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A 10-kg box is stationary on the ground and pushed by a downward force of 30 N. Calculate the supporting normal force acted on the box from the ground
An electron is released from rest at x=0 in a region where the electric field is <5.0X10^3 N/C, 0, 0>. Find the speed of the electron when x = 2.5 cm
A photographer uses a lens with f = 50mm to form an image of a distant object on the CCD detector in a digital camera, What is the height of the image now
On a workday the average decibel level of a busy street is 71 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 40 every minute on a weekend
A stone is thrown from the top of a cliff 150 m above the ground, What is the speed (magnitude of velocity) of the stone when it hits the ground
A telephoto lens with focal length of 120mm has f-numbers ranging from f/2.8 to f/22, What is the diameter of the lens aperture at f/2.8? in millimeters
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it, What is the power of one laser pulse
Find the maximum weight for the car if the springs should be compressed no more than 4.2 cm when the car is at rest
Two parallel plates, each of area 7.00 cm^2, are seperated by 3.50 mm of water, What is the magnitude of the potential difference between the plates
A circular plastic disk of radius R, carrying a surface charge density? = ks, is rotating at constant angular velocity, Find the magnetic moment of the rotating disk
Assume a dampening depth, d, of 30 cm and a period, lambda, of 24 hours (8.64 x 104 sec). Assume a volumetric heat capacity, C, of 0.5 cal/cm °C, find the thermal diffusivity and conductivity
A 15-microF capacitor is connected to a 50-V battery and becomes fully charged, what is the voltage across the capacitor's plates after the slab is inserted
A 150-kg (including all the contents) rocket has an engine that produces a constant vertical force (the thrust) of 1680 N, Find the acceleration of the rocket
A narrow beam of light with wavelengths from 450 nm to 700 nm is incident perpendicular to one face of a 32.00, What is the angular spread of the beam after passing through the prism
If the coefficient of static friction is 0.500, what minimum force magnitude is required from the rope to start the crate moving
The distance between the objective and eyepiece lenses in a microscope is 24cm, What eyepiece focal length will give the microscope an overall angular magnification of 350
A camera takes a perfectly exposed picture when the lens diaphragm is set to f/4 and the shutter speed is 1/250 s, what should the new shutter speed be so that the exposure is still correct
A cubical box with sides of length a#consists of five metal plates which are welded together and grounded, Find the potential everywhere inside the box
A student has built a 20-cm-long pinhole camera for a science fair project. She wants to photograph the Washington Monument, How far should she stand from the Washington Monument
Camera A has a lens with an aperture diameter of 8.30mm, What exposure time should be used with camera B in photographing the same object with the same film if this camera has a lens with an apertur
At a distance of 1.41 m from a point charge of +2.74 ?C, how many of the additional equipotential surfaces are crossed by the time the electric field has shrunk to one-half of its initial value
A motorcycle starts with a constant acceleration of 3.0 m/s^2. At just that instant a buick with a constant speed of 20 m/s passes the motorcycle, How fast is the motorcycle travelling when it overt
The record distance in the sport of throwing cowpats is 81.1 m. This record toss was set by Steve Urner of the United States in 1981, Determine the initial speed of the projectile