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A suspicious-looking man runs as fast as he can along a moving sidewalk from one end to the other, taking 4.00 s. Then security agents appear and the man runs as fast as he can back along the sidewalk to his starting point, taking 9.00 s. What is the ratio of the man's running speed to the sidewalk's speed? (running speed sidewalk speed)
An electron and a proton each have a thermal kinetic energy of 3×kBT/2. Compute the de Broglie wavelength of each particle at the temperature of 2050 K. (kb is Boltzmann's constant, 1.38×10-23 J/K).
you produce an image of the sun on a screen using a thin lens whose focal length is 23.0 cm. what is the diameter of
A 56.0-kg ice skater is moving at 3.94 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. obtain the force exerted by the horizontal rope on her arms
A meterstick (L = 1 m) has a mass of m = 0.133 kg. Initially it hangs from two short strings: one at the 25 cm mark and one at the 75 cm mark. find the tension in the left string right
A dentist uses a mirror to examine a tooth that is 1.25 cm in front of the mirror. The image of the tooth is formed 5.0 cm behind the mirror. Determine the mirror's radius of curvature
A cannon ball is fired from the top of a cliff that is 125 m above the ground. the cannon ball is launched with a velocity of 29.4 m/s at 48 degrees above the horizontal. A) What is the maximum height the cannon ball attains above the ground? B) How ..
Consider a container of 2.0 g of hydrogen, H2 (one mole). What electric force do the protons exert on the electrons after they are separated as described
What are the components of the ships displacement
A charge of +47 uC is located at (0, 2.2 m). A charge of -63 uC islocated at (0, 1.6m). For these questions assume that the electricpotential energies are zero at infinity. What is the electric potential at the orgin? What is the electric field (ma..
A string with a length of 0.7 m is fixed at both ends. What is the longest possible wavelength for the traveling waves that can interfere to form a standing wave on this string
At an instant when a soccer ball is in contact with the foot of the player kicking it, find the magnitude of the net force acting on the soccer ball
A 3.70g bullet moving at 250m/s enters and stops in an initially stationary 3.50kg wooden block on a horizontal frictionless surface, How much work was done in stopping the bullet
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