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You are standing on the sidewalk as a police car recedes from you at a speed of 20 m/s. What frequencies do you hear from each police car?
A jet airliner moving initially at 300 mi/h due east enters a region where the wind is blowing at 120 mi/h in a direction 31.0° north of east. What is the new velocity of the aircraft relative t
When used to suspend the same object in water, the spring stretches by 0.0520-m. (a) What buoyant force acts on the object? (b) What is the volume of the part of the object that is underwater?
Two identical loudspeakers are driven in phase by a common oscillator at 800 Hz and face each other at a distance of 1.25 m locate the points along the line joining the loudspeakers where relative m
The helicopter with an initial velocity of 15.0 m/s relative to the helicopter, and in a direction opposite the helicopter's motion. Find the initial velocity of the package relative to the ground.
A solid sphere of radius 63 cm has a total positive charge of 19.5 C uniformly distributed throughout its volume. Calculate the magnitude of the electric ?eld at the center of the sphere. Answer in
Four particles, one at each of the four corners of a square with 3.0-m-long edges, are connected by massless rods. The masses of the particles are m1 = m3 = 4.0 kg and m2 = m4 = 5.0 kg. Find the mom
What is the top speed at which they can drive successfully around the curve? The coefficient of static friction between the car's tires and the road is 0.800.
A 17 g rifle bullet traveling 240 m/s buries itself in a 3.4 kg pendulum hanging on a 2.9 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal compon
Use the Heisenberg uncertainty principle to find the lowest possible momentum for the particle and calculate the lowest possible energy for this particle in eV.
Megan's mass is 28 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 3.2 m/s at the bottom of the slide. How much work was done by friction on Megan? Assume that air resistance is
A horizontal pipe contains water at a pressure of 120 flowing with a speed of 1.5 . The pipe narrows to one-half its original diameter. What is the speed and pressure of the water?
An angle of 41.1 with the normal. Part of the light is re?ected and part is refracted. Find the angle between the re?ected and the refracted light.
At what angle should the road bank on the curve so that no frictional force is needed by a vehicle travelling around the curve at the speed limit.
Suppose a rocket launches with an acceleration of 32 m/s2. What is the apparent weight of an 65 kg astronaut aboard this rocket?
A dipole receiving antenna 65.0 cm long is at a location 4.00 mi from the transmitter. Compute the amplitude of the emf that is induced by this signal between the ends of the receiving antenna.
An 18 g rifle bullet traveling 220 m/s buries itself in a 4.0 kg pendulum hanging on a 2.7 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal compo
Decide which hole is located nearest the surface of the water. (b) Calculate the ratio of the radius of the larger hole to the smaller hole.
A particle with charge and momentum , initially moving along the axis, enters a region where a uniform magnetic field extends over a width as shown in the figure. The particle is deflected a distanc
A diving board oscillates with simple harmonic motion of frequency 3.23 cycles per second, see the figure below. What is the maximum amplitude with which the end of the board can vibrate in order t
A 3300kg auto tows a 4500kg trailer. If the engine causes the ground to push the car forward with 8.58kN: What is the acceleration of the horse trailer?
A model rocket rises with constant acceleration to a height of 3.5 , at which point its speed is 28.0. How much time does it take for the rocket to reach this height?
Two identical piano wires have a fundamental frequency of 640 Hz when kept under the same tension. What fractional increase in the tension of one wire will lead to the occurrence of 10 beats/s when
The spring is compressed by x0 =0.31 m relative to its unstrained position at x=0 and then released. What is the speed of the block when the spring is still compressed by xf=0.14m?
A wheel free to rotate about its axis that is not frictionless is initially at rest. A constant external torque of +60 N·m is applied to the wheel for 23 s, giving the wheel an angular veloci