In a hydraulic garage lift, the small piston has a radius of 5.0 cm and the large piston has a radius of 15 cm
What force must be applied on the small piston in order to lift a car weighing 20,000 N on the large piston? Assume the pistons each have negligible weight. A) 6.7 × 103 N
B) 5.0 × 103 N
C) 2.9 × 103 N
D) 2.2 × 103 N
D
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Which of the following best explains why a solar day is longer than a sidereal day?
A) Because Earth orbits the Sun at the same time it rotates, Earth must make slightly more than one full rotation between noon one day and noon the next. B) The precession of Earth's axis gradually changes the length of the solar day while leaving the length of the sidereal day alone. C) The fact that Earth's orbit is not a perfect circle causes the length of the solar day to vary during the year, so that it the solar day is sometimes longer and sometimes shorter than a sidereal day. D) The Sun rotates much as the Earth does, but more slowly, so that a solar day is longer than a sidereal day.
A charge of uniform density (0.80 nC/m) is distributed along the x axis from the origin to the point x = 10 cm. What is the electric potential (relative to zero at infinity) at a point, x = 18 cm, on the x axis?
a. 7.1 V b. 5.8 V c. 9.0 V d. 13 V e. 16 V
A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting effects of air, when the package hits the ground the horizontal location of the plane will
A) be behind the package. B) be directly over the package. C) be in front of the package. D) depend on the speed of the plane when the package was released.
The electrical force between charges is strongest when the charges are
A) close together. B) far apart. C) either of these D) need more information