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A radio controlled car transmitter produces a 240 milliWatt signal. The car will work if the received signal is at least 20 microWatts/meter^2. Determine the maximum distance you can drive the car a
Two workers hold a heavy pail. Its mass is unknown. One worker exerts a 220N force at 137 degrees from vertical. The other worker exerts a 170N force. What is the weight of the pail?
Find the amount of time it takes for the target mass (m = 1kg) to raise its temperature by 100K if the current of the beam is I = 20µA. Note that the specific heat of iron is c = 500J/kg K, an
If k = 50 N/m, m = 0.50 kg, d = 10 cm, and the coefficient of kinetic friction between the block and the horizontal surface is equal to 0.25, determine the speed of the block when it first passes th
A cart of mass 2.3 kg is moving with a velocity of 15.2 m/s. It makes a head-on perfectly inelastic collision with a stationary cart B with mass 8.1 kg causing them to travel with a velocity 10.94 m
A very massive object traveling at 100 m/s in the +z direction strikes a very light object that is initially at rest. If the collision is totally elastic, what is the velocity of the heavier object?
Clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. What is the minimum rotational frequency in rpm, for which t
She is at rest relative to the spacecraft just before catching the 2.9 kg book. Find the astronaunts velocity just after she catches the book.
A pendulum with a lenght of L=2.00m is pulled back to an angle of 30 degrees as is then released. What is the maximum velocity of the pendulum bob?
An electron moves in a circular path perpendicular to a constant magnetic field with a magnitude of 2.50 mT. The angular momentum of the electron about the center of the circle is 3.00 x 10-25 J&mi
Calculate the change in the total kinetic energy of the system that occurs during the collision.
What is the approximate yield strength of a copper silica alloy which has spherical precipitates of silica of average radius 100 nm. The volume fraction of silica is 1%, the shear modulus is 4.2 &ti
A copper crystal has a homogeneous dislocation density of 10^10 m-2. what is the approximate elastic strain energy of a screw dislocation per metre.
The energy of formation of a vacancy in copper is 1eV. what is approximate relative change in the density of copper due to vacancy formation at a temperature just below its melting point (1356K)
When a dislocation passes right through a crystal slip equal to a lattice spacing occurs. Estimate the number of dislocations on the (111) plane which would be needed to produce 5% plastic deformati
The paint particles in the mist are polarized and as such are attracted to the charged chassis.
Assume that the rod has a slightly flattened bottom so that it slides instead of rolling. Use 9.80 for the magnitude of the acceleration due to gravity. Find, the coefficient of static friction betw
Consider light that is refracted by a prism shaped like an equilateral triangle. The incident ray is parallel with the prism's base. What is the total deflection of the ray, given that the index of
What are the charge density and total charge on each plate? Draw the equipotential surfaces at 0.10 V and 0.20 V.
(a) What is the electric force exerted on an electron when it is 3.0 x 10^-15 m from the center of the nucleus? (b) What is the acceleration of the electron at this point?
A 2.0µF capacitor and a 4.0µF capacitor are connected in series across 1000 V. The charged capacitors are then disconnected from the source and connected to each other with terminals of
A 85-turn circular coil has diameter 4.3cm and resistance 2.9O. This coil is placed inside a solenoid, with coil and solenoid axes aligned. The solenoid has 5000 turns of wire and is 21cm long. Par
A 1.2 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction of an x axis is applied to the block. The force is given by F(x) = (2.5 -
a) what is the average acceleration of the bullet thru the board? b) what is the total time the bullet is in contact with the board? c) What thickness of the board would it take to stop the bullet,