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A patient is going to be prescribed bifocals which will be 2.00 cm from the eye. The prescribed powers (in diopters) for the bifocals are +0.80 and -1.60, and these bifocals give the patient normal
A patient has a far point of 39.5 cm and a near point of 21.4 cm. A.) What power (in diopters) should be prescribed to correct the patient's vision using a contact lens?
Grass clippings are found to have an average length of 3.8cm when a lawn is moved 10 days after the previous mowing. What is the average speed of growth of this grass in cm/days?
A block with a weight of 3.5 N is at rest on a horizontal surface. A 1.2 N upward force is applied to the block by means of attached vertical string. (a) What is the magnitude of the force of the bl
The cannon exerted an average force of 1000 Newtons on the ball during launch. Now that the ball is in the air and has almost reached its target, what is the magnitude of the net force acting on the
After flying for 15 min in a wind blowing 42 km/h at an angle of 28° south of east, an airplane pilot is over a town that is 46 km due north of the starting point. What is the speed of the airp
A cylindrical container 1.39 m tall contains mercury to a certain depth d. The rest of the cylinder is filled with water. If the pressure at the bottom of the cylinder is two atmospheres, what is th
A -10.0 nC point charge and a +20.0 nC point charge are 14.9 cm apart on the x-axis. Part A. What is the electric potential at the point on the x-axis where the electric field is zero?
Sketch the electric field in the interior and the exterior of a spherical metal shell 6 cm in radius if the shell has a net charge of +10-8 Coulombs on its surface. Find the surface charge density o
A length of aluminum wire has a resistance of 20.0 ? at 14.0°C. When the wire is warmed in an oven and reaches thermal equilibrium, the resistance of the wire increases to 36.2 (a) Neglec
Two trains face each other on adjacent tracks. They are initially at rest, and their front ends are 36 m apart. The train on the left accelerates rightward at 1.1 m/s2. The train on the right accele
A spherical shell of a Van de Graff generator has an electric field strength E = -10000 N/C on the surface of its spherical shell R=10 cm in radius.
A thermodynamic system undergoes a process in which its internal energy decreases by 510 J. If at the same time 210 J of work is done on the system, find the energy transferred to or from it by hea
When the ball lands, it is at the same level as the tee. On the distant planet, what is the maximum height of the ball??
A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.10 m/s and her body makes an angle of 81.0° with respect to the hor
The electrons pass through a hole in the second plate and impact on a tungsten target to create the X-rays. A) what is the electric field in the gap between the plates?
A Styrofoam cup holding 116 g of hot water at 1.00 102°C cools to room temperature, 16.1°C. What is the change in entropy of the room? (Neglect the specific heat of the cup and any change in
How far would the line stretch? How long would it take a beam of light to travel from one end to the other of the line of atoms?
Show the three processes on a pV diagram. Compute the temperature during the isothermal compression. Compute the maximum pressure.
A freezer is used to freeze 3.0 L of water completely into ice. The water and the freezer remain at a constant temperature of T = 0°C. (a) Determine the change in the entropy of the water.
A nonconducting thin layer carries charge with a uniform density of 8.30 µC/cm2. a(a) What is the electric field 8.55 cm in front of the wall if 8.55 cm is small compared with the dimensions o
A proton is located at the origin, and a second proton is located on the x-axis at x = 6.82 fm (1 fm = 10-15 m). (a) Calculate the electric potential energy associated with this configuration.
(a) Write an expression for U as a function of x, with U in joules and x in meters. (b) What is the maximum positive potential energy?
A 9.0 µF capacitor is charged by a 11.0 V battery through a resistance R. The capacitor reaches a potential difference of 4.00 V at a time 3.00 s after charging begins. Find R. Please show the