr. Smith believes that the universe is younger than Dr. Jones believes. E) Dr. Smith believes that the universe will someday stop expanding, while Dr. Jones believes it will expand forever.
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the acceleration of the car has components of 2.4 m/s2 east and 1.8 m/s2 south. What is the radius of the circle?
A. 0.24 km B. 0.19 km C. 0.32 km D. 0.14 km E. 0.27 km