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A molecule of DNA (deoxyribonucleic acid) is 2.16 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring a
John is listening to a horn. He knows the frequency of the horn is 516.402 Hz when both he and the horn are at rest. If John hears the horn's pitch at 549.402 Hz, which of the following are possible
What are the pressure and velocity of the water in the tip? What is the speed of the water just outside of the tip of the fire house? I did this incorrectly, I think maybe I started right because he
What is the magnitude and direction of the velocity of the blocks after the collision? To the left or to the right?
A pulley having a rotational inertia of 1.0x10^4 g/cm^2 and a radius of 10 cm is acted upon by a force applied tangentially at its rim that varies in time as F=0.50t + 0.3t^2, where F is in Newton's
A fuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predetermined value. Suppose that the material to be used in a fuse melts whe
Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 8.10 cm-3 and their speed is about 490 km/s. (a) Find the current density of these protons. A/m2 (b) If E
An electric doorbell requires a 12V, 60 Hz ac supply. (a) What turn ratio is required on a transformer to operate from a 120 V, 60 Hz ac supply? (b) Is this a step-up or step-down transformer? (c) I
Microwaves of wavelength 5.0 cm enter a long narrow window in a building.. If the window is 35.0 cm wide, what is the distance from the central maximum to the first-order minimum along a wall 7.5 m
In an Atwood machine, one block has a mass of M1 = 560 g and the other has a mass of M2 = 460 g. The pulley, which is mounted in horizontal frictionless bearings, has a radius of 5.0cm and a mass of
A light ray of wavelength 550 nm initially in water enters a transparent substance at an angle of 37 degrees with respect to the normal and the transmitted ray is refracted at an angle of 25 degrees
Two converging lenses having focal lengths of 5.0 cm and 10.0 cm are located 21.0 cm apart. An object is placed 15.0 cm in front of the 5.0-cm lens. (a). Determine the final location of the image. (
White light spans the wavelength range between about 400 nm and 760 nm. If white light passes through two slits 0.25 nm apart and falls on a screen 2.0 m from the slits, find the distance between t
A metal cylinder, which has length L and a resistance of 4 Ohms, is melted down to form a new cylinder with twice the length but the same density and mass. What is the new cylinder's resistance in O
A converging lens of focal length 15 cm forms an image of an object placed (a) 30 cm, (b) 15 cm, (c) 5 cm from the lens. Find the image distance and magnification for each AND describe the image (re
Concept Simulation 25.2 illustrates the concepts pertinent to this problem. A 2.80-cm-high object is situated 14.6 cm in front of a concave mirror that has a radius of curvature of 9.27 cm. Calcula
What velocity would a proton need to circle Earth 1300 km above the magnetic equator, where Earth's magnetic field is directed horizontally north and has a magnitude of 4.00 multiplied by 10-8 T?
A 1.5 V battery is connected to a 3 Ohm light bulb (assume resistance remains constant). The battery is rated to be able to supply 9,000 Joules of energy at a constant current. Approximately how man
Illustrate the refraction of a light ray from a medium of higher speed to a medium of lower speed. Label each of the following: incident ray, refracted ray, angle of incidence, angle of refraction,
Illustrate with a diagram and develop Brewster's Law from Snell's law. (use air as one medium) At what angle of incidence will unpolarized light from the Sun become completely polarized upon reflect
The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. (b) Calculate the work done by the man on the piano. (c) Calculate the work done by the friction fo
An electric field of 1.64 kV/m and a magnetic field of 0.495 T act on a moving electron to produce no net force. If the fields are perpendicular to each other, what is the electron's speed?
If the magnetic field has a magnitude of 308 µT and is in the positive x direction, find the (a)x, (b)y, and (c)z components of the electric field. Give your answers in V/m