(a) A dentist uses a small mirror of radius 40 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 19 mm from the tooth, what is the magnification of the image? (b) A production line inspector wants a mirror that produces an upright image with magnification of...
An AC generator with an output rms voltage of 42 V at a frequency of 60 Hz is connected across a 9 F capacitor. Find the following. (a) capacitive reactance (b) rms current A (c) maximum current in the circuit 3 A (d) When does the capacitor have its maximum charge? 4 1/3 cycle...
A collapsible plastic bag (Fig. P9.19) contains a glucose solution. If the average gauge pressure in the vein is 1.34 104 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein? Assume that the specific gravity of the solution is 1.05.
The drawing shows two long, straight wires that are suspended from a ceiling. The mass per unit length of each wire is 0.050 kg/m. Each of the four strings suspending the wires has a length of 1.2 m. When the wires carry identical currents in opposite directions, the angle between the strings...
From the scattering of sunlight, Thomson found that the classical radius of the elec- tron is 2.82 10 15 m. If sunlight with an intensity of 470 W/m2 falls on a disk with this radius, estimate the time required to ac- cumulate 1.0 eV of energy. Assume that light is a classical wave and that...
A system consists of four balls of mass m at a distance of mass m at a distance of 1m from the center, and is rotating at a frequency of 2 rev/s. A.) If all the spokes are suddenly shortened to .5m what is the new frequency of the system? B.) Is the kinetic energy conserved for the system?...
A small ball is attached to one end of a spring that has an unstrained length of 0.216 m. The spring is held by the other end, and the ball is whirled around in a horizontal circle at a speed of 3.30 m/s. The spring remains nearly parallel to the ground during the motion and is observed to...
eview Conceptual example 6 as background for this problem. When electrons pass through a single slit, as in the figure, they form a diffraction pattern. As Section 29.6 discusses, the central bright fringe extends to either side of the midpoint, according to an angle given by the following...
Pulling down on a rope, you lift a 4.43 kg bucket of water from a well with an acceleration of 1.55 m/s2. What is the tension in the rope?
Old naval ships fired 11 kg cannon balls from a 200 kg cannon. It was very important to stop the recoil of the cannon, since otherwise the heavy cannon would go careening across the deck of the ship. In one design, a large spring with spring constant 2.5 104 N/m was placed behind the cannon. The...
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1. Can you show me step by step how to solve this problem?:
- The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
- (a) What is the average angular acceleration of the Earth?
- (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?
- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas