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The Hβ line of hydrogen corresponds to a wavelength of 486.133 nm when measured in a lab on Earth. In observations of the star Megrez in Ursa Major, the absorption line for Hβ is observed
If the electric field at the surface of the sphere is 750 {rm{ kN/C}} and points outward, what is the charge of the point charge? What is the field just inside the shell?
After driving past the factory, the driver hears frequency ff. What is the change in frequency ff - fi heard by the driver?
The intensity of a cylindrical laser beam is 0.800 {rm W}/{rm m}^{2}. The cross-sectional area of the beam is 3.0 times 10^{ - 4} {rm m}^{2}. What is the average power output of the laser?
A staging that weighs 380 N supports two painters, one 140 N and the other 500 N. The reading in the left scale is Fl = 610 N .What is the reading Fr in the right hand scale?
Calculate the elastic potential energy of the spring (take it to be zero for the unstretched spring), the kinetic energy of the cat, the gravitational potential energy of the system relative to the
A 75 kg human sprinter can accelerate from rest to 12 m/s in 3.3 s. During the same interval, a 33 kg greyhound can accelerate from rest to 20 m/s. Compute (a) the change in kinetic energy and (b)
Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs 41.0 N. Determine the force that the table exerts on the box if the weight hanging o
He and his friend are watching TV and the clock chime give times it is 5:00 pm. Elmer's eyes start to water. Which of the following is the ucs in this story.
What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20°C? Hint: Assume the air bubble is always in thermal equilibrium with the surrounding w
Ignoring the container and the equilibrium vapor pressure of the liquid at 40.3 °C, find the ratio of the mass of steam to the mass of ice. The specific heat capacity of steam is 2020 J/(kg C&de
A 84-kg lumberjack stands at one end of a 423-kg floating log, as shown in the figure. Both the log and the lumberjack are at rest initially. If the lumberjack now trots toward the other end of the
A 68 person sits on a 3.6 chair. Each leg of the chair makes contact with the floor in a circle that is 1.2 in diameter. Find the pressure exerted on the floor by each leg of the chair, assuming th
A ranger in a national park is driving at 46 km/h when a deer jumps onto the road 64 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce a deceleration of
How much time would it take for her to emit a net radiant energy from her body that is equal to the energy contained in this dessert?
If the speed of the child at the lowest position is 2.21972 m/s, what is the mechanical energy dissipated by the various resistive forces (e.g. friction, etc.)?
Two identical diverging lenses are separated by 14 cm. The focal length of each lens is -8.0 cm. An object is located 4.0 cm to the left of the lens that is on the left. Determine the final image d
Stan does 159 J of work lifting himself 0.1 m. What is Stan's mass? The acceleration of gravity is 9.8 m/s2 .
A horizontal circular wire loop of radius 0.6 m lies in a plane perpendicular to a uniform magnetic ?eld pointing from above into the plane of the loop, has a magnitude of 0.57 T. If in 0.12 s the
An attack helicopter is equipped with a 20- mm cannon that fires 57 g shells in the forward direction with a muzzle speed of 1130 m/s. The fully loaded helicopter has a mass of 3490 kg. A burst of 2
When identical amounts of heat are supplied to each, the glass bar reaches a temperature of 96 °C, while the other bar reaches 257.0 °C. What is the specific heat capacity of the other subst
A 59-kg woman and a 73-kg man sit on a seesaw, 3.5 m long. Where is their center of mass? Neglect the mass of the seesaw.
The coefficient of friction between the skis and the snow is 0.16. After the skier had been moving for 5.0 s, the friction of the snow suddenly increased and made the net force on the skier zero. Wh
A projectile is fired at an upward angle of 45° from the top of a 279 m cliff with a speed of 204 m/s. What will be its speed when it strikes the ground below? (Use conservation of energy.)
At 1.15s after liftoff, the rocket clears the top of its launch platform, 63m above the ground. After an additional 4.75s it is 1.00km above the ground. calculate the magnitude of the average veloci