A 7.0-?C charge is placed at the origin and a second charge is placed on the x-axis at x = 0.3 m. If the resulting force on the second charge is 6.9 N in the positive x-direction, what is the force on the charge at the origin?
a. 6.9 N in the positive x-direction
b. 6.9 N in the negative x-direction
c. 0 N
d. not able to be determined until the second charge is known
e. 6.9 N in the negative y-direction
b
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Lens-Maker Formula: A double convex lens has faces with radii of magnitudes 18.0 cm and 20.0 cm. When an object is placed 24.0 cm in front of the lens, a real image is formed 32.0 cm from the lens.(a) What is the focal length of this lens?(b) What is the index of refraction of the material from which the lens is made?
Fill in the blank(s) with the appropriate word(s).
How can the Doppler method be used to estimate the average orbital distance of a planet's orbit?
A) by measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity B) by measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law C) by measuring the asymmetries in the velocity curve D) by measuring the amount by which the starlight is reduced when the planet transits
Of the main types of radiation emitted from naturally radioactive isotopes, which of the following is the most penetrating?
a. alpha b. beta (electron) c. gamma d. beta (positron)
A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ b. ?0.29 kJ c. +30 J d. ?30 J e. ?50 J