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You're carrying a 3.4-m-long, 20 pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 from its tip.
What is the energy of a photon that has the same wavelength asa 12-eV electron? (h=6.63 x 10-34 J * s)
Calculate how thick an absorber needs to be to absorb 75% of the incoming light using the lambert-beer law for absorption. how is the small gain coefficient k of a laser defined in relation to the
While a roofer is working on a roof that slants at 42.0above the horizontal, he accidentally nudges his 93.0 toolbox, causing it to start sliding downward, starting from rest.
A motorcyclist is able to ride on the vertical wall of a bowl-shaped track as shown. his weight is counteracted by the friction of the wall on the tires ( vertical arrow ). is it centripetal or cen
The water, what angle (in degrees) does the boat velocity make with the shore? How long does it take the boat to reach the child?
A microscope has a length of 32.0 cm, an eyepiece with a focal length of 4.8 cm, and an objective lens with a focal length of 0.5 cm. (Assum the observer's near point distance is 25 cm and that the
Consider a conical pendulum with an 80kg bob on a 10m wire making an angle of 50degree with the vertical. Determine the radial acceleration of the bob
A car is driven 110 km west and then 75 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?
A 715 newton man rides a roller coaster and is at the very bottom of an upward circular of radius 55.0 m. If he is moving 15.0 m/s at this point, what does he feel his weight to be (net force)?
A 0.23 kg mass is initially at rest and is free to move with negligible friction along the x axis. The ?gure below shows the value of an applied force as a function of time.
Once you get on the walkway, you immediately turn around and start walking in the opposite direction with a speed of 1.5 m/s relative to the walkway?
Earthquakes are essentially sound waves travelling through the earth. They are called seismic waves. Because the earth is solid, it can support both longitudinal and transverse sismic waves, which t
A Venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at speed v2 through a horizontal section of pipe whose cross-sectional area is A2 = 0.05
Determine the magnitude of the magnetic field in the region through which the current passes.
A block is hung on a spring, and the frequency f of the oscillation of the system is measured. The block, a secondidentical block, and the spring are carried in the Space Shuttle to space. The two blo
How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on?
The following data were obtained for a voltage measurement, in mV, on a noisy
If the airplane somehow continues to fly as if nothing happend, where is the engine relative to the airplane at the moment the engine hits the ground?
The screen is located 10.3 cm from the center of the coils and is 54.2 cm wide. When the field is turned off, the electron beam hits the center of the screen. Ignoring relativistic corrections, what
A parallel -plate capacitor has circular plates of 8.2cm radius and 1.3cm separation. A. calculate the capacitance
An outfielder throws a 0.150 kg baseball at a speed of 50.0 m/s and an initial angle of 30.0°. What is the kinetic energy of the ball at the highest point of its motion?
24.0% of the weight of the car. What is the acceleration of the car? How many meters does the car travel before stopping under these conditions?
A bicycle has wheels with a 30-centimeter radius. If smaller wheels with a 25-centimeter radius are installed, What is the change in linear speed of the bicycle if the wheels rotate at 1 revolution
Which of the following is the best example of kinetic energy?