An electric car is designed to run off a bank of 12-V batteries with total energy storage of 6.0 × 10^7 J. If the electric motor draws 6000 W in moving the car at a steady speed of 10 m/s, how far will the car go before it is "out of juice?"
a. 150 km
c. 100 km
b. 50 km
d. 25 km
C
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Pressure in a Liquid: A container has a vertical tube, whose inner radius is 12.00 mm, connected to it at its side, as shown in the figure. An unknown liquid reaches level A in the container and level B in the tube-level A being 5.0 cm higher than level B. The liquid supports a 20-cm high column of oil, between levels B and C, whose density is 320 kg/m3. The gauge pressure at level B is closest to
A. 630 Pa. B. 310 Pa. C. 470 Pa. D. 790 Pa. E. 940 Pa.
The spectral sequence sorts stars according to
A) mass. B) surface temperature. C) luminosity. D) core temperature. E) radius.
It would be easier to pull evacuated Magdeburg hemispheres apart if they were
A) held upside down. B) at sea level. C) 2 km beneath the ocean surface. D) 2 km above the ocean surface. E) none of the above
A toy rocket, launched from the ground, rises vertically with an acceleration of 20 m/s2 for 6.0 s until its motor stops. Disregarding any air resistance, what maximum height above the ground will the rocket achieve?
a. 1.1 km b. 0.73 km c. 1.9 km d. 0.39 km e. 1.5 km