A hydraulic lift raises a 2000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm2, what is the cross-sectional area of the larger piston?
a. 40 cm2
b. 80 cm2
c. 196 cm2
d. 392 cm2
e. 160 cm2
d
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A Young's double-slit apparatus is set up so that a screen is positioned 2.1 m from the double slits, and the spacing between the two slits is 0.033 mm. What is the distance between alternating bright fringes on the screen if the light source has a wavelength of 678 nm? (1 nm = 10?9 m)
a. 3.0E–4 m b. 4.3E–2 m c. 2.1E–2 m d. 4.7E–2 m e. 1.1E–2 m
A proton falls through a potential drop of 400 V. How much is the change of potential energy of this proton in falling through this potential drop?
A) 6.4 × 10-16 J B) -6.4 × 10-16 J C) 17 × 10-16 J D) -4000 J E) 4000 J
Helium gas has the special property that its thermal energy is directly proportional to its Kelvin temperature. Consider a flask of helium with a temperature of 10°C
If it is heated until it has twice as much thermal energy, show that its temperature is 293°C. Why would doubling the thermal energy of a flask of 10°C water not produce the same temperature? What will be an ideal response?
Equal but opposite charges Q are placed on the square plates of an air-filled parallel-plate capacitor. The plates are then pulled apart to twice their original separation, which is small compared to the dimensions of the plates
Which of the following statements about this capacitor are true? (There may be more than one correct choice.) A) The capacitance has doubled. B) The electric field between the plates has increased. C) The energy stored in the capacitor has doubled. D) The energy density in the capacitor has increased. E) The potential difference across the plates has doubled.