What is the magnitude of the electrostatic force between a singly charged sodium ion
What is the magnitude of the electrostatic force between a singly charged sodium ion (Na^+, of charge +e) and an adjacent singly charged chlorine ion (Cl^-, of charge -e) in a salt crystal if their separation is 2.82 x 10^-10 m?
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A vertical container with base area measuring 14.0 cm by
17.0 cm is being filled with identical pieces of candy, each with a
volume of 50.0 mm^3 and a mass of 0.0200 g. Assume that the volume
of the empty spaces between the candies is negligible. If the height
of the candies in the container increases at the rate of 0.250 cm/s, at
what rate (kilograms per minute) does the mass of the candies in
the container increase?
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If two firecrackers produce a combined sound level of 85 dB when fired simultaneously at a certain place, what will be the sound level if only one is exploded? [Hint: Add intensities, not dBs.]
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The figure (a) shows two charged particles fixed in place on an x axis with separation L. The ratio q1/q2 of their charge magnitudes is 4.00. Figure (b) shows the x component Enet,x of their net electric field along the x axis just to the right of particle 2. The x axis scale is set by x_s = 30.0 cm. (a) At what value of x (greater than) 0 is Enet,x maximum? (b) If particle 2 has charge -q2 = -3e, what is the value of that maximum?
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Planet A and planet B are in circular orbits around a distant star. Planet A is 7.0 times farther from the star than is planet B. What is the ratio of their speeds v_A / v_B?
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Time standards are now based on atomic clocks. A promising
second standard is based on pulsars, which are rotating neutron
stars (highly compact stars consisting only of neutrons).
Some rotate at a rate that is highly stable, sending out a radio
beacon that sweeps briefly across Earth once with each rotation,
like a lighthouse beacon. Pulsar PSR 1937 + 21 is an example; it
rotates once every 1.557 806 448 872 75 +/- 3 ms, where the trailing
+/-3 indicates the uncertainty in the last decimal place (it does not
mean +/-3 ms). (a) How many rotations does PSR 1937 + 21 make
in 7.00 days? (b) How much time does the pulsar take to rotate exactly
one million times and (c) what is the associated uncertainty?
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A uniform magnetic field of magnitude 0.50 T is directed perpendicular to the plane of a rectangular loop having dimensions 8.0 cm by 12 cm. Find the magnetic flux through the loop.
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Estimate how long it would take one person to mow a football field using an ordinary home lawn mower (Fig. 1–15). (State your assumption, such as the mower moves with a 1-kmh speed, and has a 0.5-m width.)
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A block with a weight of 3.0 N is at rest on a horizontal surface. A 1.0 N upward force is applied to the block by means of an attached vertical string. What are the (a) magnitude and (b) direction of the force of the block on the horizontal surface?
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