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The bright springtime star Regulas has its wavelength of maximum energy intensity located at 250 x 10^-9 meters. What is the temperature of Regulas? What is the approximate spectral type of Regulus?
Two ice skaters, Daniel (mass 70.0 kg) and Rebecca (mass 45.0kg), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 13.0m/s before she collides with him.
A fire helicopter carries a 649 kg bucket of water at the end of a 18.7 m long cable. Flying back from a fire at a constant speed of 44.2 m/s, Determine the force of air resistance on the bucket
A 73.6 kg weight-watcher wishes to climb a mountain to work off the equivalent of a large piece of chocolate cake rated at 514 (food) Calories. How high must the person climb
A 190 g ball moving at 0.45 m/s in the + x- direction is subject to a 0.15 N force in the - y- direction for 2.5 s. Find the magnitude of the ball's momentum change
A square loop of wire surrounds a solenoid. The side of the square is 0.1 m, while the radius of the solenoid is 0.025 m. What is the current flowing in the square loop
The coefficient of static friction among the floor of a truck and a box resting on it is 0.26. The truck is traveling at 84.1 km/hr. What is the least distance in which the truck can stop and ensure that the box does not slide?
A 70 pF capacitor and a 280 pF capacitor are both charged to 3.6 kV. They are then disconnected from the voltage source and are connected together, Find the energy lost when the connections are made
A 100-g bullet is fired from a rifle having a barrel 0.600 m long. Determine the work done by the gas on the bullet
At a certain point in a pipeline the liquid speed is 8 m/s and the gauge pressure is 7x10^4 Pa. Find the gauge pressure at the second point at a level 10 meters lower than at the first if a cross-sectional area is 10cm squared at the first point a..
A pulley with a radius of 10.0 cm is mounted on an axle that passes through the center of the pulley. calculate the instantaneous angular speed of the pulley
A certain loudspeaker system emits sound isotropically with a frequency of 2270 Hz and an intensity of 1.05 mW/m2 at a distance of 5.26 m. Assume that there are no reflections
An electron is suspended in a vacuum between two oppo- sitely charged horizontal parallel plates. What is the voltage across the plates
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