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At a distance of 20m from a source of sound, the sound level is 40 dB. what will the sound level be
One gallon of gasoline contains 3.1 multiply.gif 107 calories of potential energy that are released during combustion. what is the average force produced by the gasoline
Radar at an airport tells an air traffic controller that a light airplane is approaching at 220 km/h at 33° north of east. Instruments also tell the air traffic controller that there is a wi
Two projectiles are launched from a cliff of height H = 16m as shown in the diagram below. Projectile 1 is launched with velocity v1 = 12 m/s at an angle q1, where q1 = 35 degrees. Projectile 2 is
2. The Horseshoe Falls on the Canadian side of Niagara Falls have water that moves horizontally at 9.0 m/s which then falls 53 m vertically into the Niagara River below. Ignoring any air resistanc
The density of water is about 1000 kg/m3 and the density of air is about 1 kg/m3.
A transformer has 100 turns in its primary windings and 500 turns in its secondary winding. calculate the secondary voltage and current
A centrifuge whose maximum rotation rate is 11,000 rev/min can be brought to rest in 3.00 s. What is the average angular acceleration of the centrifuge
A -19 mC charge experiences a force of 60 N directed south. What is the electric field magnitude and direction at the location of the charge
A lens forms an image of an object. The object is 16.0 cm from the lens. is it erect or inverted
After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. what is the age of the ancient site
A compound microscope has an objective lens with a 2.2 cm focal length and an eyepiece with a 5.4 cm focal length. what magnification does the microscope produce
An object is viewed through a 35 cm thick tank of water (n=1.33) at an angle of 30 degrees from parallel to the tank surface. what is the apparent displacement the object from its actual location
The hydrogen alpha emission spectra has a 658.28 nanometer wavelength. What is the red-shifted wavelength of hydrogen alpha light from the bootes galaxy cluster
A convex lens with a 10-cm focal length is in front of a concave lens with a 10-cm focal length. The lenses are separated by 40 cm. Where is the final image with respect to the convex lens
The moon is 3.85Ã-10^8 m from Earth, and it takes 27.3 days to orbit Earth. At what speed is the moon traveling relative to Earth
A 2.0 kg ball moving with a speed of 3.0 m/s hits, elastically, an identical stationary ball as shown. find the speed and direction of the second ball after the collision
Three solid spheres of lead, each of mass 9.8 kg, are located at three corners of a square with side lengths of 50 cm. determine the magnitude and direction of the acceleration of the smaller object w
A solution has a hydronium-ion concentration of 1.0 x 10^-3 mol per liter. What is the hydroxide-ion concentration of this solution
Assume that a 16 volt energy source is in a circuit that has a resistance of 10 ohms. Determine the current and power
An isotope of the element Thallium, Tl-206, undergoes beta decay with a half life of 3.1 minutes. what mass of the isotope will be left after 9.3 minutes have elapsed
A 900 kg car travelling east at 15 m/s collides with 750 kg travelling north at 20 m/s. what is the speed of the wreckage
A uniform 210N ladder rests against a perfectly smooth wall, making a 40.0 degrees angle with the wall. Find the normal forces that the wall exert on the ladder
Two people are carrying a uniform wooden board that is 3.40m long and weighs 145N. What force does the other person lift
A 720 gram grinding wheel 30.0cm in diameter is in the shape of a uniform solid disk. What torque does friction exert while this wheel is slowing down