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Two charges repel each other r with a force of 10^ -6N when they are 10 cm apart. When they are brought closer together until they are 2 cm aprt, the force between them becomes:
You are driving north on 107th Avenue at a speed of 29.2 mph. A police car whose siren produces a sound at a frequency of 549 Hz is approaching from the opposite direction at a speed of 55.9 mph. A
You are driving east on 8th Street (Tamiami Trail) at a speed of 27. In the rearview mirror, you see an ambulance approaching at what you estimate to be roughly twice your speed. You hear the siren
A guitar string is tuned to an E4 (that is the standard tune for the thinnest string on a guitar.) If the scale length is 24.4 inches, what is the wave speed on that string?
The mass and volume of an American penny made after 1982 are 2.5 g and 0.36 cm3. How many pennies can be placed in the racquetball boat without sinking it? (The density of water is 1000 kg/m3.)
Light is incident of the surface of metallic sodium, whose work function is 2.3 eV. The maximum speed of the photoelectrons emitted by the surface is 3.00 × 106 m/s. What is the wavelength of
A particle lives for a short time before breaking apart into otherparticles. Suppose it is moving at a speed of 0.972c, and an observer who is stationaryin a laboratory measures the particle's life
A uniform rectangular plate is hanging vertically downward from a hinge that passes along its left edge. By blowing air at 9.70 m/s over the top of the plate only, it is possible to keep the plate i
Assume that the speed of the water in the reservoir is zero, and that the water flow is steady. Ignore both air resistance and the height difference between the reservoir and the muzzle.
A coil of Nichrome wire is 27.0 m long. The wire has a diameter of 0.390 mm and is at 20.0°C. (a) If it carries a current of 0.560 A, what is the magnitude of the electric field in the wire?
A long straight wire carries a current of 46 A. An electron, traveling at 1.0 x 107 m/s, is 6.0 cm from the wire. What is the magnitude of the magnetic force on the electron if the electron velocity
Find the minimum diameter of an l = 19.3 m long steel wire that will stretch no more than 8.20 mm when a mass of 304 kg is hung on the lower end. (Hint: The Young's modulus of steel is 200.0 GPa.)
A block of mass ‘m' is suspended from the ceiling of a stationary standing elevator through a spring of spring constant ‘k'. Suddenly the cable breaks and the elevator starts falling fre
One afternoon I was sitting on a bench in the park when a boy went running by me and then lept into a swingset that was just hanging there at rest. I noticed when this happened the swingset swung ab
At how many points does the listener observe destructive interference? The listener and the speakers are all in the same horizontal plane and the speed of sound is 340 m/s. [Hint: Start with determi
What is the spacing between the first- order bright fringe and the second order dark fringe? How many total bright fringes are seen on the screen?
An RL circuit in which the inductance is L = 4.00 H and the resistance is R = 5.00 omegacap.gif is connected to a 21.0 V battery at t = 0. (a) What energy is stored in the inductor when the current
(a) What does this person hear, constructive or destructive interference? Why? (b) They now walk towards one of the speakers. How far from the center must they walk before they first hear the sound
The magnitude of the magnetic field varies in the time according to the expression B=.0100t+.0400t^2, where t is in seconds and B in telsas. Calculate the magnitude of the induced emf in the coil at
The distance from particle A to B is 0.500 and the distance from particle B to C is 0.250. Find the magnitude and direction of the net gravitational force acting on each of the three particles (let
The 23 kg cylinder in Problem 15.97 is released from the position shown and falls onto a nonlinear spring. In terms of the spring stretch, S, the potential energy of the spring is given by V = 0.5kS
A mass attached to a spring oscillates horizontally on a frictionless table with a position given by: Drawing a complete blank on how to find period of oscillation. (i) What is the amplitude of the os
The solubility of a gas in water depends on: (a) nature of the gas (b), The solubility of a gas in water depends on: (a) Nature of the gas (b) Temperature (c) Pressure of the gas (d) All of the above
A spring with a spring constant of 120 N/m lies on a horizontal frictionless table. The spring is attached to a 1.5-kg mass, which is pulled 0.25 m from equilibrium and released. (i) What is the ini