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Visible light is incident on a sodium surface in a photoelectric effect experiment. (a) Given the wavelength of visible light is from 380 to 730 nm and the work function of sodium is 2.28 eV,
One travels at 4.01 cm/s and the other at 3.99999 cm/s. When the first one crosses the finish line, how far behind is the second one?
The object to be photographed is 3.89 m in front of the objective lens. How far behind the concave lens should the film be placed?
The water exerts a force of 240 N east. If the boat (including crew) has a mass of 320 kg, what are the magnitude and direction of its acceleration?
Assume that the origin goes through the A particle. The three masses are connected by massless, rigid rods of 50 cm length (center-to-center). If the mass of A is 250 g, the mass of B is 150 g and
You are driving home from school steadily at 100 km/h for 150 km. It then begins to rain and you slow to 61 km/h. You arrive home after driving 3 hours and 40 minutes. How far is your hometown from
Two identical point charges (q = +6.90 x 10-6 C) are fixed at opposite corners of a square whose sides have a length of 0.450 m. A test charge (q0 = -3.20 x 10-8 C), with a mass of 5.20 x 10-8 kg,
A cardinal (Richmondena cardinalis) of mass 3.90×10-2 and a baseball of mass 0.144 have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of t
During a collision, an 84 kilogram driver of a car moving at 24 meters per second is brought to rest by an inflating air bag in 1.2 seconds. What is the approximate magnitude of the force exerted on
Two children ride on the merry-go-round. Child 1 is 2.0 {rm m} from the axis of rotation, and child 2 is 1.5 {rm m} from the axis. If the merry-go-round completes one revolution every 5.2 s, find t
Two stationary point charges, charge 1 of magnitude 3.45 nC and charge 2 of magnitude 1.60 nC, are separated by a distance of 41.0 cm. An electron is released from rest at the point midway between t
What is the magnitude of the apparent weight of a 83 astronaut 4600 from the center of the Earth's Moon in a space vehicle moving at constant velocity?
At a football game, a stationary spectator is watching the halftime show. A trumpet player in the band is playing a 784-Hz tone while marching directly toward the spectator at a speed of 3.50 m/s.
A motorcycle is traveling up one side of a hill and down the other side. The crest of the hill is a circular arc with a radius of 61.0 m. Determine the maximum speed that the cycle can have while mo
Two submarines are underwater and approaching each other head-on. Sub A has a speed of 7 m/s and sub B has a speed of 17 m/s. Sub A sends out a 1250 Hz sonar wave that travels at a speed of 1522 m/
Take the magnitude of free-fall acceleration to be 9.80 . Ignore air resistance.A flea jumps straight up to a maximum height of 0.490 . What is its initial velocity as it leaves the ground?
the range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 32°C.
Now suppose the friction is sufficient to keep the car from skidding. Calculate the magnitude of the normal force exerted on the car by the road's surface.
A car initially traveling at 25.9 m/s undergoes a constant negative acceleration of magnitude 1.60 m/s2 after it brakes are applied. How many revolutions does each tire make before the car comes to
You drive on Interstate 10 from San Antonio to Houston, half the time at 56 km/h and the other half at 94 km/h. On the way back you travel half the distance at 56 km/h and the other half at 94 km/h.
A uniform soda can of mass 0.136 kg is 12.2 cm tall and filled with 1.26 kg of soda. Then small holes are drilled in the top and bottom (with negligible loss of metal) to drain the soda. What is the
An elevator car of mass 835 kg falls from rest 3.30 m, hits a buffer spring, and then travels an additional 0.430 m, as it compresses the spring by a maximum of 0.430 m. What is the force constant
A horse canters away from its trainer in a straight line, moving 119 m away in 13 s. It then turns abruptly and gallops halfway back in 4.0 s. Calculate its average speed in m/s.
Consider a too-small space station that consists of a 2.7 m radius rotating sphere. A man standing inside is 1.9 m tall and his feet are at 1 g. What is the acceleration of his head?
A cube of ice is taken from the freezer at -7.5°C and placed in a 104 g aluminum calorimeter filled with 294 g of water at room temperature of 20°C. The final situation is observed to be al